CN111833810A - Display panel driving method and device and display panel - Google Patents

Display panel driving method and device and display panel Download PDF

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Publication number
CN111833810A
CN111833810A CN202010746064.1A CN202010746064A CN111833810A CN 111833810 A CN111833810 A CN 111833810A CN 202010746064 A CN202010746064 A CN 202010746064A CN 111833810 A CN111833810 A CN 111833810A
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pixel
color sub
brightness
gray scale
preset
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CN111833810B (en
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高宇
刘孟宇
黄智�
夏景成
刘俊哲
李田田
孙佳欣
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Yungu Guan Technology Co Ltd
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Yungu Guan Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours

Abstract

The embodiment of the invention discloses a display panel driving method, a display panel driving device and a display panel, wherein the driving method comprises the following steps: calculating preset brightness respectively corresponding to different color sub-pixels in the display panel under the preset gray scale according to the white light brightness under the preset gray scale and the brightness ratio of the different color sub-pixels; determining target brightness and target driving voltage corresponding to a second color sub-pixel under a preset gray scale at least according to the driving voltage of the first color sub-pixel emitting preset monochromatic light under the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel; and writing a target data voltage corresponding to the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel in a black insertion stage in one frame. The embodiment of the invention can reduce the problem that other color sub-pixels are stolen to be lighted when the first color sub-pixel is lighted, so that the display effect is not influenced, and the color cast problem of the display panel is favorably improved.

Description

Display panel driving method and device and display panel
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a driving method and device thereof.
Background
With the continuous development of display technology, Organic Light Emitting Diode (OLED) display panels have been widely used in the field of photoelectric display by virtue of their excellent characteristics of self-luminescence, high brightness, wide viewing angle, etc.
The OLED display panel usually includes red, green, and blue sub-pixels, and in the prior art, due to differences in energy bands of the three colors, when a sub-pixel of one color is lit at a specific gray level, sub-pixels of other colors are also lit to cause crosstalk, thereby causing a color shift problem of the display panel.
Disclosure of Invention
The embodiment of the invention provides a display panel driving method and device and a display panel, and aims to solve the problem of color cast of the display panel.
In a first aspect, an embodiment of the present invention provides a method for driving a display panel, including:
calculating preset brightness respectively corresponding to different color sub-pixels in the display panel under a preset gray scale according to the white light brightness under the preset gray scale and the brightness ratio of the different color sub-pixels;
determining target brightness and target driving voltage corresponding to a second color sub-pixel under the preset gray scale at least according to the driving voltage of the first color sub-pixel emitting preset monochromatic light under the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel;
writing a target data voltage corresponding to the target driving voltage into a pixel driving circuit corresponding to the second color sub-pixel in a black insertion stage in one frame, so that the second color sub-pixel emits light according to the target data voltage in a light emitting stage in one frame;
wherein the second color sub-pixel comprises at least one color sub-pixel in the display panel except the first color sub-pixel.
Optionally, a time ratio of a black insertion period in the frame is inversely related to a luminance ratio, where the luminance ratio is a ratio of the preset luminance corresponding to the second color sub-pixel to the target luminance.
Optionally, the black insertion phase comprises a first black insertion sub-phase before the light emission phase;
the writing a target data voltage corresponding to the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel in the black insertion stage in one frame so that the second color sub-pixel emits light according to the target data voltage in the light emitting stage in one frame includes:
writing the target driving voltage into a pixel driving circuit corresponding to the second color sub-pixel in the first black insertion sub-stage in one frame so as to enable the second color sub-pixel to emit light according to the target data voltage in the light emitting stage in one frame;
preferably, the black insertion phase further comprises a second black insertion sub-phase after the light emission phase.
Optionally, the second color sub-pixels include other color sub-pixels in the display panel except for the first color sub-pixels.
Optionally, the lighting voltage of the first color sub-pixel is greater than the lighting voltage of the second color sub-pixel.
Optionally, the calculating, according to the luminance of the white light at the preset gray scale and the luminance ratios of the different color sub-pixels, the preset luminances of the different color sub-pixels in the display panel respectively corresponding to the preset gray scale includes:
calculating first brightness respectively corresponding to different color sub-pixels in the display panel under a preset gray scale according to the white light brightness under the preset gray scale and the brightness ratio of the different color sub-pixels;
calculating preset brightness respectively corresponding to the sub-pixels with different colors under the preset gray scale according to the first brightness and the screen body parameters;
the screen body parameters comprise screen body opening rates corresponding to the sub-pixels with different colors and transmittance of a screen body polaroid;
preferably, a ratio of the first brightness to the preset brightness is equal to a product of the aperture ratio of the screen body and the transmittance of the polarizer.
Optionally, the determining, at least according to a driving voltage of a first color sub-pixel emitting preset monochromatic light at the preset gray scale and a common layer resistance of the first color sub-pixel and a second color sub-pixel, a target brightness and a corresponding target driving voltage of the second color sub-pixel at the preset gray scale includes:
determining the target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale according to the driving voltage of the first color sub-pixel which emits the preset monochromatic light under the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel, and specifically comprising the following steps:
determining crosstalk current according to the corresponding driving voltage of the first color sub-pixel under the preset gray scale, the relation between the driving voltage and the current of the second color sub-pixel and the common layer resistance of the first color sub-pixel and the second color sub-pixel;
determining the real current flowing through the second color sub-pixel according to the crosstalk current and the corresponding preset current of the second color sub-pixel under the preset gray scale;
and determining the target brightness corresponding to the second color sub-pixel under the preset gray scale according to the corresponding relation between the real current and the current and brightness corresponding to the second color sub-pixel, and determining the target driving voltage corresponding to the second color sub-pixel under the preset gray scale according to the relation between the brightness corresponding to the second color sub-pixel and the driving voltage.
Optionally, before determining, at least according to a driving voltage of a first color sub-pixel emitting preset monochromatic light at the preset gray scale and a common layer resistance of the first color sub-pixel and a second color sub-pixel, a corresponding target brightness and a corresponding target driving voltage of the second color sub-pixel at the preset gray scale, the method further includes:
acquiring the target crosstalk intensity of the preset monochromatic light under a preset gray scale;
the determining of the target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale according to the driving voltage of the first color sub-pixel emitting the preset monochromatic light under the preset gray scale comprises:
determining the corresponding target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale according to the driving voltage of the first color sub-pixel emitting the preset monochromatic light under the preset gray scale, the common layer resistance of the first color sub-pixel and the second color sub-pixel and the target crosstalk intensity, and specifically comprising:
determining crosstalk brightness of the second color sub-pixel according to the target crosstalk intensity;
determining crosstalk current according to a driving voltage corresponding to the first color sub-pixel under the preset gray scale, a crosstalk driving voltage corresponding to crosstalk brightness of the second color sub-pixel and common layer resistance of the first color sub-pixel and the second color sub-pixel;
determining the real current flowing through the second color sub-pixel according to the crosstalk current and the corresponding preset current of the second color sub-pixel under the preset gray scale;
and determining the target brightness corresponding to the second color sub-pixel under the preset gray scale according to the corresponding relation between the real current and the current and brightness corresponding to the second color sub-pixel, and determining the target driving voltage corresponding to the second color sub-pixel under the preset gray scale according to the relation between the brightness corresponding to the second color sub-pixel and the driving voltage.
