CN110021265B - Pixel circuit and driving method thereof, display device and driving method - Google Patents

Pixel circuit and driving method thereof, display device and driving method Download PDF

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CN110021265B
CN110021265B CN201910346149.8A CN201910346149A CN110021265B CN 110021265 B CN110021265 B CN 110021265B CN 201910346149 A CN201910346149 A CN 201910346149A CN 110021265 B CN110021265 B CN 110021265B
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data voltage
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CN110021265A (en
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符鞠建
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Shanghai Tianma Microelectronics 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]

Abstract

The invention discloses a pixel circuit and a driving method, a display device and a driving method, wherein the pixel circuit comprises a first data voltage writing module, a second data voltage writing module, a first storage module, a second storage module, a driving transistor and a first light-emitting module, wherein the driving transistor is a double-gate transistor; the driving transistor is used for driving the first light-emitting module to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to the display gray scale of the pixel one by one, and the second data voltage is used for improving the driving current of the driving transistor within a first preset gray scale range; the first predetermined gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale. According to the embodiment of the invention, when the first data voltages corresponding to the display gray scales in a first preset gray scale range are fixed, the driving current of the driving transistor under each gray scale can be increased by adjusting the second data voltage, and the light-emitting brightness of the first light-emitting module in a low gray scale area is increased.

Description

Pixel circuit and driving method thereof, display device and driving method
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit, a driving method, a display device and a driving method.
Background
With the development of display technology, Micro LEDs are used as a new generation of display technology, and are more and more widely applied due to the advantages of higher brightness, better light emitting efficiency and lower power consumption compared with the existing OLEDs.
The Micro LED is a current-driven light emitting device, and the driving method thereof includes active driving and passive driving, and if the active driving method is adopted, the existing conventional pixel circuit can be adopted for driving.
However, when the Micro LED is driven by the conventional pixel circuit, in the low gray scale region, when a data voltage corresponding to a certain gray scale is written into the pixel circuit, the luminance of the Micro LED does not reach the luminance corresponding to the gray scale, which results in a problem that the overall luminance of the display device in the low gray scale region is low.
Disclosure of Invention
The invention provides a pixel circuit, a driving method, a display device and a driving method, which are used for improving the display brightness of the display device in a low gray scale area.
In a first aspect, an embodiment of the present invention provides a pixel circuit, including a first data voltage writing module, a second data voltage writing module, a first storage module, a second storage module, a driving transistor, and a first light emitting module, where the driving transistor is a dual-gate transistor including a first gate and a second gate;
the first data voltage writing module is used for writing a first data voltage into the first grid;
the second data voltage writing module is used for writing a second data voltage into the second grid;
the first storage module is used for storing the voltage of the first grid;
the second storage module is used for storing the voltage of the second grid;
the driving transistor is used for driving the first light-emitting module to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to the display gray scale of the pixel one by one, and the second data voltage is used for improving the driving current of the driving transistor within a first preset gray scale range; the first predetermined gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale.
In a second aspect, an embodiment of the present invention further provides a driving method for driving a pixel circuit, where the pixel circuit includes a first data voltage writing module, a second data voltage writing module, a first storage module, a second storage module, a driving transistor, and a first light emitting module, and the driving transistor is a dual-gate transistor including a first gate and a second gate;
the driving method comprises the following steps:
in the data writing stage, a first data voltage writing module and a second data voltage writing module are controlled to be conducted, a first data voltage is written into a first grid electrode through the conducted first data voltage writing module, a second data voltage is written into a second grid electrode through the conducted second data voltage writing module, the first data voltage corresponds to the display gray scale of the pixel one by one, and the second data voltage is used for improving the driving current of the driving transistor within a first preset gray scale range; wherein the first predetermined gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale;
and in the light emitting stage, the driving transistor drives the first light emitting module to emit light according to the first data voltage and the second data voltage.
In a third aspect, an embodiment of the present invention further provides a display device, including a display panel and a driving chip electrically connected to the display panel, where the display panel includes the pixel circuit provided in the first aspect as a first pixel circuit, and the first pixel circuit includes a first data voltage input terminal, a second data voltage input terminal, a first scan signal input terminal, a second scan signal input terminal, a first voltage signal input terminal, and a second voltage input terminal; the first data voltage input end is electrically connected with the input end of the first data voltage writing module, the first scanning signal input end is electrically connected with the control end of the first data voltage writing module, and the output end of the first data voltage writing module is electrically connected with the first grid electrode of the driving transistor; the second data voltage input end is electrically connected with the input end of the second data voltage writing module, the second scanning signal input end is electrically connected with the control end of the second data voltage writing module, and the output end of the second data voltage writing module is electrically connected with the second grid electrode of the driving transistor;
the display device further includes:
the first data voltage input end is electrically connected with the driving chip through the corresponding data line, and the second data voltage input end is electrically connected with the driving chip through the corresponding data line;
the scanning driving circuit comprises a scanning driving circuit and a plurality of scanning lines which are electrically connected with a plurality of output ends of the scanning driving circuit in a one-to-one correspondence mode, wherein a first scanning signal input end is electrically connected with the scanning driving circuit through the scanning line corresponding to the first scanning signal input end, and a second scanning signal input end is electrically connected with the scanning driving circuit through the scanning line corresponding to the second scanning signal input end.
