CN111653242B - Display panel, display device and driving method of display panel - Google Patents

Display panel, display device and driving method of display panel Download PDF

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Publication number
CN111653242B
CN111653242B CN202010514516.3A CN202010514516A CN111653242B CN 111653242 B CN111653242 B CN 111653242B CN 202010514516 A CN202010514516 A CN 202010514516A CN 111653242 B CN111653242 B CN 111653242B
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pixel
light
emitting element
interval
display panel
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CN111653242A (en
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王玲
盖翠丽
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics 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]
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • 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]
    • 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
    • G09G2320/0257—Reduction of after-image effects

Abstract

The embodiment of the invention discloses a display panel, a display device and a driving method of the display panel. The display panel includes: a first pixel including a first pixel circuit and a first light emitting element, the first pixel circuit being configured to drive the first light emitting element to emit light; the current working interval of the first light-emitting element comprises a first interval and a second interval, the efficiency change of the second interval is relatively stable compared with the efficiency change of the first interval, and the current of the second interval is larger than that of the first interval; the first light-emitting element operates in the second interval. Compared with the prior art, the embodiment of the invention improves the afterimage problem of the display panel and improves the display effect of the display panel.

Description

Display panel, display device and driving method of display panel
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a display device and a driving method of the display panel.
Background
With the continuous development of display technology, the application range of display panels is wider and wider, and the requirements of people on the display panels are higher and higher. In particular, the display quality of the display panel is always one of the important indicators for the quality of the display panel for consumers and panel manufacturers. In a conventional display panel, a plurality of pixel circuits and light-emitting elements are generally included, and the light-emitting elements are driven by the pixel circuits to emit light, thereby performing display. However, the conventional display panel has an image retention problem, which affects the display effect of the display panel.
Disclosure of Invention
The embodiment of the invention provides a display panel, a display device and a driving method of the display panel, which are used for improving the residual image problem of the display panel and improving the display effect of the display panel.
In order to achieve the technical purpose, the embodiment of the invention provides the following technical scheme:
a display panel, comprising: a first pixel including a first pixel circuit and a first light emitting element, the first pixel circuit being configured to drive the first light emitting element to emit light;
the current working interval of the first light-emitting element comprises a first interval and a second interval, the efficiency change of the second interval is relatively stable compared with the efficiency change of the first interval, and the current of the second interval is larger than that of the first interval; the first light-emitting element operates in the second interval.
Further, the display panel further includes: a second pixel including a second pixel circuit and a second light emitting element, the second pixel circuit being for driving the second light emitting element to emit light;
wherein the efficiency change of the current working interval of the second light emitting element is relatively stable compared with the efficiency change of the first interval of the first light emitting element; in one frame, the light-emitting time of the first pixel is shorter than the light-emitting time of the second pixel.
Further, the first pixels include green pixels, and the second pixels include blue pixels and/or red pixels.
Further, the display panel further includes:
a first light emission control signal line electrically connected to the first pixel; the first light-emitting control signal line is used for controlling the light-emitting time of the first pixel;
a second light emission control signal line electrically connected to the second pixel; the second light emission control signal line is used for controlling the light emission time of the second pixel.
Further, a plurality of the first pixels are arranged in a column, and a plurality of the second pixels are arranged in a column;
in the column direction, the first light emission control signal lines and the second light emission control signal lines are alternately arranged; each first light-emitting control signal line is electrically connected with two adjacent rows of the first pixels, and each second light-emitting control signal line is electrically connected with two adjacent rows of the second pixels.
Further, the first pixel comprises a green pixel; the second pixels include blue pixels and red pixels alternately arranged in a column direction;
each first light-emitting control signal line is electrically connected with two adjacent rows of green pixels, and each second light-emitting control signal line is electrically connected with one adjacent row of blue pixels and one adjacent row of red pixels.
Further, the display panel further includes:
a first scan line electrically connected to the first pixel; the first scanning line is used for controlling the initialization time of the first pixel;
a second scan line electrically connected to the second pixel; the second scanning line is used for controlling the initialization time of the second pixel;
wherein the initialization time of the first pixel is greater than the initialization time of the second pixel.
Accordingly, the present invention also provides a display device comprising: a display panel as claimed in any of the embodiments of the invention.
Correspondingly, the present invention further provides a driving method of a display panel, which is applicable to the display panel provided in any embodiment of the present invention, and the driving method includes:
and controlling the first pixel circuit to drive the first light-emitting element to emit light, wherein the first light-emitting element works in the second interval.
Further, the driving method of the display panel further includes:
and controlling the second pixel circuit to drive the second light-emitting element to emit light, wherein the light-emitting time of the first pixel is shorter than that of the second pixel in one frame.
In the embodiment of the invention, the first light-emitting element is arranged to work in the second interval with relatively stable light-emitting efficiency, and the driving current of the first light-emitting element is increased.