In a second aspect, an embodiment of the present invention further provides a driving apparatus for a display panel, including:
the preset brightness calculation module is used for calculating the preset brightness of the sub-pixels with different colors in the display panel respectively corresponding to the preset gray scale according to the white light brightness and the sub-pixel proportion with different colors in the preset gray scale;
the target brightness and target driving voltage calculation module is used for determining the corresponding target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale at least according to the driving voltage of the first color sub-pixel which emits the preset monochromatic light under the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel;
and the driving module is used for writing a target data voltage corresponding to the target drive into the pixel driving circuit corresponding to the second color sub-pixel in a black insertion stage in one frame so as to enable the second color sub-pixel to emit light according to the target data voltage in a light emitting stage in one frame.
In a third aspect, an embodiment of the present invention further provides a display panel, which is driven by the driving method of the display panel according to the first aspect.
The embodiment of the invention provides a display panel driving method, a display panel driving device and a display panel.A preset brightness corresponding to different color sub-pixels in the display panel under a preset gray scale is calculated according to a white light brightness under the preset gray scale and a brightness ratio of the different color sub-pixels, and then a target brightness corresponding to a second color sub-pixel under the preset gray scale and a target driving voltage corresponding to the second color sub-pixel are determined at least according to a driving voltage of the first color sub-pixel emitting preset monochromatic light under the preset gray scale and a common layer resistance of the first color sub-pixel and the second color sub-pixel; and writing a target data voltage corresponding to the target driving voltage into a pixel driving circuit corresponding to the second color sub-pixel at a black insertion stage in one frame, wherein crosstalk between the first color sub-pixel and the second color sub-pixel is caused by a current flowing through the common layer, in the embodiment of the present invention, the second color sub-pixel is calculated according to at least a driving voltage of the first color sub-pixel at a preset gray scale and a common layer resistance of the first color sub-pixel and the second color sub-pixel, namely, the crosstalk caused by the common layer resistance is taken into consideration, so that it is ensured that the target luminance and the target data voltage of the second color sub-pixel at the preset gray scale can be beneficial to reducing crosstalk between different color sub-pixels, thereby being beneficial to improving a color shift phenomenon, and by writing the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel, the voltage difference between the sub-pixels of each color under the preset gray scale is reduced, the problem of electric leakage crosstalk between the sub-pixels of each color is further reduced, and when the light emitted by the sub-pixels of each color is matched into white light, the color coordinate offset of the white light is favorably improved.
Drawings
FIG. 1 is a diagram of a blue crosstalk spectrum under a predetermined gray scale in the prior art;
fig. 2 is a flowchart of a driving method of a display panel according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating another driving method for a display panel according to an embodiment of the present invention;
FIG. 5 is a graph of current versus brightness according to an embodiment of the present invention;
FIG. 6 is a graph of voltage versus luminance according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating another driving method for a display panel according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating another driving method for a display panel according to an embodiment of the present invention;
fig. 9 is a flowchart of a method for calculating a target luminance and a target driving voltage according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a driving apparatus of a display panel 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 limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Because the light emitted by each color sub-pixel in the display panel under the high gray scale is not easy to generate crosstalk, and the identification capability of human eyes on the uniformity of the brightness of the display picture under the high gray scale is limited, people pay more attention to the color cast phenomenon of the display picture under the low gray scale. As described in the background art, the conventional display panel has a color shift phenomenon when a specific gray scale is lit, especially a low gray scale, resulting in a poor display effect. The reasons for this are as follows: the energy bands of the red, green and blue sub-pixels are different, so that the lighting voltages of the sub-pixels of the three colors are different, when the sub-pixel with higher lighting voltage is lighted at a low gray scale, the current flows from the common layer to the sub-pixels of other colors due to the influence of crosstalk current, the sub-pixel with the lower lighting voltage can also be lighted, and the crosstalk of the light emitted by the sub-pixel with the higher lighting voltage has the light emitted by the sub-pixel with the lower lighting voltage, so that the coordinate of the monochromatic light appears when the OLED display panel is lighted at the low gray scale, the coordinate of the white light when the light with different colors is matched with the white light is shifted, and the color of the white light under the low gray scale is shifted. Illustratively, the blue sub-pixel generally has the highest lighting voltage, and the red sub-pixel has the lowest lighting voltage. When the blue sub-pixel is lit at a low gray scale, the red sub-pixel is also lit due to the presence of the crosstalk current, thereby causing crosstalk of red light in the blue light, and the larger the difference in the firing voltages between the different color sub-pixels, the more severe the crosstalk. Fig. 1 is a graph of a crosstalk spectrum of blue light at a preset gray level in the prior art, and fig. 1 exemplarily shows a crosstalk spectrum of red light in the blue light, wherein the blue light has a shorter wavelength, the red light has a longer wavelength, and the green light has a wavelength between the red light and the blue light. Referring to fig. 1, the abscissa is the wavelength of the monochromatic light, and the ordinate is the normalized value of the occupancy of the monochromatic light, and at a preset gray level (e.g., 16 gray levels), there are 30% red light and 17% green light in the blue light as crosstalk.
In view of the above, embodiments of the present invention provide a method and an apparatus for driving a display panel, and a display panel, in which preset luminances corresponding to different color sub-pixels in the display panel respectively at a preset gray scale are calculated according to a luminance of white light at the preset gray scale and luminance ratios of the different color sub-pixels, and then a target luminance corresponding to a second color sub-pixel at the preset gray scale and a target driving voltage corresponding to the second color sub-pixel are determined at least according to a driving voltage of the first color sub-pixel emitting preset monochromatic light at the preset gray scale and a common layer resistance of the first color sub-pixel and the second color sub-pixel; and writing a target data voltage corresponding to the target driving voltage into a pixel driving circuit corresponding to the second color sub-pixel in a black insertion stage in one frame, wherein crosstalk between the first color sub-pixel and the second color sub-pixel is caused by a current flowing through a common layer In the driving circuit, the voltage difference between the sub-pixels of each color under the preset gray scale is reduced, so that the problem of electric leakage crosstalk between the sub-pixels of each color is reduced, and when the light emitted by the sub-pixels of each color is matched into white light, the color coordinate offset of the white light is favorably improved.