In a fourth aspect, an embodiment of the present invention further provides a driving method of a display device, for driving the display device provided in the third aspect, where the driving method includes:
in a data writing stage, a first data voltage writing module and a second data voltage writing module are conducted, a first data voltage is written into a first grid electrode, a second data voltage is written into a second grid electrode, the first data voltage corresponds to the display gray scale of a pixel one by one, and the second data voltage is used for increasing the driving current of a driving transistor in a first preset gray scale range; wherein the first predetermined gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale;
and in the light emitting stage, the driving transistor drives the light emitting module to emit light according to the first data voltage and the second data voltage.
According to the pixel circuit and the driving method thereof, the display device and the driving method thereof, the driving transistor in the pixel circuit is set to be the double-gate transistor, and the driving transistor drives the first light-emitting module to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to the display gray scales of the pixels one by one, and for each display gray scale in a first preset gray scale range, when the first data voltage corresponding to each display gray scale one by one is fixed, the driving current of the driving transistor under each gray scale can be increased by adjusting the second data voltage, so that the light-emitting brightness of the first light-emitting module in a low gray scale region is increased, the phenomenon that the light-emitting brightness of the Micro LED in the low gray scale region is low can be improved, and the display effect is improved.
Drawings
FIG. 1 is a graph of the luminous efficiency versus current density for red, green, and blue sub-pixels of a Micro LED according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 3 is a graph of a second gate voltage of the driving transistor versus a threshold voltage of the driving transistor according to an embodiment of the present invention;
FIG. 4 is a graph of the gate-source voltage difference and the driving current of the driving transistor according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 7 is a timing diagram illustrating operation of a pixel circuit according to an embodiment of the present invention;
FIG. 8 is a timing diagram illustrating another operation of a pixel circuit according to an embodiment of the present invention;
FIG. 9 is a timing diagram illustrating another operation of a pixel circuit according to an embodiment of the present invention;
fig. 10 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of another display device provided in an embodiment of the invention;
fig. 13 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of another display device provided in an embodiment of the present invention;
fig. 15 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of a second pixel circuit 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 art, when the conventional pixel circuit is used to drive the Micro LED, in a low gray scale region displayed on the display panel (specifically, a certain gray scale region greater than or equal to 0 gray scale and less than or equal to 32 gray scale, in other words, a region where a pixel with a luminance greater than or equal to 0 gray scale and less than or equal to 32 gray scale is located on the display panel), when a data voltage corresponding to a certain gray scale is written into the pixel circuit, the actual luminance of the Micro LED does not reach the luminance corresponding to the gray scale, which causes a problem that the existing display luminance at the same voltage is lower than the target display luminance corresponding to the gray scale, it should be noted that the low gray scale region does not refer to a certain part or a certain region of the display panel, but refers to a gray scale value between 0 gray scale and 32 gray scale when any pixel included in the display panel emits light when the display panel displays, for example, if the display gray scale of a certain pixel in the display panel at a certain time is 16 gray scales, the display gray scale (16 gray scales) of the pixel at the certain time is in the low gray scale region of the gray scale displayed by the pixel. In other words, the low gray scale region is a display region having gray scale values of 0 gray scale to 32 gray scale on the gray scale coordinate axis.
In a conventional pixel circuit, a driving transistor for driving a Micro LED to emit light is usually a single-gate transistor, a data voltage written in a gate of the driving transistor determines a magnitude of a driving current, and the magnitude of the driving current affects a light emitting brightness of the Micro LED. In a conventional display device, data voltages corresponding to respective gray scales are stored in a driver chip, and when a Micro LED displays a certain gray scale, the driver chip outputs the data voltage corresponding to the gray scale to a gate of a driver transistor. However, the inventors have found that the light emission luminance of the Micro LED is related not only to the driving current flowing through the Micro LED but also to the light emission efficiency of the Micro LED. Fig. 1 is a graph of the relationship between the luminous efficiency and the current density of the red, green and blue sub-pixels of the Micro LED provided in the embodiment of the present invention, wherein the current density is the current density of the driving current flowing through the light emitting device in the sub-pixel; referring to fig. 1, the low gray scale region 510 has a current density of 0-0.01, which corresponds to the gray scale displayed by the pixel, and the gray scale displayed by the pixel gradually increases with the increase of the current density. Referring to fig. 1, the overall light emitting efficiency of the red, green and blue sub-pixels of the Micro LED in the low gray scale region is relatively low, so that even when the data voltage written in the gate of the driving transistor reaches the data voltage corresponding to the gray scale to be displayed, the existing display brightness of the light emitting device cannot reach the target display brightness corresponding to the gray scale to be displayed, and finally the overall brightness of the display device in the low gray scale region is relatively low. It should be noted that the conventional display brightness is the brightness of the light emitted by the Micro LED when a certain voltage is written in the low gray scale region, and the conventional display brightness is related to the driving current and also related to the light emitting efficiency of the Micro LED; the target display luminance is the light emission luminance of the Micro LED in the low gray scale region, regardless of the influence of the light emission efficiency of the Micro LED at the same voltage.