On the other hand, the embodiment of the invention has better improvement effect on the problem of image retention under high resolution because the size of each pixel is smaller and the driving current required by the light-emitting element is smaller for the display panel with high resolution, and the light-emitting element under high resolution can more easily work in the first interval with larger efficiency change; meanwhile, the driving transistor can work in a sub-threshold region more easily, so that the threshold compensation effect of the driving transistor is poor. In combination with the transient characteristics of the driving transistors and the threshold voltage compensation difference, the display panel with high resolution has a more serious image sticking problem. By adopting the technical scheme provided by the embodiment of the invention, the first light-emitting element is arranged to work in the second interval, and the driving current of the first light-emitting element is increased, so that the influence of the transient characteristic of the driving transistor on the brightness of the first light-emitting element is weakened, the driving transistor can work in a saturation region, and the threshold compensation effect of the driving transistor is improved.
Drawings
FIG. 1 is a schematic diagram illustrating a current variation of a driving transistor during a gray level switching process in the prior art;
FIG. 2 is a graph illustrating current efficiency versus current density of a conventional light emitting device;
fig. 3 is a graph illustrating current efficiency versus current density of a first light emitting device according to an embodiment of the present invention;
fig. 4 is a graph illustrating current efficiency versus current density of a first light emitting device and a second light emitting device according to an embodiment of the present invention;
fig. 5 is a graph illustrating current efficiency versus current density of a green light emitting device, a red light emitting device and a blue light emitting device according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a first pixel and a second pixel of a display panel according to an embodiment of the invention;
FIG. 7 is a schematic diagram of a driving timing sequence according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a first pixel and a second pixel of another display panel according to an embodiment of the invention;
fig. 9 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another 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.
As described in the background, the conventional display panel has an image sticking problem. The problem of image sticking of the display panel will be explained below. The conventional display panel generally includes a plurality of pixels, each of which includes a pixel circuit including a driving transistor for driving the light emitting element to emit light and a light emitting element, and the driving transistor generates a driving current to control the light emitting luminance of the light emitting element. Fig. 1 is a schematic diagram illustrating a current variation of a driving transistor during a gray level switching process in the prior art. Referring to fig. 1, a curve L1 shows a current variation curve of the driving transistor during the process of switching the light emitting element from the 255 gray scale to the 48 gray scale, and as can be seen from a curve L1, due to a hysteresis effect of the driving transistor, when the pixel is switched from the 255 gray scale to the 48 gray scale, the driving current is firstly decreased and then slowly increased; thus, the brightness of the light emitting element is reduced to 48 gray scale for a short time and then slowly restored to 48 gray scale. A curve L2 represents a current variation curve of the driving transistor during the process of switching the light emitting element from 0 gray scale to 48 gray scale, as can be seen from the curve L2, when the pixel is switched from 0 gray scale to 48 gray scale, the driving current increases first and then decreases slowly; thus, the brightness of the light emitting element is increased to 48 gray scales or more for a short time and then is slowly restored to 48 gray scales. Therefore, in the gray scale switching process of the pixel, the brightness of the light-emitting element cannot be directly switched to the target gray scale, so that the problem of image retention of the display panel is caused.
In the prior art, the transient characteristics of the driving transistor can be improved and the hysteresis effect of the driving transistor can be reduced by improving the process of the driving transistor. For example, the gate insulating layer (GI) and the active layer (Poly) are improved in film quality, interface, or the like. However, the process improvement of the driving transistor has the problems of poor process repeatability, batch fluctuation, poor improvement effect on the afterimage problem and the like.
In order to better solve the problem of the afterimage of the display panel, the inventors further studied and found that the afterimage problem of the display panel is more serious when the pixel is switched from a high gray level to a low gray level. This problem occurs because the current density (i.e., the magnitude of current) and the current efficiency of the light emitting element determine the gradation (i.e., the light emission luminance) of the light emitting element. However, the current efficiency of the light emitting element is not constant, that is, the relationship between the light emission luminance of the light emitting element and the current density is not a direct proportional relationship, and when the current efficiency variation is large, the light emission luminance of the light emitting element is liable to be deviated.
Specifically, the light emitting element operates in an operation region where the efficiency changes relatively greatly in a low gray scale. Fig. 2 is a graph illustrating current efficiency versus current density of a conventional light emitting device. Referring to fig. 2, when the pixel is switched from a high gray level to a low gray level, the operating region of the light emitting element changes from a high current density to a low current density, and falls into an operating region with a relatively large change in efficiency. Therefore, when switching from a high gray level to a low gray level, the transient current difference of the driving current may cause a larger brightness deviation of the light emitting device, which may cause a darker brightness of the light emitting device to be more serious, thereby aggravating the image sticking problem of the display panel.