The above is the core idea of the present invention, and the following will clearly and completely describe the technical solution in the embodiment of the present invention with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 2 is a flowchart of a driving method of a display panel according to an embodiment of the present invention, and referring to fig. 2, the driving method includes:
s110, respectively corresponding preset brightness of the sub-pixels with different colors in the display panel under the preset gray scale is calculated according to the white light brightness under the preset gray scale and the brightness ratio of the sub-pixels with different colors.
Specifically, the white light can be formed by the light with different colors according to a certain brightness ratio for picture display, and the brightness of the white light and the brightness of the monochromatic light under different gray scales are different, so that the preset brightness of the sub-pixels with different colors can be calculated according to the brightness ratio of the light emitted by the sub-pixels with different colors to the white light under a specific gray scale, wherein the brightness ratio of the sub-pixels with different colors can be calculated by a color coordinate matrix.
And S120, determining the corresponding target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale at least according to the driving voltage of the first color sub-pixel emitting the preset monochromatic light under the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel.
Specifically, the second color sub-pixel includes at least one color sub-pixel in the display panel except for the first color sub-pixel, and the target brightness of the second color sub-pixel corresponding to the preset gray scale means that the first color sub-pixel and the second color sub-pixel are lighted up under the preset gray scale, and the light emitted by the second color sub-pixel can reduce the brightness corresponding to the second color sub-pixel when crosstalk is caused by the existence of the common layer resistance; the target driving voltage is a driving voltage (working voltage at two ends of the light emitting device) corresponding to the target brightness of the second color sub-pixel at the preset gray scale. That is to say, under the preset gray scale, the luminance of the second color sub-pixel under the target driving voltage is the target luminance, and when the luminance corresponding to the second color sub-pixel is the target luminance, the target luminance of the second color sub-pixel under the preset gray scale and the target data voltage can be ensured to be favorable for reducing crosstalk between different color sub-pixels, that is, crosstalk of light emitted by the second color sub-pixel in the preset monochromatic light emitted by the first color sub-pixel does not affect the display effect.
Crosstalk is a phenomenon that when a sub-pixel corresponding to a certain monochromatic light is lit, sub-pixels corresponding to other colors of light are lit at the same time due to different lighting voltages of the sub-pixels with different colors, so that other colors of light are crosstalked in the monochromatic light, that is, when the sub-pixel corresponding to the monochromatic light is lit, sub-pixels corresponding to other colors of light are stolen and lit, so that a deviation occurs in a color coordinate of the monochromatic light, and finally a color coordinate of the white light is shifted. The reason why the crosstalk occurs is that the lighting voltages corresponding to the sub-pixels of different colors are different, and when the sub-pixel with higher lighting voltage is lighted in a low gray scale, the current flows from the common current to the sub-pixels of other colors due to the influence of the crosstalk current, and the sub-pixel with the lower lighting voltage can also be lighted, so that the light emitted by the sub-pixel with lower lighting voltage is crosstalk among the light emitted by the sub-pixel with higher lighting voltage. Fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 3, the display panel includes a substrate 11, a first electrode 12 located on the substrate 11, a hole injection layer 13 located between a hole transport layer 14 and the first electrode 12 and located on a side of the first electrode 12 away from the substrate 11, a light emitting layer 15 located on a side of the hole transport layer 14 away from the substrate 11, and an electron injection layer 17 located between an electron transport layer 16 and a second electrode 18 and located on a layer of the light emitting layer 15 away from the substrate 11. Among them, the common layer of any embodiment of the present invention may include at least one of the hole injection layer 13, the hole transport layer 14, the electron injection layer 17, and the electron transport layer 16.
Optionally, the second color sub-pixels include other color sub-pixels in the display panel besides the first color sub-pixels. Before the display of the display panel, a current-voltage-brightness curve test (IVL test) can be performed on the sub-pixels corresponding to each color in the display panel, and the driving voltage and current corresponding to each monochromatic light at any brightness can be obtained from the IVL test curve. Illustratively, the display panel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, the first color sub-pixel is a blue sub-pixel emitting blue light, the second color sub-pixel may be a red sub-pixel emitting red light, and the second color sub-pixel may also be a green sub-pixel emitting green light. For example, when the first color sub-pixel is a blue sub-pixel emitting blue light and the second color sub-pixel is a red sub-pixel emitting red light, assuming that the preset gray scale is 16 gray scales, the luminance of the first color sub-pixel is B1 at 16 gray scales, and the driving voltage is Vblue; according to the method for calculating the target brightness, the target brightness corresponding to the second color sub-pixel under the 16 gray scale is Rrel, and the target driving voltage Vmr corresponding to the second color sub-pixel under the target brightness Rrel can be obtained from the red light IVL test curve, that is, under the 16 gray scale, when the target brightness corresponding to the second color sub-pixel is Rrel and the corresponding target driving voltage is Vmr, the target brightness and the target data voltage of the second color sub-pixel under the preset gray scale can be ensured to be beneficial to reducing crosstalk between different color sub-pixels.
S130, writing a target data voltage corresponding to the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel during the black insertion stage in one frame, so that the second color sub-pixel emits light according to the target data voltage during the light emitting stage in one frame.
Specifically, the display panel displays the images frame by frame, each sub-pixel corresponds to a pixel driving circuit, and the pixel driving circuit is used for driving the light-emitting device to emit light. The pixel circuit comprises a driving transistor and a data voltage writing module, wherein in a black insertion stage in one frame, the data voltage writing module writes a target data voltage corresponding to the target driving voltage into a grid electrode of the driving transistor corresponding to the second color sub-pixel, and the target driving voltage corresponding to the second color sub-pixel can be obtained by calculation according to the driving voltage of the first color sub-pixel under a preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel. For example, after calculating the target driving voltage of the second color sub-pixel at the preset gray scale according to at least the driving voltage of the first color sub-pixel at the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel, determining a target driving current according to an IVL test curve between the target driving current and the target driving voltage, calculating a target data voltage according to a formula between the target driving current and the target data voltage (for example, obtaining the target data voltage from the target driving current according to a calculation formula of the current of the driving transistor in the saturation region in the pixel circuit), writing the target data voltage into the gate of the driving transistor corresponding to the second color sub-pixel by the data voltage writing module, therefore, in the light emitting stage in one frame, the crosstalk of the light emitted by the second color sub-pixel in the preset monochromatic light emitted by the first color sub-pixel is reduced. In the black insertion stage, the target data voltage is written into the pixel driving circuit corresponding to the second color sub-pixel, so that the voltage difference between the second color sub-pixel and the first color sub-pixel under the preset gray scale is reduced, and the problem of matched white light color coordinate offset caused by monochromatic light color coordinate deviation due to the fact that the second color sub-pixel is lightened when the first color sub-pixel is lightened is solved, and therefore crosstalk among sub-pixels with different colors is favorably reduced, and color cast is favorably improved.