In view of the above problems, an embodiment of the present invention provides a pixel circuit, and fig. 2 is a schematic structural diagram of a pixel circuit provided in an embodiment of the present invention, and referring to fig. 2, the pixel circuit includes a first data voltage writing module 110, a second data voltage writing module 120, a first storage module 130, a second storage module 140, a driving transistor DT and a first light emitting module 150, the driving transistor DT is a double-gate transistor including a first gate G1 and a second gate G2; fig. 2 illustrates the driving transistor DT as a P-type transistor;
the first data voltage writing module 110 is configured to write a first data voltage to the first gate G1;
the second data voltage writing module 120 is configured to write a second data voltage to the second gate G2;
the first storage module 130 is used for storing the voltage of the first gate G1;
the second storage module 140 is used for storing the voltage of the second gate G2;
the driving transistor DT is used for driving the first light emitting module 150 to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to the display gray scale of the pixel one by one, and the second data voltage is used for improving the driving current of the driving transistor DT within a first preset gray scale range; the first predetermined gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale.
The first preset gray scale range may include a plurality of display gray scales, and the first preset gray scale range may be a gray scale range pre-stored in the driver chip, and the driver chip is a driver chip in the display device including the pixel circuit provided in this embodiment, as described above, the first preset gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale. When a conventional pixel circuit is used for driving the Micro LED, in a low gray scale region (specifically, a gray scale region greater than or equal to 0 gray scale and less than or equal to 32 gray scale), when a data voltage corresponding to a certain gray scale is written into the pixel circuit, the light emitting luminance of the Micro LED does not reach the luminance corresponding to the gray scale, so that the existing display luminance at the same voltage is lower than the target display luminance corresponding to the gray scale. Therefore, the first predetermined gray scale range may be selected to be greater than or equal to 0 gray scale and less than or equal to 32 gray scale, so that the second data voltage is used to increase the driving current of the driving transistor DT within the range greater than or equal to 0 gray scale and less than or equal to 32 gray scale, so that the actual display brightness of the Micro LED may reach the target display brightness corresponding to the gray scale in the low gray scale region. It should be noted that the actual display brightness of the Micro LED is the display brightness after the compensation is performed after the influence of the luminous efficiency of the Micro LED on the display brightness is considered.
Wherein, the light emitting module may be a Micro LED. Specifically, the driving transistor DT is a double-gate transistor, and calculates a formula according to a driving current
Figure BDA0002042341410000081
Wherein Cox is the gate oxide capacitance (capacitance per unit area of gate oxide), μ is the carrier mobility,
Figure BDA0002042341410000082
in order to obtain the width-to-length ratio of the driving transistor DT, VGS is the voltage difference between the gate and the source of the driving transistor DT, VG is the gate voltage of the driving transistor DT (in this embodiment, the voltage of the first gate G1 of the driving transistor DT), VS is the source voltage of the driving transistor DT, and Vth is the threshold voltage of the driving transistor DT. Here, a fixed voltage is generally input to the source of the driving transistor DT, and thus the current of the driving transistor DT is related to the threshold voltage of the driving transistor DT and the gate voltage of the driving transistor DT.
In the embodiment of the present invention, the driving transistor DT is a double gate transistor, wherein the first data voltage value written into the first gate G1 of the driving transistor DT is equivalent to the gate voltage of the driving transistor DT in the current calculation formula, and the threshold voltage of the driving transistor DT is related to the magnitude of the second gate G2 voltage of the driving transistor DT. Fig. 3 is a diagram of the relationship between the second gate voltage of the driving transistor and the threshold voltage of the driving transistor according to the embodiment of the invention. Fig. 3 corresponds to the case that the driving transistor DT is a P-type transistor, and referring to fig. 3, the purpose of adjusting the threshold voltage of the driving transistor DT can be achieved by adjusting the voltage of the second gate G2, i.e. by adjusting the second data voltage. Fig. 4 is a graph of a relationship between a gate-source voltage difference and a driving current of a driving transistor according to an embodiment of the present invention, where a curve 10 and a curve 20 in fig. 4 correspond to two current curves with different threshold voltages, respectively, and referring to fig. 4, when the currents of the driving transistors DT with different threshold voltages are different when the currents correspond to the same gate-source voltage difference (since the source voltage is usually a fixed value, i.e., correspond to the same voltage of the first gate G1, i.e., correspond to the same voltage of the first data), for example, Vgs1 in fig. 4. As a result of the above analysis, it is understood that the threshold voltage of the driving transistor DT can be adjusted by adjusting the second data voltage written to the second gate G2 by providing the driving transistor DT as a double gate transistor, and the driving current can be further adjusted when the first data voltage written to the first gate G1 is fixed. For the problem of low luminance in the low gray scale region of the Micro LED in the prior art, the driving current can be increased by writing the specific second data voltage into the second gate G2 of the driving transistor DT, so as to increase the luminance in the low gray scale region of the Micro LED.