In view of the above, embodiments of the present invention provide a display panel, which can be applied to an Organic Light-Emitting Diode (OLED) display panel, a Micro Light-Emitting Diode (Micro LED) display panel, a Quantum Dot Light-Emitting Diode (QLED) display panel, or the like. The display panel comprises a first pixel, wherein the first pixel comprises a first pixel circuit and a first light-emitting element, and the first pixel circuit is used for driving the first light-emitting element to emit light.
Fig. 3 is a graph illustrating a current efficiency-current density of a first light emitting device according to an embodiment of the invention. Referring to fig. 3, the current operation interval of the first light emitting element includes a first interval a1 and a second interval a2, the change in efficiency of the second interval a2 is relatively smooth compared to the change in efficiency of the first interval a1, and the current of the second interval a2 is greater than the current of the first interval a 1; the first light emitting element operates in the second interval a 2.
Wherein, in the second interval a2, the current efficiency of the first light emitting element shows a slow variation trend; whereas in the first interval a1, the current efficiency of the first light emitting element shows a tendency of abruptly increasing and abruptly decreasing; therefore, the efficiency variation of the second section a2 is relatively smooth compared to the efficiency variation of the first section a 1.
The first light emitting element operates in the second interval a2, that is, compared with the prior art, the operation interval of the first light emitting element is shifted to the right as a whole, that is, the driving current generated by the driving transistor is increased, so as to avoid the first light emitting element operating in the first interval a1 in the low gray scale. In the display process of the display panel, in one frame, the light-emitting time of the light-emitting element is properly shortened, meanwhile, the light-emitting brightness of the light-emitting element is correspondingly increased, and the brightness of the light-emitting element seen by human eyes is kept unchanged. Therefore, in order to increase the driving current of the driving transistor, the first pixel may be operated in the second interval a2 where the efficiency is relatively stable by adjusting the light emitting time per frame. It should be noted that, the light-emitting body in the first pixel is the first light-emitting element, so the light-emitting time of the first pixel can also be described as the light-emitting time of the first light-emitting element, and the light-emitting brightness of the first pixel can also be described as the light-emitting brightness of the first light-emitting element, which is not distinguished in the present invention.
According to the embodiment of the invention, on one hand, because the first light-emitting element operates in the second interval a2 with relatively stable light-emitting efficiency in low gray scale, the transient characteristic of the driving transistor has little influence on the brightness of the first light-emitting element, and even if the driving current generated by the driving transistor fluctuates, the first light-emitting element is not greatly changed in brightness, thereby being beneficial to improving the problem of image retention of the display panel.
On the other hand, the embodiment of the present invention has a better effect of improving the problem of the afterimage at the high resolution because, for the display panel with the high resolution, the size of each pixel is smaller, the driving current required for the light emitting element is smaller (since the driving current is positively correlated with the area of the light emitting element, the driving current required for the smaller light emitting element is smaller), and the light emitting element with the high resolution is easier to operate in the first interval a1 where the variation in efficiency is larger; meanwhile, the driving transistor can more easily work in the subthreshold region, so that the threshold compensation effect of the driving transistor is poor (since the threshold compensation of the conventional driving transistor is determined according to the current formula of the saturation region, the threshold compensation effect of the driving transistor when the driving transistor works in the subthreshold region is poor). In combination with the transient characteristics of the driving transistors and the threshold voltage compensation difference, the display panel with high resolution has a more serious image sticking problem. By adopting the technical scheme provided by the embodiment of the invention, the first light-emitting element is arranged to work in the second interval A2, and the driving current of the first light-emitting element is increased, so that the influence of the transient characteristic of the driving transistor on the brightness of the first light-emitting element is weakened, the driving transistor can work in a saturation region, and the threshold compensation effect of the driving transistor is improved.
In one embodiment of the present invention, optionally, the first pixel includes a green pixel. The inventors found that the efficiency of the green light emitting element in the first interval a1 changes greatly, and the efficiency in the second interval a2 changes relatively smoothly. In the conventional display panel, the green pixel operates in the first interval a1 in the low gray scale, and the human eye is more sensitive to the green pixel, so the afterimage problem of the green pixel is more serious. In the embodiment of the invention, the first pixels comprise green pixels, namely, the green light-emitting elements work in the second interval A2 with relatively stable efficiency, and the transient characteristic of the driving transistor has reduced influence on the brightness of the green light-emitting elements, so that the problem of image sticking of the green pixels can be improved, namely, a short display plate of the display panel is compensated, and the display effect of the display panel is improved on the whole.
On the basis of the above embodiments, the display panel further includes a second pixel including a second pixel circuit for driving the second light emitting element to emit light and a second light emitting element, similar to the first pixel. The following description will be made of an arrangement of the first pixel and the second pixel, but the present invention is not limited thereto.