As another alternative implementation manner of the embodiment of the present invention, fig. 4 is a flowchart of another driving method of a display panel provided in the embodiment of the present invention, and on the basis of the foregoing embodiment, referring to fig. 4, the driving method of the display panel includes:
s210, calculating preset brightness respectively corresponding to different color sub-pixels in the display panel under a preset gray scale according to the white light brightness under the preset gray scale and the brightness ratio of the different color sub-pixels.
S220, determining crosstalk current according to the corresponding driving voltage of the first color sub-pixel under the preset gray scale, the relation between the driving voltage and the current of the second color sub-pixel and the common layer resistance of the first color sub-pixel and the second color sub-pixel.
And S230, determining the real current flowing through the second color sub-pixel according to the crosstalk current and the corresponding preset current of the second color sub-pixel under the preset gray scale.
Specifically, before the display panel displays, a current-voltage-luminance curve test (IVL test) may be performed on the sub-pixels corresponding to each color in the display panel, and the driving voltage and current corresponding to each monochromatic light at any luminance may be obtained from the IVL test curve. Fig. 5 is a graph of current and luminance according to an embodiment of the present invention, and fig. 6 is a graph of voltage and luminance according to an embodiment of the present invention. Referring to fig. 5 and 6, the relationship between the voltage and the current corresponding to the sub-pixel of any color can be obtained. Under a normal condition, the first color sub-pixel and the second color sub-pixel share the same cathode layer, in the process of lighting the first color sub-pixel, if the red crosstalk brightness corresponding to the second color sub-pixel when the second color sub-pixel is secretly lighted is R1, the crosstalk voltage corresponding to the second color sub-pixel is V1 according to the IVL test curve, under a preset gray scale, the preset brightness of blue light emitted by the first color sub-pixel is Brel, the corresponding data driving voltage is Vblue, and the preset current of the second color sub-pixel is Ired. Since the second color sub-pixel is lighted by the driving circuit corresponding to the first color sub-pixel, the driving voltage of the first color sub-pixel is equal to the sum of the driving voltage of the second color sub-pixel and the divided voltage of the common layer resistor, i.e. Vblue is V1+ IR, where I is the crosstalk current. The crosstalk current I can be calculated in combination with the IVL test curve of the second color sub-pixel. In summary, when the crosstalk phenomenon occurs, the real current flowing through the second color sub-pixel is equal to the sum of the crosstalk current I and the preset current Ired.
S240, determining the target brightness corresponding to the second color sub-pixel under the preset gray scale according to the corresponding relation between the real current and the current and brightness corresponding to the second color sub-pixel, and determining the target driving voltage corresponding to the second color sub-pixel under the preset gray scale according to the relation between the brightness corresponding to the second color sub-pixel and the driving voltage.
Specifically, according to the IVL test curve of red light, the target luminance Rrel of red light corresponding to the real current flowing through the second color sub-pixel emitting red light can be obtained, and the target driving voltage corresponding to the second color sub-pixel under the preset gray scale is determined according to the relationship between the luminance and the driving voltage shown in fig. 6.
S250, writing a target data voltage corresponding to the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel during the black insertion stage in one frame, so that the second color sub-pixel emits light according to the target data voltage during the light emitting stage in one frame.
Optionally, before determining, at least according to a driving voltage of a first color sub-pixel emitting preset monochromatic light at a preset gray scale and a common layer resistance of the first color sub-pixel and a second color sub-pixel, a corresponding target luminance and a corresponding target driving voltage of the second color sub-pixel at the preset gray scale, the method further includes: and acquiring the target crosstalk intensity of the preset monochromatic light under the preset gray scale. The crosstalk effect is further optimized by obtaining the target crosstalk strength. Fig. 7 is a flowchart of another driving method of a display panel according to an embodiment of the present invention, and referring to fig. 7, the driving method includes:
s310, acquiring the target crosstalk intensity of the preset monochromatic light under the preset gray scale.
Specifically, the crosstalk is a phenomenon that when a sub-pixel corresponding to a certain monochromatic light is lit, sub-pixels corresponding to other colors of light are lit at the same time due to different lighting voltages of the sub-pixels with different colors, so as to cause crosstalk between the other colors of light, that is, when the sub-pixel corresponding to the monochromatic light is lit, the sub-pixels corresponding to the other colors of light are stolen and lighted, so as to cause a deviation of color coordinates of the monochromatic light, and finally cause a deviation of color coordinates of the white light. The reason why the crosstalk occurs is that the lighting voltages corresponding to the sub-pixels of different colors are different, and when the sub-pixel with higher lighting voltage is lighted in a low gray scale, the current flows from the common current to the sub-pixels of other colors due to the influence of the crosstalk current, and the sub-pixel with the lower lighting voltage can also be lighted, so that the light emitted by the sub-pixel with lower lighting voltage is crosstalk among the light emitted by the sub-pixel with higher lighting voltage.
In general, crosstalk is less likely to occur in light emitted from each color sub-pixel in the display panel at a high gray level, and since the ability of human eyes to recognize the uniformity of the luminance of the display screen at a high gray level is limited, crosstalk is more likely to occur in light of each color at a low gray level. Optionally, the preset gray scale may be smaller than 16 gray scale or smaller than 32 gray scale, taking the preset gray scale as 16 gray scale as an example, under 16 gray scale, the lighting voltage of the blue sub-pixel is 2.9V, and the lighting voltage of the red sub-pixel is 2V, so that when the blue sub-pixel is lighted, the current is made to be transversely conductive through the common layer due to the influence of crosstalk current, so that the red sub-pixel can be lighted, and further, the phenomenon of crosstalk red light in blue light occurs. In the display process of the display panel, it is necessary to ensure that certain crosstalk intensity is satisfied between lights of different colors to achieve a normal display effect, and to ensure that the degree of color cast of a display picture is low. The target crosstalk strength refers to the maximum degree of crosstalk allowed to occur in other color lights in a certain monochromatic light when the display panel displays in a low gray scale, so as to avoid affecting the display effect. Due to the limitation of the manufacturing process, the target crosstalk intensity of each monochromatic light is different, so that the target crosstalk intensity of one monochromatic light can be directly obtained at a production manufacturer, or the target crosstalk intensity can be determined by the percentage of the peak value of the monochromatic light in the spectrum to the peak value of other monochromatic lights when crosstalk occurs, for example, the target crosstalk intensity of blue light to red light is 3% at 16 gray scales.
S320, calculating the preset brightness respectively corresponding to the sub-pixels with different colors in the display panel under the preset gray scale according to the white light brightness under the preset gray scale and the brightness ratio of the sub-pixels with different colors.
S330, determining the corresponding target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale at least according to the driving voltage of the first color sub-pixel emitting the preset monochromatic light under the preset gray scale, the common layer resistance of the first color sub-pixel and the second color sub-pixel and the target crosstalk intensity.