In the embodiment of the invention, the maximum of the first predetermined gray scale range is 0-128 gray scale, so that the low gray scale region is necessarily included in the first predetermined gray scale range. In the first preset gray scale range, the magnitude of the driving current of the driving transistor DT is controlled by the first data voltage written into the first gate G1 and the second data voltage written into the second gate G2, and the driving current of the driving transistor DT is increased by the second data voltage, so that the light emitting brightness of the Micro LED in the low gray scale region can be increased, and the display effect is improved.
Also, by adjusting the threshold voltage of the driving transistor by changing the voltage of the second gate G2, the driving current to the Micro LED can be changed in different gradients. The conventional display device includes a driving chip, the driving chip includes data voltage output terminals, the data voltage output terminals are electrically connected to the first data voltage writing module 110 in the pixel circuit to provide data voltages to the first data voltage writing module 110 in the pixel circuit, and the accuracy of the data voltage output from each data voltage output terminal is constant, for example, the accuracy of the data voltage output terminal of the driving chip is 0.1V, so that the display is performedIn this embodiment, the first data voltage written into the first gate G1 of the driving transistor DT by the data voltage writing module 110 may be increased or decreased with a gradient of 0.1V, corresponding to the driving current calculation formula
Figure BDA0002042341410000091
VG increases or decreases with a gradient of 0.1V, and accordingly, the change gradient of the driving current is 0.01A. However, the first data voltage variation value of 0.1V may correspond to different gray levels. Therefore, for a certain fixed gray scale, by adjusting the second data voltage written into the second gate G2 according to the relationship between the second gate voltage of the driving transistor DT and the threshold voltage of the driving transistor in fig. 3, and further adjusting the driving current by the threshold voltage of the second data voltage adjusting transistor, the threshold voltage changes following the second data voltage, since the variation range of the second data voltage is larger than the variation range of the threshold voltage of the transistor, it can be obtained according to the corresponding relationship in fig. 3 that the variation gradient of the threshold voltage value is smaller than that of the second data voltage value, and further the driving current changes following the threshold voltage, the variation gradient of the driving current is reduced, and a small gradient variation of the driving current is realized, for example, when the threshold voltage of the second data voltage adjusting driving transistor is increased or decreased by 0.01V, the corresponding change gradient of the drive current was 0.0001A. Under the condition of ensuring that the display gray scale is unchanged, the driving current can be adjusted by smaller gradient so as to increase or reduce the display brightness and compensate the influence of a low gray scale area on the luminous efficiency of the pixel; in other words, with the present embodiment, the driving voltage can be used to adjust the driving current, and meanwhile, the gradient of the change of the driving current is reduced without changing the gradient of the driving voltage, so that the change of the small gradient of the driving current is realized; therefore, even if the pixels are maintained at the same gray scale, different driving currents can be correspondingly obtained, so that the driving current can be changed in a small amplitude under the condition that the adjustment precision of the driving voltage is not required to be improved, and the display brightness of the pixels under the fixed display gray scale is changed to achieve the target brightness. For example, the original 32 gray levels can only correspond to the first data voltage of 1.0V when the first numberWhen the voltage is adjusted to 0.9V or 1.1V, the corresponding gray scale is no longer 32 gray scale, and the first data voltage of 1.0V causes the existing display brightness of the Micro LED to be low because the light emitting efficiency of the Micro LED in the low gray scale region is low. After the driving transistor DT is set to be a dual-gate transistor, the second data voltage written into the second gate G2 can be adjusted, for example, according to the relationship between the second data voltage and the threshold voltage of the driving transistor DT, the threshold voltage of the driving transistor DT can be changed in a gradient of 0.01V by adjusting the second data voltage, the second data voltage written into the second gate G2 is controlled, the first light-emitting module 150 is driven to emit light according to the first data voltage and the second data voltage, the driving current in the first preset gray scale range can be increased, so that the display brightness under the display gray scale is increased, the problem that the existing display brightness is insufficient in a low gray scale region due to insufficient light-emitting efficiency is solved, the actual display brightness is guaranteed to reach the target display brightness under the display gray scale, and the phenomenon that the light-emitting brightness of the Micro LED is low in the low gray scale region is improved, the display effect is improved. .
Note that the Vdd input voltage is higher than the Vss input voltage in fig. 2. FIG. 2 corresponds to the driving transistor being a P-type transistor, and the first voltage input terminal is Vdd at this time. The driving transistor DT may be an N-type transistor, and when the driving transistor is an N-type transistor, Vss is a first voltage signal input terminal, and both ends of the first memory block 130 and the second memory block 140 are electrically connected to the first gate G1 and Vss of the driving transistor DT, respectively.