Fig. 4 is a graph illustrating current efficiency versus current density of a first light emitting device and a second light emitting device according to an embodiment of the invention. Referring to fig. 4, in an embodiment of the present invention, optionally, the efficiency variation of the current operating interval B of the second light emitting element is relatively smooth compared to the efficiency variation of the first interval a1 of the first light emitting element; in one frame, the light emitting time of the first pixel is shorter than that of the second pixel.
Since the efficiency change of the current operating interval B of the second light emitting element is relatively smooth compared with the efficiency change of the first interval a1 of the first light emitting element, the current operating interval of the second light emitting element does not need to be divided, and the driving current of the second light emitting element can be maintained at the level set in the conventional display panel. In one frame, the second pixel can maintain the light emitting time set in the existing display panel; meanwhile, the light emitting time of the first pixel is shortened so that the light emitting time of the first pixel is shorter than the light emitting time of the second pixel. Thus, the driving current of the first pixel is increased compared to the prior art, which is advantageous for operating the first light emitting element in the second interval a2 where the efficiency is relatively smooth. Therefore, the transient characteristics of the driving transistor have less influence on the brightness of the first light-emitting element, and even if the driving current generated by the driving transistor fluctuates, the first light-emitting element is not greatly changed in brightness, so that the problem of image retention of the display panel is favorably solved.
In one embodiment of the present invention, optionally, the first pixel includes a green pixel, and the second pixel includes a blue pixel and/or a red pixel. Accordingly, the first light emitting element includes a green light emitting element, and the second light emitting element includes a blue light emitting element and/or a red light emitting element.
Fig. 5 is a graph illustrating current efficiency versus current density of a green light emitting device, a red light emitting device, and a blue light emitting device according to an embodiment of the present invention. Referring to fig. 5, the efficiency variation of the current operation interval B of the red light emitting element is relatively smooth compared to the efficiency variation of the first interval a1 of the green light emitting element; and, the efficiency variation of the current operation section B of the blue light emitting element is relatively smooth compared to the efficiency variation of the first section a1 of the green light emitting element. And since the human eye is more sensitive to green, the afterimage problem of the green pixel is more serious than that of the red and blue pixels.
According to the embodiment of the invention, the current working intervals of the red light-emitting element and the blue light-emitting element do not need to be divided, and the driving currents of the red light-emitting element and the blue light-emitting element can keep the magnitude set in the existing display panel. In one frame, the red pixel and the blue pixel can maintain the light emitting time set in the existing display panel; at the same time, the light emission time of the green pixel is shortened so that the light emission time of the green pixel is shorter than the light emission time of the red pixel and the blue pixel. Therefore, compared with the prior art, the driving current of the green light-emitting element is increased, the green light-emitting element, the red light-emitting element and the blue light-emitting element all work in a working interval with relatively stable efficiency, the transient characteristic of the driving transistor has small influence on the brightness of each pixel, and even if the driving current generated by the driving transistor fluctuates, the large brightness change can not be brought, so that the residual image problem of the display panel is favorably improved.
In addition, the green light-emitting element has a longer life than the red light-emitting element and the blue light-emitting element. In addition, the driving current of the light emitting element is increased, which reduces the lifetime of the light emitting element. The embodiment of the invention also arranges the driving current of the red light-emitting element and the blue light-emitting element to be kept unchanged, which is beneficial to keeping the service life of the red light-emitting element and the service life of the blue light-emitting element. In summary, compared with the prior art, the embodiment of the invention has no influence on the overall service life of the display panel. Therefore, the embodiment of the invention separately sets the green pixel and the blue pixel/red pixel, thereby taking the service life of the display panel into consideration and improving the problem of afterimage.
On the basis of the above-described embodiments, the specific structure of the pixel is analyzed as follows. Fig. 6 is a schematic circuit structure diagram of a first pixel and a second pixel of a display panel according to an embodiment of the present invention, and fig. 7 is a schematic driving timing diagram according to an embodiment of the present invention. Referring to fig. 6 and 7, the display panel includes a first pixel 110, a second pixel 120, a first light emission control signal line EM _ G and a second light emission control signal line EM _ R & B, the first pixel 110 including a first pixel circuit 111 and a first light emitting element G, the first light emission control signal line EM _ G being electrically connected to the first pixel 110, the first light emission control signal line EM _ G for controlling on-times of transistors (T11 and T12) electrically connected thereto to control a light emission time of the first light emitting element G. The second pixel 120 includes a second pixel circuit 121 and a second light emitting element R & B, and a second emission control signal line EM _ R & B electrically connected to the second pixel 120 for controlling the turn-on time of transistors (T21 and T22) electrically connected thereto to control the emission time of the second light emitting element R & B. The first light emission control signal line EM _ G and the second light emission control signal line EM _ R & B are separately arranged in the embodiment of the present invention, which is beneficial to separately controlling the light emission time of the first pixel 110 and the second pixel 120.