For example, when the first color sub-pixel is a blue sub-pixel emitting blue light and the second color sub-pixel may be a red sub-pixel emitting red light, assuming that the preset gray scale is 16 gray scales, the luminance of the first color sub-pixel at the 16 gray scales is B1, the driving voltage is Vblue, and the target crosstalk intensity of crosstalk in the blue light is 3%; according to the method for calculating the target brightness, the target brightness corresponding to the second color sub-pixel under the 16 gray scale is obtained as Rrel, and the target driving voltage Vmr corresponding to the second color sub-pixel under the target brightness Rrel can be obtained from the red light IVL test curve, that is, under the 16 gray scale, when the target brightness corresponding to the second color sub-pixel is Rrel and the corresponding target driving voltage is Vmr, the target crosstalk intensity can be guaranteed to be satisfied.
S340, writing a target data voltage corresponding to the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel during the black insertion stage in one frame, so that the second color sub-pixel emits light according to the target data voltage during the light emitting stage in one frame.
Optionally, the time ratio of the black insertion period in one frame is inversely related to the brightness ratio, where the brightness ratio is a ratio of the preset brightness corresponding to the second color sub-pixel to the target brightness. Since the target brightness of the second color sub-pixel calculated in the step 130 at the preset gray level is usually higher than the preset brightness of the preset gray level, the brightness perceived by human eyes can be reduced by performing the black insertion operation on the second color sub-pixel. The longer the time proportion of the black insertion stage in one frame is, the smaller the brightness perceived by human eyes is, and the shorter the time proportion of the black insertion stage in one frame is, the larger the brightness perceived by human eyes is. The time ratio of the black insertion stage in one frame can be determined according to the ratio of the preset brightness to the target brightness, and the larger the ratio of the preset brightness to the target brightness is, the closer the target brightness is to the preset brightness is, and the time for controlling the black insertion stage is relatively shorter at the moment; the smaller the ratio of the preset brightness to the target brightness is, the larger the difference between the target brightness and the preset brightness is, and the longer the black insertion period can be controlled to reduce the brightness perceived by human eyes, thereby being more beneficial to improving the problem of low gray scale color cast of white light.
Exemplarily, the first color sub-pixel is a blue sub-pixel emitting blue light, the second color sub-pixel is a red sub-pixel emitting red light, the preset gray scale is 16 gray scales, the preset brightness Rred of the red light is calculated according to the brightness ratio of the red light to the white light, the brightness of the first color sub-pixel is B1 under the 16 gray scales, the driving voltage is Vblue, and the target crosstalk intensity of the crosstalk red light in the blue light is 3%; according to the method for calculating the target crosstalk intensity, the target brightness of the second color sub-pixel corresponding to the 16 gray scales is obtained as Rrel. Because the starting voltage of the red sub-pixel is low, after the brightness corresponding to the red light is adjusted to the target brightness Rrel, the target brightness Rrel of the red light is larger than the actual brightness required by the actual red light in order to meet the target crosstalk intensity and prevent the red light from crosstalk, that is, the target brightness Rrel of the red light is larger than the preset brightness Rred. And performing black insertion on the second color sub-pixel emitting the red light according to the ratio of the brightness ratio to the red/Rrel, namely, in one frame, the ratio of the time of the red light to the target brightness Rrel to the time of the one frame is Rred/Rrel, otherwise, the ratio of the black insertion time to the time of the one frame is 1-Rred/Rrel, namely, the ratio of the preset brightness Rred corresponding to the second color sub-pixel to the target brightness Rrel is inversely related to the ratio of the black insertion time in the one frame. At this time, the ratio 1-Rred/Rrel of the black insertion time to one frame time is the black insertion time corresponding to the black insertion stage. Then, a corresponding target driving voltage is obtained in the IVL test curve according to a target brightness Rrel corresponding to the second color sub-pixel, and in a black insertion stage in one frame, a target data voltage corresponding to the second color sub-pixel is written into a pixel driving circuit corresponding to the second color sub-pixel, so that in a light emitting stage in one frame, the data voltage of the second color sub-pixel is maintained at the target data voltage, that is, the brightness and the driving voltage corresponding to the second color sub-pixel under a preset gray scale are re-determined at least according to the driving voltage of the first color sub-pixel under the preset gray scale, wherein the target driving voltage can be larger than the preset voltage of the second color sub-pixel under the preset gray scale, so as to increase the working voltage of the second color sub-pixel under the preset gray scale, reduce the voltage difference between the first color sub-pixel and the second color sub-pixel under the preset gray scale, and further facilitate lightening the first color sub-pixel, the second color sub-pixel is also lighted to cause the problem of matching white light color coordinate deviation caused by monochromatic light color coordinate deviation, so that the crosstalk is favorably improved, and the color cast is improved.
Optionally, the black insertion phase comprises a first black insertion sub-phase preceding the light emission phase; writing a target data voltage corresponding to the target driving voltage into a pixel driving circuit corresponding to the second color sub-pixel in a black insertion stage in one frame, so that the second color sub-pixel emits light according to the target data voltage in a light emitting stage in one frame to meet a target crosstalk strength, comprising:
and writing the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel in the first black insertion sub-stage in one frame, so that the second color sub-pixel emits light according to the target data voltage in the light emitting stage in one frame to meet the target crosstalk intensity. Optionally, the first black insertion sub-stage includes a data writing stage in an operating process of the existing pixel driving circuit, and when the black insertion stage only includes the first black insertion sub-stage before the light emitting stage, a time ratio of the first black insertion sub-stage and the light emitting stage in one frame may be adjusted according to a ratio of a preset luminance corresponding to the second color sub-pixel to the target luminance.
Optionally, the black insertion phase further includes a second black insertion sub-phase after the light emitting phase, and specifically, since the first black insertion sub-phase is generally controlled by the scan signal, and the pulse of the scan signal is generally fixed, the duration of the first black insertion sub-phase is generally fixed. After the light-emitting period of the pixel circuit corresponding to the second color sub-pixel, the second color sub-pixel is controlled to be in the dark state, and then the duty ratio of the whole black insertion period in one frame can be controlled by controlling the time of the second black insertion sub-period and the light-emitting period. The proportion 1-Rred/Rrel of the black insertion time in one frame time is the proportion of the sum of the black insertion time corresponding to the first black insertion sub-stage and the second black insertion sub-stage in one frame time.
The technical scheme provided by the embodiment of the invention comprises the steps of obtaining the target crosstalk intensity of preset monochromatic light under a preset gray scale, calculating the preset brightness respectively corresponding to different color sub-pixels in a display panel under the preset gray scale according to the white light brightness and the different color sub-pixel brightness ratio under the preset gray scale, and then determining the target brightness and the corresponding target driving voltage of a second color sub-pixel under the preset gray scale at least according to the driving voltage of a first color sub-pixel which emits the preset monochromatic light under the preset gray scale; and writing a target data voltage corresponding to the target driving voltage into a pixel driving circuit corresponding to the second color sub-pixel at a black insertion stage in one frame, wherein the target driving voltage and the target brightness corresponding to a preset gray scale, which are written into the second color sub-pixel, are calculated according to at least the driving voltage when the first color sub-pixel is in crosstalk, the common layer resistance of the first color sub-pixel and the second color sub-pixel, and the target crosstalk strength, so that the brightness of the second color sub-pixel under the preset gray scale can be ensured to meet the target crosstalk strength, crosstalk among different color sub-pixels can be reduced, color cast can be improved, and the voltage difference among the color sub-pixels under the preset gray scale can be reduced by writing the target data voltage into the pixel driving circuit corresponding to the second color sub-pixel, thereby reducing the problem of electric leakage crosstalk among the color sub-pixels, when the light emitted by each color sub-pixel is matched into white light, the color coordinate offset of the white light is favorably improved.