According to the pixel circuit provided by the embodiment of the invention, the driving transistor in the pixel circuit is a double-gate transistor, and the driving transistor drives the first light-emitting module to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to the display gray scales of the pixels one by one, and for each display gray scale in a first preset gray scale range, when the first data voltage corresponding to each display gray scale one by one is fixed, the driving current of the driving transistor under each gray scale can be increased by adjusting the second data voltage, so that the light-emitting brightness of the first light-emitting module in a low gray scale region is increased, the phenomenon that the light-emitting brightness of the Micro LED in the low gray scale region is low can be improved, and the display effect is improved. It should be noted that the improvement of the luminance refers to further adjusting the driving current of the driving transistor with a small gradient through the second data voltage under the condition of ensuring that the display gray scale of the region does not change, so as to improve the display effect and compensate the insufficient display brightness of the low gray scale region.
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. 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.
With continued reference to fig. 2, based on the above scheme, optionally, the first data voltage writing module 110 includes an input terminal, an output terminal, and a control terminal, the input terminal of the first data voltage writing module 110 is electrically connected to the first data voltage input terminal Vdata1 of the pixel circuit, the output terminal of the first data voltage writing module 110 is electrically connected to the first gate G1 of the driving transistor DT, and the control terminal of the first data voltage writing module 110 is electrically connected to the first Scan signal input terminal Scan1 of the pixel circuit;
the second data voltage writing module 120 includes an input terminal, an output terminal, and a control terminal, the input terminal of the second data voltage writing module 120 is electrically connected to the second data voltage input terminal Vdata2 of the pixel circuit, the output terminal of the second data voltage writing module 120 is electrically connected to the second gate G2 of the driving transistor DT, and the control terminal of the second data voltage writing module 120 is electrically connected to the second Scan signal input terminal Scan2 of the pixel circuit;
a first pole of the driving transistor DT is electrically connected to a first voltage signal input terminal Vdd of the pixel circuit, a second pole of the driving transistor DT is electrically connected to a first end of the first light emitting module 150, and a second end of the first light emitting module 150 is electrically connected to a second voltage signal input terminal Vss of the pixel circuit;
two ends of the first memory module 130 are electrically connected to the first gate G1 and the first voltage signal input terminal Vdd, respectively;
the two ends of the second memory module 140 are electrically connected to the second gate G2 and the first voltage signal input terminal Vdd, respectively.
Specifically, when the pixel circuit operates, the operation timing can be divided into a data writing stage and a light emitting stage. In the data writing phase, the first data voltage writing module 110 and the second data voltage writing module 120 are turned on, the first data voltage is written into the first gate G1 through the turned-on first data voltage writing module 110, the second data voltage is written into the second gate G2 through the turned-on second data voltage writing module 120, and the first data voltage and the second data voltage can be stored in the first storage module 130 and the second storage module 140, respectively. In the light emitting phase, the driving transistor DT drives the first light emitting module 150 to emit light according to the first and second data voltages.
According to the pixel circuit provided by the embodiment of the invention, the driving transistor in the pixel circuit is a double-gate transistor, and the driving transistor drives the first light-emitting module to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to the display gray scales of the pixels one by one, and for each display gray scale in a first preset gray scale range, when the first data voltage corresponding to each display gray scale one by one is fixed, the driving current of the driving transistor under each gray scale can be increased by adjusting the second data voltage, so that the light-emitting brightness of the first light-emitting module in a low gray scale region is increased, the phenomenon that the light-emitting brightness of the Micro LED in the low gray scale region is low can be improved, and the display effect is improved.
Fig. 5 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, and referring to fig. 5, the pixel circuit further includes a light-emitting control module 160, a control terminal N of the light-emitting control module 160 is used for inputting a light-emitting control signal, a first terminal of the light-emitting control module 160 is electrically connected to the second electrode of the driving transistor DT, and a second terminal of the light-emitting control module 160 is electrically connected to the first terminal of the first light-emitting module 150.
Specifically, when the pixel circuit works, in the data writing stage, the light-emitting control module 160 is turned off, and in the light-emitting stage after the data writing stage, the light-emitting control module 160 is turned on, so that the first light-emitting module 150 can emit light only in the light-emitting stage, and poor display caused by false light emission of the first light-emitting module 150 when the writing of the first data voltage into the first gate G1 and/or the writing of the second data voltage into the second gate G2 is not completed is avoided.