Illustratively, the first pixel circuit 111 and the second pixel circuit 121 are each a 7T1C pixel circuit, and other control signal lines of the first pixel circuit 111 and the second pixel circuit 121 may be shared in addition to the light emission control signal lines being separately provided. For example, the first pixel circuit 111 and the second pixel circuit 121 share the first power supply line PVDD and the second power supply line PVEE to supply power supply signals, the shared reference voltage line VREF to supply a reference voltage, the shared scanning line S1 to supply a scanning signal to perform initialization of the driving transistors (T14 and T24), the shared scanning line S2 to supply a scanning signal to perform data writing of the driving transistors (T14 and T24), and the shared scanning line S3 to perform anode initialization of the first light emitting element G and the second light emitting element R & B.
Specifically, referring to fig. 6 and 7, the transistors in the pixel circuit are all P-type transistors, and a low level can control the P-type transistors to be turned on, and a high level can control the P-type transistors to be turned off. In one frame T, the driving process of the display panel includes: an initialization phase T1, a data writing phase T2, a first light emitting phase T31, and a second light emitting phase T32.
In the initialization stage T1, the first light emission control signal line EM _ G is at a high level, the transistor T11 and the transistor T12 are controlled to be turned off, the first light emitting element G is turned off from the first pixel circuit 111, and the first light emitting element G does not emit light; meanwhile, the second emission control signal line EM _ R & B is at a high level, the transistor T21 and the transistor T22 are controlled to be turned off, the second light emitting element R & B is turned off from the second pixel circuit 121, and the second light emitting element R & B does not emit light.
The scan line S1 is at low level, the transistor T13 in the first pixel 110 is controlled to be turned on, and the gate of the driving transistor T14 is initialized by the reference voltage on the reference voltage line VREF; meanwhile, the scan line S1 controls the transistor T23 in the second pixel 120 to be turned on, and initializes the gate of the driving transistor T24. The reference voltage is low, which ensures that the driving transistors (T14 and T24) are turned on when entering the data writing phase T2.
In the data write phase T2, the first light emission control signal line EM _ G is still at the high level, and the first light emitting element G maintains the non-light emission state in the initialization phase T1; meanwhile, the second emission control signal line EM _ R & B is still at the low level, and the second light emitting element R & B maintains the non-emission state of the initialization period T1.
The scan line S2 is at a low level, the transistor T15 and the transistor T16 in the first pixel 110 are controlled to be turned on, the data signal V _ G on the data line VDATA _ G is written into the gate of the driving transistor T14 through the transistor T15, the driving transistor T14 and the transistor T16 in sequence, and the first capacitor C1 is charged until the gate voltage of the driving transistor T14 is charged to V _ G- | Vth |, the driving transistor T14 is turned off, and the data writing stage T2 of the first pixel circuit 111 is completed; similarly, the scan line S2 controls the transistor T25 and the transistor T26 in the second pixel 120 to turn on, the data signal V _ R & B on the data line VDATA _ R & B is written into the gate of the driving transistor T24 through the transistor T25, the driving transistor T24 and the transistor T26 in sequence, and charges the second capacitor C2 until the gate voltage of the driving transistor T24 is charged to V _ R & B- | Vth |, the driving transistor T24 is turned off, and the data writing phase T2 of the second pixel circuit 12 is completed.
In the first light-emitting period T31, the first light-emitting control signal line EM _ G is low, and the transistor T11 and the transistor T12 in the first pixel 110 are controlled to be turned on. The first capacitor C1 holds the voltage charged in the data writing phase T2 at the gate of the driving transistor T14, the driving transistor T14 operates in the saturation region, and the driving current generated is:
I＝k(Vgs-Vth)2＝k(Vsg-|Vth|)2＝k[pvdd-(V_G-|Vth|)-|Vth|]2＝k(pvdd-V_G)2；
wherein k is a coefficient related to the coefficient of the transistor itself; vgs is the gate-source voltage of the drive transistor; PVDD is the supply voltage on the first supply line PVDD. The driving current flowing through the first light emitting element G is independent of Vth, and threshold voltage compensation of the driving transistor is realized.
In the second emission period T32, the second emission control signal line EM _ R & B is at a low level, and the transistor T21 and the transistor T22 in the second pixel 120 are controlled to be turned on. The second capacitor C2 holds the voltage charged in the data writing phase T2 at the gate of the driving transistor T24, the driving transistor T24 operates in the saturation region, and the driving current generated is:
I＝k(Vgs-Vth)2＝k(Vsg-|Vth|)2＝k[pvdd-(V_R&B-|Vth|)-|Vth|]2＝k(pvdd-V_R&B)2(ii) a Wherein k is a coefficient related to the coefficient of the transistor itself; vgs is the gate-source voltage of the drive transistor; PVDD is the supply voltage on the first supply line PVDD. Flows through the second light emitting element R&The driving current of B is independent of Vth, and the threshold voltage compensation of the driving transistor is realized.