Optionally, the display panel in the embodiment of the present invention includes sub-pixels of different colors, and the lighting voltage of the sub-pixel of the first color is greater than the lighting voltage of the sub-pixel of the second color.
Specifically, since the lighting voltage of the first color sub-pixel is greater than the lighting voltage of the second color sub-pixel, when only the first color pixel is to be lit, the current for lighting the first color sub-pixel flows to the second color sub-pixel through the common layer, so that the second color sub-pixel may be lit. In this embodiment, the target brightness and the target driving voltage of the second color sub-pixel under the preset gray scale are determined according to the driving voltage of the first color sub-pixel emitting the preset monochromatic light under the preset gray scale, that is, the brightness and the driving voltage of the second color sub-pixel under the preset gray scale are re-determined according to the driving voltage of the first color sub-pixel when the crosstalk occurs, wherein the target driving voltage may be greater than the preset voltage of the second color sub-pixel under the preset gray scale, so as to increase the working voltage of the second color sub-pixel under the preset gray scale, reduce the voltage difference between the first color sub-pixel and the second color sub-pixel under the preset gray scale, and further facilitate reducing the problem of coordinate deviation of the monochromatic light caused by the coordinate deviation of the monochromatic light due to the fact that the second color sub-pixel is also lighted when the first color sub-pixel is lighted, so as to facilitate improving the crosstalk, thereby improving color cast.
Optionally, the first color sub-pixel has the highest lighting voltage, and the second color sub-pixel has the lowest lighting voltage. Specifically, crosstalk is most easily formed between the sub-pixels with the lowest lighting voltage and the sub-pixels with the highest lighting voltage, that is, when only the sub-pixel with the highest lighting voltage is desired to be lit, the sub-pixel with the lowest lighting voltage is most easily lit due to the current in the common layer.
Fig. 8 is a flowchart of another driving method of a display panel according to an embodiment of the invention. As an optional implementation manner of the embodiment of the present invention, fig. 8 shows a calculation method for calculating the corresponding preset luminance of the sub-pixels with different colors at the preset gray level. Referring to fig. 8, the driving method of the display panel includes:
and S410, acquiring the target crosstalk intensity of the preset monochromatic light under the preset gray scale.
S420, calculating first brightness respectively corresponding to different color sub-pixels in the display panel under the preset gray scale according to the white light brightness under the preset gray scale and the brightness ratio of the different color sub-pixels.
Specifically, the first luminance corresponding to the sub-pixels with different colors is the luminance of the monochromatic light calculated by the luminance ratio of the sub-pixels with different colors, and is not equal to the real luminance of the monochromatic light. Illustratively, assume that the white light brightness at 255 gray levels is W255When the preset gamma value is gamma, the preset gray level (such as 16 gray levels)White light brightness W16Satisfy the requirement of
Figure BDA0002608399020000201
Therefore, the white light brightness under the preset gray scale can be calculated. The color coordinate of red light is (X)R，YR) The green light has a color coordinate of (X)G，YG) The color coordinate of blue light is (X)B，YB) The color coordinate of the white light is (X)W，YW) Then, the brightness ratio after the red, green and blue lights are matched into white light satisfies the following matrix relationship:
Figure BDA0002608399020000202
after the brightness ratios of red, green and blue colors (R% is the brightness ratio of red light, G% is the brightness ratio of green light, and B% is the brightness ratio of blue light) are calculated, a first brightness Rx corresponding to red light, a first brightness Gx corresponding to green light and a first brightness Bx corresponding to blue light can be respectively calculated according to the brightness of white light and the brightness ratios of the red, green and blue colors under a preset gray scale.
S430, calculating preset brightness corresponding to the sub-pixels with different colors under the preset gray scale according to the first brightness and the screen body parameters.
Specifically, the preset brightness may be calculated according to the first brightness and screen parameters, where the screen parameters include screen aperture ratios corresponding to different color sub-pixels (the screen aperture ratio corresponding to the red sub-pixel is r%, the screen aperture ratio corresponding to the green sub-pixel is g%, and the screen aperture ratio corresponding to the blue sub-pixel is b%) and a transmittance k of the screen polarizer. Preferably, the ratio of the first brightness to the predetermined brightness is equal to the product of the aperture ratio of the panel and the transmittance of the polarizer, and the predetermined brightness Rrel/(r% × k) of red light is illustrated by taking red light as an example.
S440, determining the corresponding target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale at least according to the driving voltage of the first color sub-pixel emitting the preset monochromatic light under the preset gray scale, the common layer resistance of the first color sub-pixel and the second color sub-pixel and the target crosstalk intensity.
S450, during the black insertion period in one frame, writing the target data voltage corresponding to the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel, so that the second color sub-pixel emits light according to the target data voltage during the light emitting period in one frame.
As another optional implementation manner of the embodiment of the present invention, fig. 9 is a flowchart of a method for calculating a target luminance and a target driving voltage according to the embodiment of the present invention, and on the basis of the foregoing embodiment, with reference to fig. 9, S440 specifically includes:
and S441, determining the crosstalk brightness of the second color sub-pixel according to the target crosstalk intensity.
Specifically, the target crosstalk strength refers to the maximum degree of crosstalk of other color lights in a certain monochromatic light when the display panel displays in a low gray scale, for example, the target crosstalk strength of crosstalk of blue light emitted by a first color sub-pixel to crosstalk of red light emitted by a second color sub-pixel is 3%, that is, the intensity of an emission peak of red light is 3% of the intensity of an emission peak of blue light, and at this time, the spectrum of red light is 3%
Figure BDA0002608399020000211
The photopic function of the red light is q, so that the crosstalk brightness of the red light can be obtained
Figure BDA0002608399020000212
S442, determining crosstalk current according to the driving voltage corresponding to the first color sub-pixel under the preset gray scale, the crosstalk driving voltage corresponding to the crosstalk brightness of the second color sub-pixel, and the common layer resistance of the first color sub-pixel and the second color sub-pixel.
And S443, determining a real current flowing through the second color sub-pixel according to the crosstalk current and a preset current corresponding to the second color sub-pixel under a preset gray scale.