Fig. 6 is a schematic structural diagram of another pixel circuit according to an embodiment of the invention, and referring to fig. 6, the first data voltage writing module 110 includes a first transistor T1, the second data voltage writing module 120 includes a second transistor T2, the first memory module 130 includes a first capacitor C1, the second memory module 140 includes a second capacitor C2, and the light-emitting control module 160 includes at least a third transistor T3;
a gate of the first transistor T1 is used as a control terminal of the first data voltage writing module 110, a first pole of the first transistor T1 is used as an input terminal of the first data voltage writing module 110, and a second pole of the first transistor T1 is used as an output terminal of the first data voltage writing module 110;
a gate of the second transistor T2 is used as a control terminal of the second data voltage writing module 120, a first pole of the second transistor T2 is used as an input terminal of the second data voltage writing module 120, and a second pole of the second transistor T2 is used as an output terminal of the second data voltage writing module 120;
a gate of the third transistor T3 is used as a control terminal of the light emission control module 160, a first pole of the third transistor T3 is used as a first terminal of the light emission control module 160, and a second pole of the third transistor T3 is used as a second terminal of the light emission control module 160;
two plates of the first capacitor C1 are used as two terminals of the first memory module 130, and two plates of the second capacitor C2 are used as two terminals of the second memory module 140.
The first light emitting module 150 may be a Micro LED device D1. The operation timing of the pixel circuit may include a data writing stage and a light emitting stage. In the following description, the first transistor T1, the second transistor T2, the third transistor T3 and the driving transistor DT are P-type transistors, where Vdd is used as the first voltage signal input terminal, two ends of the first capacitor C1 are electrically connected to the first gate G1 of the driving transistor DT and the first voltage signal input terminal Vdd, respectively, and two ends of the second capacitor C2 are electrically connected to the first gate G2 of the driving transistor DT and the first voltage signal input terminal Vdd, respectively.
In the data writing phase, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 input low level signals, the control terminal of the third transistor T3 inputs high level signals, the first transistor T1 and the second transistor T2 are turned on, the third transistor T3 is turned off, and the first data voltage and the second data voltage are written to the first gate G1 and the second gate G2 of the driving transistor DT through the turned-on first transistor T1 and the turned-on second transistor T2, respectively.
In the light emitting stage, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 input high level signals, the control terminal of the third transistor T3 inputs low level signals, the first transistor T1 and the second transistor T2 are turned off, the third transistor T3 is turned on, and the driving current generated by the driving transistor DT drives the first light emitting module 150 to emit light.
Fig. 7 is an operation timing diagram of the pixel circuit according to the embodiment of the invention, the operation timing may correspond to the pixel circuit shown in fig. 7, referring to fig. 6 and 7, in the data writing phase T1, the low level signal is simultaneously input to the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2, the first transistor T1 and the second transistor T2 are simultaneously turned on, and the writing of the first data voltage to the first gate G1 and the writing of the second data voltage to the second gate G2 are simultaneously performed.
In the light emitting period T2, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 input high level signals, the control terminal of the third transistor T3 inputs low level signals, the first transistor T1 and the second transistor T2 are turned off, the third transistor T3 is turned on, and the driving current generated by the driving transistor DT drives the first light emitting module 150 to emit light.
Since the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 simultaneously input low level signals, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 can be connected to the same Scan line, and the number of Scan lines is not increased for the entire display device, which is favorable for wiring.
According to the pixel circuit provided by the embodiment of the invention, the driving transistor in the pixel circuit is a double-gate transistor, and the driving transistor drives the first light-emitting module to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to the display gray scales of the pixels one by one, when the first data voltage corresponding to each display gray scale in a first preset gray scale range is fixed, the driving current of the driving transistor under each gray scale can be increased by adjusting the second data voltage, the driving current of the driving transistor is adjusted in a small gradient manner, the light emitting brightness of the first light emitting module in a low gray scale region is increased, the phenomenon that the light emitting brightness of the Micro LED in the low gray scale region is low can be improved, and the display effect is improved.
Fig. 8 is another operation timing diagram of the pixel circuit according to the embodiment of the invention, the operation timing diagram may correspond to the pixel circuit shown in fig. 8, referring to fig. 6 and 8, the data writing phase T1 includes a first phase T11 and a second phase T12, in the first phase T11, the first Scan signal input terminal Scan1 inputs a low level signal, the first transistor T1 is turned on, and the first data voltage is written into the first gate G1 of the driving transistor DT; the second Scan signal input terminal Scan2 inputs a high level signal, and the second transistor T2 is turned off;
in the second stage T12, the first Scan signal input terminal Scan1 inputs a high level signal, and the first transistor T1 is turned off; the second Scan signal input terminal Scan2 inputs a low level signal, the second transistor T2 is turned on, and the second data voltage is written into the second gate G2.
In the light emitting period T2, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 input high level signals, the control terminal of the third transistor T3 inputs low level signals, the first transistor T1 and the second transistor T2 are turned off, the third transistor T3 is turned on, and the driving current generated by the driving transistor DT drives the first light emitting module 150 to emit light.
Fig. 9 is another operation timing diagram of the pixel circuit according to the embodiment of the invention, the operation timing diagram can correspond to the pixel circuit shown in fig. 5, and referring to fig. 6 and fig. 9, in the first phase T11, the first Scan signal input terminal Scan1 inputs a high level signal, and the first transistor T1 is turned off; the second Scan signal input terminal Scan2 inputs a low level signal, the second transistor T2 is turned on, and the second data voltage is written into the second gate G2;
in the second stage T12, the first Scan signal input terminal Scan1 inputs a low level signal, the first transistor T1 is turned on, and the first data voltage is written into the first gate G1 of the driving transistor DT; the second Scan signal input terminal Scan2 inputs a high level signal, and the second transistor T2 is turned off.