As can be seen from fig. 7, in one frame T, the time of the first light-emitting period T31 is less than the time of the second light-emitting period T32, i.e., the light-emitting time of the first pixel 110 is less than the light-emitting time of the second pixel 120. Thus, on the premise of maintaining the luminance of the first light-emitting element G unchanged, the driving current of the first light-emitting element G is increased, so that the first light-emitting element G operates in an operating region with relatively stable light-emitting efficiency, the transient characteristic of the driving transistor T14 of the first pixel 110 has little influence on the luminance of the first light-emitting element G, and even if the driving current generated by the driving transistor T14 fluctuates, the first light-emitting element G is not greatly influenced by the transient characteristic, so that the problem of image sticking of the display panel is favorably solved.
Based on the above embodiments, optionally, if the first pixel 110 and the second pixel 120 are located in different columns, the first pixel 110 is provided with the data signal from the first data line VDATA _ G, and the second pixel 120 is provided with the data signal from the second data line VDATA _ R & B (as shown in fig. 6). Alternatively, if the first pixel 110 and the second pixel 120 are located in the same column, the first pixel 110 and the second pixel 120 both provide data signals through the same data line.
It should be noted that fig. 7 exemplarily shows that the end times of the first light-emitting period T31 and the second light-emitting period T32 are the same, but the present invention is not limited thereto, and in other embodiments, the start times of the first light-emitting period T31 and the second light-emitting period T32 may be the same, or the start times and the end times of the first light-emitting period T31 and the second light-emitting period T32 are different, and may be set as needed in practical applications.
In addition to the above embodiments, the initialization time of the first pixel 110 may be set in various ways according to the embodiments of the present invention, and some of the ways are described below, but the present invention is not limited thereto.
With continued reference to fig. 7, in one embodiment of the present invention, optionally, the time of the initialization phase of the first pixel and the second pixel is the same, i.e. the initialization time of the driving transistor in the first pixel and the initialization time of the driving transistor of the second pixel are the same.
In one embodiment of the present invention, optionally, since the time of the first light emitting period T31 of the first pixel is less than the time of the second light emitting period T32 of the second pixel, and the time of one frame is fixed, the time of the initialization period of the first pixel may be set to be greater than the time of the initialization period of the second pixel. By the arrangement, the initialization time of the driving transistor in the first pixel is prolonged, so that the hysteresis effect of the driving transistor is further reduced, and the afterimage problem of the display panel is improved.
Fig. 8 is a schematic circuit diagram of a first pixel and a second pixel of another display panel according to an embodiment of the invention. Referring to fig. 8, in one embodiment of the present invention, the scan lines of the first and second pixels 110 and 120 are optionally separately disposed. Namely, the display panel further includes a first scan line S11 and a second scan line S21; the first scan line S11 is electrically connected to the first pixel 110, and the first scan line S11 is used for controlling the initialization time of the first pixel 110; the second scan line S21 is electrically connected to the second pixel 120, and the second scan line S21 is used for controlling the initialization time of the second pixel 120; such that the initialization time of the first pixel 110 is greater than the initialization time of the second pixel 120.
Optionally, the display panel further includes a third scan line S12, a fourth scan line S22, a fifth scan line S13, and a sixth scan line S23. The third scanning line S12 and the fourth scanning line S22 are electrically connected to the first pixel 110, the third scanning line S12 is used to control the data writing time of the first pixel 110, and the fourth scanning line S22 is used to control the anode initialization time of the first pixel 110. The fifth scan line S13 and the sixth scan line S23 are electrically connected to the second pixel 120, the fifth scan line S13 is used for controlling the data writing time of the second pixel 120, and the sixth scan line S23 is used for controlling the anode initialization time of the second pixel 120. As can be seen from fig. 7, there is a close relationship between the initialization time, the data writing time and the light emitting time of the pixel circuit, and when the initialization time of the first pixel 110 is prolonged, corresponding errors between the data writing time and the light emitting time are caused, and therefore, the start times of the data writing phase and the light emitting phase of the first pixel 110 and the second pixel 210 may be different. In the embodiment of the present invention, the first pixel 110 and the second pixel 210 are respectively controlled by different scan lines, which is beneficial to realizing different initialization times of the first pixel 110 and the second pixel 210.
On the basis of the foregoing embodiments, the embodiments of the present invention further provide specific arrangement modes of the arrangement of the first pixel and the second pixel, and the following description will take the example that the first pixel includes a green pixel, and the second pixel includes a blue pixel and a red pixel, but the present invention is not limited thereto.
Fig. 9 is a schematic structural diagram of a display panel according to an embodiment of the present invention. Referring to fig. 9, in an embodiment of the present invention, optionally, the plurality of first pixels 110 are arranged in a column, and the plurality of second pixels 120 are arranged in a column. In the column direction Y, first emission control signal lines (e.g., EM <2>, EM <4>, EM <6>, EM <8>) and second emission control signal lines (e.g., EM <1>, EM <3>, EM <5>, EM <7>) are alternately arranged in sequence. Each of the first light emission control signal lines is electrically connected to two adjacent rows of the first pixels 110, and each of the second light emission control signal lines is electrically connected to two adjacent rows of the second pixels 120.