Specifically, before the display panel displays, a current-voltage-luminance curve test (IVL test) may be performed on the sub-pixels corresponding to each color in the display panel, and the driving voltage and current corresponding to each monochromatic light at any luminance may be obtained from the IVL test curve. With continued reference to fig. 5 and 6, when the preset luminance corresponding to any color sub-pixel is obtained, the current corresponding to the preset luminance can be obtained, and then the corresponding driving voltage can be obtained from the current. Illustratively, under the preset gray scale, the preset brightness of the blue light emitted by the first color sub-pixel is Brel, the corresponding driving voltage is Vblue, and the preset current of the second color sub-pixel is Ired; as can be seen from step S3311, the crosstalk brightness of the red light emitted by the second color sub-pixel is Rspec, and the crosstalk driving voltage Vspec corresponding to the crosstalk brightness Rspec can be obtained according to the IVL test curve of the red light. When crosstalk occurs, the resistance value of the common layer which is transversely conducted between the first color sub-pixel and the second color sub-pixel is R, so that the divided voltage V on the resistor is Vblue-vseec, and the crosstalk current I flowing through the resistor R and the second color sub-pixel is V/R. In summary, when the crosstalk phenomenon occurs, the real current flowing through the second color sub-pixel is equal to the sum of the crosstalk current I and the preset current Ired.
S444, determining target brightness corresponding to the second color sub-pixel under the preset gray scale according to the corresponding relation between the real current and the current and brightness corresponding to the second color sub-pixel, and determining target driving voltage corresponding to the second color sub-pixel under the preset gray scale according to the relation between the brightness corresponding to the second color sub-pixel and the driving voltage.
Specifically, according to the IVL test curve of red light, the target luminance Rrel of red light corresponding to the real current flowing through the second color sub-pixel emitting red light can be obtained, and the target driving voltage corresponding to the second color sub-pixel under the preset gray scale is determined according to the relationship between the luminance and the driving voltage shown in fig. 6.
For example, the embodiment of the present invention specifically illustrates a specific working principle of the driving method of the display panel provided by the embodiment of the present invention, in which the first color sub-pixel is a blue sub-pixel, and the second color sub-pixel is a red sub-pixel:
obtaining the target crosstalk intensity of the blue light according to the percentage of the intensity of the emission peak of the red light in the intensity of the emission peak of the blue light when crosstalk occurs, wherein the target crosstalk intensity refers to displayThe maximum degree of red light crosstalk is allowed in the blue light when the panel is displayed in low gray scale (less than 16 gray scale). And carrying out IVL test on the red light to obtain an IVL test curve, and obtaining the driving voltage and the preset current corresponding to any red light brightness from the curve. The white light can be formed by the light with different colors according to a certain brightness ratio to carry out picture display, the white light brightness and the brightness of the monochromatic light under different gray scales are different, so that the brightness of the sub-pixels with different colors can be calculated according to the brightness ratio of the light emitted by the sub-pixels with different colors to the white light under a specific gray scale, wherein the brightness ratio of the sub-pixels with different colors can be calculated by a color coordinate matrix. The preset brightness is the corresponding real brightness of the sub-pixels with different colors under the preset gray scale. If the target crosstalk intensity of the blue light emitted by the first color sub-pixel and the red light emitted by the second color sub-pixel is 3%, the spectrum of the red light can be obtained as
Figure BDA0002608399020000231
The photopic function of the red light is q, so that the crosstalk brightness of the red light can be obtained
Figure BDA0002608399020000232
Under the preset gray scale, the preset brightness of the blue light emitted by the first color sub-pixel is Brel, the corresponding driving voltage is Vbacklight, and the preset current of the second color sub-pixel is Ired; as shown in step S443, the crosstalk luminance of the red light emitted by the second color sub-pixel is Rspec, and the crosstalk driving voltage Vspec corresponding to the crosstalk luminance Rspec can be obtained according to the IVL test curve of the red light. When crosstalk occurs, the resistance value of the common layer which is transversely conducted between the first color sub-pixel and the second color sub-pixel is R, so that the divided voltage V on the resistor is Vblue-vseec, and the crosstalk current I flowing through the resistor R and the second color sub-pixel is V/R. In summary, when the crosstalk phenomenon occurs, the real current flowing through the second color sub-pixel is equal to the sum of the crosstalk current I and the preset current Ired. And according to the IVL test curve of the red light, obtaining the target brightness Rrel of the red light corresponding to the real current flowing through the second color sub-pixel emitting the red light, wherein the red sub-pixel is lightenedTherefore, after the brightness corresponding to the red light is adjusted to the target brightness Rrel, the target brightness Rrel of the red light is certainly greater than the actual brightness required by the actual red light, that is, the target brightness Rrel of the red light is greater than the preset brightness Rred, in order to meet the target crosstalk strength, so that the red light is not subjected to crosstalk. And carrying out black insertion on the second color sub-pixel emitting the red light according to the ratio of Rred/Rrel, wherein the ratio of black insertion time to one frame time is 1-Rred/Rrel. And finally, determining the target driving voltage corresponding to the second color sub-pixel under the preset gray scale according to the relationship between the brightness and the driving voltage. In a black insertion stage in one frame, writing a target driving voltage corresponding to the second color sub-pixel into a pixel driving circuit corresponding to the second color sub-pixel, that is, adjusting the driving voltage corresponding to the second color sub-pixel to the target driving voltage in a time period in which the ratio of the black insertion time in one frame to the frame time is 1-Rred/Rrel, that is, re-determining the brightness and the driving voltage corresponding to the second color sub-pixel under the preset gray scale according to the target crosstalk strength, wherein the target driving voltage may be greater than the preset voltage of the second color sub-pixel under the preset gray scale, so as to increase the working voltage of the second color sub-pixel under the preset gray scale, reduce the voltage difference between the first color sub-pixel and the second color sub-pixel under the preset gray scale, thereby being beneficial to reducing the problem of white light coordinate shift caused by the monochromatic light color coordinate deviation of the second color sub-pixel when the first color sub-pixel is lighted, thereby being beneficial to improving crosstalk and further improving color cast.
Optionally, an embodiment of the present invention further provides a driving apparatus for a display panel, which is used to execute the driving method for a display panel provided in any embodiment of the present invention. Fig. 10 is a schematic structural diagram of a driving apparatus of a display panel according to an embodiment of the present invention, and referring to fig. 10, the driving apparatus includes:
the preset brightness calculation module 51 is configured to calculate preset brightnesses respectively corresponding to different color sub-pixels in the display panel at a preset gray scale according to the white light brightness at the preset gray scale and the different color sub-pixel ratios;
the target brightness and target driving voltage calculation module 52 is configured to determine, according to at least a driving voltage of a first color sub-pixel emitting preset monochromatic light at a preset gray scale and a common layer resistance of the first color sub-pixel and a second color sub-pixel, a target brightness and a corresponding target driving voltage of the second color sub-pixel at the preset gray scale;
the driving module 53 is configured to write a target data voltage corresponding to the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel in a display stage of one frame, so that the second color sub-pixel emits light according to the target data voltage in a light emitting stage of one frame.