In the light emitting period T2, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 input high level signals, the control terminal of the third transistor T3 inputs low level signals, the first transistor T1 and the second transistor T2 are turned off, the third transistor T3 is turned on, and the driving current generated by the driving transistor DT drives the first light emitting module 150 to emit light.
In the operation timings of the pixel circuits shown in fig. 8 and 9, the first transistor T1 and the second transistor T2 are not turned on at the same time, and the first transistor T1 and the second transistor T2 can be independently controlled.
An embodiment of the present invention further provides a driving method of a pixel circuit, where the driving method may be used to drive the pixel circuit provided in any of the above embodiments of the present invention, and fig. 10 is a flowchart of the driving method of the pixel circuit provided in the embodiment of the present invention, where the pixel circuit includes a first data voltage writing module, a second data voltage writing module, a first storage module, a second storage module, a driving transistor and a first light emitting module, and the driving transistor is a dual-gate transistor including a first gate and a second gate; referring to fig. 10, the driving method of the pixel circuit includes:
step 210, in a data writing stage, controlling a first data voltage writing module and a second data voltage writing module to be conducted, wherein the first data voltage is written into a first grid electrode through the conducted first data voltage writing module, and the second data voltage is written into a second grid electrode through the conducted second data voltage writing module, wherein the first data voltage corresponds to display gray scales of pixels one to one, and the second data voltage is used for increasing driving current of a driving transistor in a first preset gray scale range; wherein the first predetermined gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale;
in the step 220, in the light emitting stage, the driving transistor drives the first light emitting module to emit light according to the first data voltage and the second data voltage.
In the driving method of the pixel circuit provided by the embodiment of the invention, the first data voltage writing module and the second data voltage writing module are controlled to be conducted in the data writing stage, the first data voltage is written into the first grid electrode through the conducted first data voltage writing module, and the second data voltage is written into the second grid electrode through the conducted second data voltage writing module, wherein the first data voltage and the display gray scale of the pixel are in one-to-one correspondence, and the second data voltage is used for improving the driving current of the driving transistor in the first preset gray scale range; the first preset gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale, so that for each display gray scale in the first preset gray scale range, when the first data voltage corresponding to each display gray scale one by one is fixed, the driving current of the driving transistor under each gray scale can be increased by adjusting the second data voltage, the light-emitting brightness of the first light-emitting module in the low gray scale area is increased, the phenomenon that the light-emitting brightness of the Micro LED in the low gray scale area is low can be improved, and the display effect is improved.
On the basis of the above scheme, optionally, the pixel circuit further includes a light-emitting control module, a control end of the light-emitting control module is used for inputting a light-emitting control signal, a first end of the light-emitting control module is electrically connected with the second electrode of the driving transistor, and a second end of the light-emitting control module is electrically connected with the first end of the first light-emitting module; the driving method of the pixel circuit includes:
in the data writing stage, controlling the light-emitting control module to be switched off;
and in the light-emitting stage, controlling the light-emitting control module to be conducted.
The light-emitting control module is controlled to be turned off in the data writing stage; in the light-emitting stage, the light-emitting control module is controlled to be switched on, so that the first light-emitting module can emit light only in the light-emitting stage, and poor display caused by mistaken light emission of the first light-emitting module when the first data voltage is written into the first grid and/or the second data voltage is not written into the second grid is avoided.
On the basis of the foregoing scheme, optionally, in step 210, in the data writing stage, the first data voltage writing module and the second data voltage writing module are turned on, the first data voltage is written into the first gate, and the second data voltage is written into the second gate, including:
step 211, a data writing stage, where the first data writing module and the second data writing module are turned on simultaneously, and the first data voltage and the second data voltage are written into the first gate and the second gate simultaneously.
Because the first data writing module and the second data writing module are simultaneously conducted, the first scanning signal input end and the second scanning signal input end can be connected with the same scanning line, the number of the scanning lines cannot be increased for the whole display device, and wiring is facilitated.
In the driving method of the pixel circuit provided by the embodiment of the invention, the first data voltage writing module and the second data voltage writing module are controlled to be conducted in the data writing stage, the first data voltage is written into the first grid electrode through the conducted first data voltage writing module, and the second data voltage is written into the second grid electrode through the conducted second data voltage writing module, wherein the first data voltage and the display gray scale of the pixel are in one-to-one correspondence, and the second data voltage is used for improving the driving current of the driving transistor in the first preset gray scale range; the first preset gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale, so that for each display gray scale in the first preset gray scale range, when the first data voltage corresponding to each display gray scale one by one is fixed, the driving current of the driving transistor under each gray scale can be increased by adjusting the second data voltage, the light-emitting brightness of the first light-emitting module in the low gray scale area is increased, the phenomenon that the light-emitting brightness of the Micro LED in the low gray scale area is low can be improved, and the display effect is improved.