Wherein, the first light-emitting control signal lines (for example, EM <2>, EM <4>, EM <6>, EM <8>) are all arranged on the even-numbered lines, and the second light-emitting control signal lines (for example, EM <1>, EM <3>, EM <5>, EM <7>) are all arranged on the odd-numbered lines. The first light-emitting control signal line and the second light-emitting control signal line are arranged in a one-to-two mode, that is, one light-emitting control signal line controls the light-emitting time of two rows of pixels at the same time. Compared with a one-to-one mode, the two-to-one mode is favorable for reducing the number of the light-emitting control signal lines, so that the wiring difficulty is reduced.
With continued reference to fig. 9, in one embodiment of the present invention, optionally, the first pixel 110 includes a green pixel G, the second pixel 120 includes a blue pixel B and a red pixel R, and the blue pixel B and the red pixel R are alternately arranged in the column direction Y; each of the first emission control signal lines (e.g., EM <2>, EM <4>, EM <6>, EM <8>) is electrically connected to two adjacent rows of green pixels G, and each of the second emission control signal lines (e.g., EM <1>, EM <3>, EM <5>, EM <7>) is electrically connected to one adjacent row of blue pixels B and one adjacent row of red pixels R.
Fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 10, in an embodiment of the present invention, optionally, the first pixel 110 includes a green pixel G, the second pixel 120 includes a blue pixel B and a red pixel R, a plurality of green pixels G are arranged in a column, a plurality of blue pixels B are arranged in a column, and a plurality of red pixels R are arranged in a column. The red pixels R, the green pixels G and the blue pixels B are alternately arranged in sequence in the row direction X; each of the first emission control signal lines (e.g., EM <2>, EM <4>, EM <6>, EM <8>) is electrically connected to two adjacent rows of green pixels G, each of the second emission control signal lines (e.g., EM <1>, EM <3>, EM <5>, EM <7>) is electrically connected to two adjacent rows of blue pixels B, and each of the second emission control signal lines (e.g., EM <1>, EM <3>, EM <5>, EM <7>) is electrically connected to two adjacent rows of red pixels R.
It should be noted that fig. 9 and fig. 10 exemplarily show two pixel arrangements, which are not limitative to the present invention, and it is within the scope of the present invention to provide the light emitting control signals separately for the red pixel R/blue pixel B and the green pixel G.
Fig. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 11, in one embodiment of the present invention, the display panel optionally includes a display area 1 and a non-display area 2, and the first pixels 110 and the second pixels 120 are disposed in the display area 1. The display panel further includes: a first gate driving circuit 210 and a second gate driving circuit 220, the first gate driving circuit 210 being electrically connected to a first light emission control signal line (e.g., EM <2>, EM <4>, EM <6>, EM <8>) to supply a first light emission control signal to the first light emission control signal line; the second gate driving circuit 220 is electrically connected to second emission control signal lines (e.g., EM <1>, EM <3>, EM <5>, EM <7>) to supply second emission control signals to the second emission control signal lines.
Optionally, the first gate driving circuit 210 and the second gate driving circuit 220 are disposed in the non-display area 2, the first gate driving circuit 210 and the second gate driving circuit 220 are respectively disposed at two sides of the display area 1, and the first gate driving circuit 210 located at the right of the display area 1 provides a first light-emitting control signal for the first light-emitting control signal line; the second gate driving circuit 220 positioned at the left side of the display panel provides a second light emission control signal to the second light emission control signal line. As can be seen from the foregoing analysis, the embodiment of the present invention employs a one-to-two manner, which is favorable for reducing the number of light-emitting control signal lines and the number of gate driving circuits, thereby reducing the wiring difficulty and reducing the frame width of the display panel.
Fig. 11 illustrates an example of a single-side driving method of the gate driver circuit, but the present invention is not limited thereto, and a double-side driving method may be adopted in another embodiment.
The embodiment of the present invention further provides a display device, which may be, for example, a display screen of a mobile phone, a computer, a tablet computer, a wearable device, a small appliance, a television, and the like, and the display device includes the display panel provided in the above embodiments, and the technical principle and the effects thereof are similar and are not described again.
Optionally, the display panel further includes a first gate driving circuit and a second gate driving circuit, the first gate driving circuit outputs the first light-emitting control signal, the second gate driving circuit outputs the second gate driving signal, and the first gate driving signal and the second gate driving signal have different high and low levels. Correspondingly, the display device also comprises a driving chip, the driving chip is respectively electrically connected with the first grid driving circuit and the second grid driving circuit, and the driving chip provides a first clock signal for the first grid driving circuit so as to control the first grid driving circuit to output a first light-emitting control signal; the driving chip provides a second clock signal to the second gate driving circuit to control the second gate driving circuit to output a second light emitting control signal.