The driving apparatus for a display panel according to an embodiment of the present invention is capable of performing the driving method for a display panel according to any embodiment of the present invention, and includes a module for performing the driving method.
Optionally, an embodiment of the present invention further provides a display panel, which is driven by using the driving method of the display panel provided in any embodiment of the present invention, so that the display panel provided in the embodiment of the present invention also has the beneficial effects described in any embodiment above.
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 (10)

1. A method of driving a display panel, comprising:
calculating preset brightness respectively corresponding to different color sub-pixels in the display panel under a preset gray scale according to the white light brightness under the preset gray scale and the brightness ratio of the different color sub-pixels;
determining target brightness and target driving voltage corresponding to a second color sub-pixel under the preset gray scale at least according to the driving voltage of the first color sub-pixel emitting preset monochromatic light under the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel;
writing a target data voltage corresponding to the target driving voltage into a pixel driving circuit corresponding to the second color sub-pixel in a black insertion stage in one frame, so that the second color sub-pixel emits light according to the target data voltage in a light emitting stage in one frame;
wherein the second color sub-pixel comprises at least one color sub-pixel in the display panel except the first color sub-pixel.
2. The method for driving a display panel according to claim 1,
the time ratio of the black insertion stage in the frame is inversely related to the brightness ratio, and the brightness ratio is the ratio of the preset brightness corresponding to the second color sub-pixel to the target brightness.
3. The method according to claim 1, wherein the black insertion phase comprises a first black insertion sub-phase before the light emission phase;
the writing a target data voltage corresponding to the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel in the black insertion stage in one frame so that the second color sub-pixel emits light according to the target data voltage in the light emitting stage in one frame includes:
writing the target data voltage into a pixel driving circuit corresponding to the second color sub-pixel in the first black insertion sub-stage in one frame so as to enable the second color sub-pixel to emit light according to the target data voltage in the light emitting stage in one frame;
preferably, the black insertion phase further comprises a second black insertion sub-phase following the light emission phase.
4. The method according to claim 1, wherein the second color sub-pixels comprise other color sub-pixels of the display panel except the first color sub-pixels.
5. The method according to claim 1, wherein a lighting voltage of the first color sub-pixel is greater than a lighting voltage of the second color sub-pixel.
6. The method as claimed in claim 1, wherein the calculating the preset luminances of the different color sub-pixels of the display panel respectively corresponding to the preset grayscales according to the white luminance and the different color sub-pixel luminance ratios at the preset grayscales comprises:
calculating first brightness respectively corresponding to different color sub-pixels in the display panel under the preset gray scale according to the white light brightness under the preset gray scale and the brightness ratio of the different color sub-pixels;
calculating preset brightness respectively corresponding to the sub-pixels with different colors under the preset gray scale according to the first brightness and the screen body parameters;
the screen body parameters comprise screen body opening rates corresponding to the sub-pixels with different colors and transmittance of a screen body polaroid;
preferably, a ratio of the first brightness to the preset brightness is equal to a product of the aperture ratio of the screen body and the transmittance of the polarizer.
7. The method for driving a display panel according to claim 1, wherein the determining the target luminance and the target driving voltage corresponding to the second color sub-pixel at the preset gray scale according to at least the driving voltage of the first color sub-pixel emitting the preset monochromatic light at the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel comprises:
determining the target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale according to the driving voltage of the first color sub-pixel which emits the preset monochromatic light under the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel, and specifically comprising the following steps:
determining crosstalk current according to the corresponding driving voltage of the first color sub-pixel under the preset gray scale, the relation between the driving voltage and the current of the second color sub-pixel and the common layer resistance of the first color sub-pixel and the second color sub-pixel;
determining the real current flowing through the second color sub-pixel according to the crosstalk current and the corresponding preset current of the second color sub-pixel under the preset gray scale;
and determining the target brightness corresponding to the second color sub-pixel under the preset gray scale according to the corresponding relation between the real current and the current and brightness corresponding to the second color sub-pixel, and determining the target driving voltage corresponding to the second color sub-pixel under the preset gray scale according to the relation between the brightness corresponding to the second color sub-pixel and the driving voltage.
8. The method for driving a display panel according to claim 1, wherein before determining the target luminance and the target driving voltage corresponding to the second color sub-pixel at the preset gray scale according to at least the driving voltage of the first color sub-pixel emitting the preset monochromatic light at the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel, the method further comprises:
acquiring the target crosstalk intensity of the preset monochromatic light under a preset gray scale;
the method for determining the corresponding target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale according to the driving voltage of the first color sub-pixel emitting the preset monochromatic light under the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel comprises the following steps:
determining the corresponding target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale according to the driving voltage of the first color sub-pixel emitting the preset monochromatic light under the preset gray scale, the common layer resistance of the first color sub-pixel and the second color sub-pixel and the target crosstalk intensity, and specifically comprising:
determining crosstalk brightness of the second color sub-pixel according to the target crosstalk intensity;
determining crosstalk current according to a driving voltage corresponding to the first color sub-pixel under the preset gray scale, a crosstalk driving voltage corresponding to crosstalk brightness of the second color sub-pixel and common layer resistance of the first color sub-pixel and the second color sub-pixel;
determining the real current flowing through the second color sub-pixel according to the crosstalk current and the corresponding preset current of the second color sub-pixel under the preset gray scale;
and determining the target brightness corresponding to the second color sub-pixel under the preset gray scale according to the corresponding relation between the real current and the current and brightness corresponding to the second color sub-pixel, and determining the target driving voltage corresponding to the second color sub-pixel under the preset gray scale according to the relation between the brightness corresponding to the second color sub-pixel and the driving voltage.
9. A driving apparatus of a display panel, comprising:
the preset brightness calculation module is used for calculating the preset brightness of the sub-pixels with different colors in the display panel respectively corresponding to the preset gray scale according to the white light brightness and the sub-pixel proportion with different colors in the preset gray scale;
the target brightness and target driving voltage calculation module is used for determining the corresponding target brightness and the corresponding target driving voltage of the second color sub-pixel under the preset gray scale at least according to the driving voltage of the first color sub-pixel which emits the preset monochromatic light under the preset gray scale and the common layer resistance of the first color sub-pixel and the second color sub-pixel;
and the driving module is used for writing a target data voltage corresponding to the target driving voltage into the pixel driving circuit corresponding to the second color sub-pixel in a black insertion stage in one frame so as to enable the second color sub-pixel to emit light according to the target data voltage in a light emitting stage in one frame.
10. A display panel driven by the method for driving a display panel according to any one of claims 1 to 8.
CN202010746064.1A 2020-07-29 2020-07-29 Display panel driving method and device and display panel Active CN111833810B (en)

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