The embodiment of the invention also provides a driving method of the display panel, and the driving method of the display panel can be applied to the display panel provided by any embodiment of the invention. The driving method of the display panel comprises the following steps: and controlling the first pixel circuit to drive the first light-emitting element to emit light, wherein the first light-emitting element works in the second interval. The technical principle and the resulting effect are similar to those of the previous embodiments, and are not described in detail herein.
On the basis of the above embodiment, optionally, the display panel further includes a second pixel including a second pixel circuit and a second light emitting element; wherein the efficiency change of the current working interval of the second light emitting element is relatively smooth compared with the efficiency change of the first interval of the first light emitting element. As a result, the first pixel and the second pixel have different light emission characteristics, and can be provided separately.
The driving method of the display panel further includes: controlling the first pixel circuit to drive the first light-emitting element to emit light, wherein the first light-emitting element works in a second interval; meanwhile, the second pixel circuit is controlled to drive the second light-emitting element to emit light, and the light-emitting time of the first pixel is shorter than that of the second pixel.
In one embodiment of the present invention, optionally, the first pixel includes a green pixel, and the second pixel includes a blue pixel and/or a red pixel.
In an embodiment of the present invention, optionally, the display panel further includes: a first scan line and a second scan line. The first scanning line is electrically connected with the first pixel; the second scanning line is electrically connected with the second pixel.
The driving method of the display panel further includes: the first scanning line controls the initialization time of the first pixel; the second scanning line controls the initialization time of the second pixel; the initialization time of the first pixel is longer than that of the second pixel.
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 panel, comprising: a first pixel including a first pixel circuit and a first light emitting element, the first pixel circuit being configured to drive the first light emitting element to emit light;
the current working interval of the first light-emitting element comprises a first interval and a second interval, the efficiency change of the second interval is relatively stable compared with the efficiency change of the first interval, and the current of the second interval is larger than that of the first interval; the first light-emitting element works in the second interval; a second pixel including a second pixel circuit and a second light emitting element, the second pixel circuit being for driving the second light emitting element to emit light;
wherein the efficiency change of the current working interval of the second light emitting element is relatively stable compared with the efficiency change of the first interval of the first light emitting element; in one frame, the light-emitting time of the first pixel is shorter than that of the second pixel; the first pixels include green pixels and the second pixels include blue pixels and/or red pixels.
2. The display panel according to claim 1, further comprising:
a first light emission control signal line electrically connected to the first pixel; the first light-emitting control signal line is used for controlling the light-emitting time of the first pixel;
a second light emission control signal line electrically connected to the second pixel; the second light emission control signal line is used for controlling the light emission time of the second pixel.
3. The display panel according to claim 2, wherein a plurality of the first pixels are arranged in a column, and a plurality of the second pixels are arranged in a column;
in the column direction, the first light emission control signal lines and the second light emission control signal lines are alternately arranged; each first light-emitting control signal line is electrically connected with two adjacent rows of the first pixels, and each second light-emitting control signal line is electrically connected with two adjacent rows of the second pixels.
4. The display panel according to claim 3, wherein the first pixel comprises a green pixel; the second pixels include blue pixels and red pixels alternately arranged in a column direction;
each first light-emitting control signal line is electrically connected with two adjacent rows of green pixels, and each second light-emitting control signal line is electrically connected with one adjacent row of blue pixels and one adjacent row of red pixels.
5. The display panel according to claim 2, further comprising:
a first scan line electrically connected to the first pixel; the first scanning line is used for controlling the initialization time of the first pixel;
a second scan line electrically connected to the second pixel; the second scanning line is used for controlling the initialization time of the second pixel;
wherein the initialization time of the first pixel is greater than the initialization time of the second pixel.
6. A display device, comprising: the display panel of any one of claims 1-5.
7. A driving method of a display panel, wherein the display panel includes a first pixel including a first pixel circuit and a first light emitting element; the current working interval of the first light-emitting element comprises a first interval and a second interval, the efficiency change of the second interval is relatively stable compared with the efficiency change of the first interval, and the current of the second interval is larger than that of the first interval;
the driving method includes:
and controlling the first pixel circuit to drive the first light-emitting element to emit light, wherein the first light-emitting element works in the second interval.
8. The method for driving a display panel according to claim 7, wherein the display panel further comprises a second pixel including a second pixel circuit and a second light-emitting element; wherein the efficiency change of the current working interval of the second light emitting element is relatively stable compared with the efficiency change of the first interval of the first light emitting element;
the driving method further includes:
and controlling the second pixel circuit to drive the second light-emitting element to emit light, wherein the light-emitting time of the first pixel is shorter than that of the second pixel in one frame.
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