On the basis of the foregoing scheme, optionally, in step 210, the data writing stage includes a first stage and a second stage, the first data voltage writing module and the second data voltage writing module are turned on, the first data voltage is written into the first gate, and the second data voltage is written into the second gate, including:
step 212, in the first stage, the first data writing module is turned on, the second data writing module is turned off, and the first data voltage is written into the first gate;
step 213, in the second stage, the second data writing module is turned on, the first data writing module is turned off, and the second data voltage is written into the second gate;
or comprises the following steps:
step 214, in the first stage, the second data writing module is turned on, the first data writing module is turned off, and the second data voltage is written into the second gate;
step 215, at the second stage, the first data writing module is turned on, the second data writing module is turned off, and the first data voltage is written into the first gate.
On the basis of the scheme, optionally, the gray scale range of the pixel comprises a first preset gray scale range and a second preset gray scale range, and the second data voltage is a fixed value in the second preset gray scale range; wherein, the lowest gray scale in the second preset gray scale range is higher than the highest gray scale in the first preset gray scale range.
Specifically, since the Micro LED has poor light emitting efficiency only in the low gray scale range, the threshold voltage of the driving transistor is adjusted by the second data voltage in the first preset gray scale range, that is, the maximum range is 0 to 128 gray scales, so as to increase the driving current of the driving transistor, thereby increasing the actual display brightness in the low gray scale range. In addition, the second data voltage may be different for each gray scale within the first predetermined gray scale range. The second predetermined gray scale range may correspond to a relatively higher gray scale range, for example, when the first predetermined gray scale range is 0-128 gray scale, the second predetermined gray scale range may be 129-255 gray scale, and in the second predetermined gray scale range, the problem of poor light emitting efficiency of the Micro LED does not exist, so that the first light emitting module is driven to emit light according to the first data voltage. Therefore, in the second preset gray scale range, the second data voltage is a constant value, that is, the second data voltage corresponding to each gray scale in the second preset gray scale range is the same, that is, in the second preset gray scale range, the threshold voltage of the driving transistor is not required to be adjusted by the second data voltage, and the first light-emitting module can achieve the expected brightness.
Fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention, where the display device includes a display panel 310 and a driving chip 320 electrically connected to the display panel 310, and referring to fig. 11, the display panel 310 includes a plurality of sub-pixels 330, and it is illustrated in fig. 11 that the display panel 310 includes the sub-pixels 330 arranged in an array, and the display panel 310 includes the pixel circuit provided in any of the above embodiments as a first pixel circuit, where the first pixel circuit may refer to fig. 2, and the first pixel circuit includes a first data voltage input terminal Vdata1, a second data voltage input terminal Vdata2, a first Scan signal input terminal Scan1, a second Scan signal input terminal Scan2, a first voltage signal input terminal Vdd, and a second voltage input terminal Vss; the first data voltage input terminal Vdata1 is electrically connected to the input terminal of the first data voltage writing module 110, the first Scan signal input terminal Scan1 is electrically connected to the control terminal of the first data voltage writing module 110, and the output terminal of the first data voltage writing module 110 is electrically connected to the first gate G1 of the driving transistor DT; the second data voltage input terminal Vdata2 is electrically connected to the input terminal of the second data voltage writing module 120, the second Scan signal input terminal Scan2 is electrically connected to the control terminal of the second data voltage writing module 120, and the output terminal of the second data voltage writing module 120 is electrically connected to the second gate G2 of the driving transistor DT; in fig. 11, the first pixel circuit is illustrated with the first data voltage input terminal Vdata2 and the second data voltage input terminal Vdata2 being connected to different data lines, and the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 being connected to different Scan lines;
the display device further includes:
a plurality of data lines (D1, D2, D3 … …) electrically connected to the plurality of output terminals of the driving chip 320 in a one-to-one correspondence, the first data voltage input terminal Vdata1 being electrically connected to the driving chip 320 through the data line corresponding thereto, the second data voltage input terminal Vdata2 being electrically connected to the driving chip 320 through the data line corresponding thereto;
the Scan driving circuit 340 and a plurality of Scan lines (S1, S2, S3 … …) electrically connected to a plurality of output terminals of the Scan driving circuit 340 in a one-to-one correspondence, the first Scan signal input terminal Scan1 is electrically connected to the Scan driving circuit 340 through a Scan line corresponding thereto, and the second Scan signal input terminal Scan2 is electrically connected to the Scan driving circuit 340 through a Scan line corresponding thereto.
It should be noted that fig. 11 only schematically illustrates the first data voltage input terminal Vdata1, the second data voltage input terminal Vdata2, the first Scan signal input terminal Scan1, and the second Scan signal input terminal Scan2 of the first pixel circuit for driving one sub-pixel, and the first data voltage input terminal Vdata1, the second data voltage input terminal Vdata2, the first Scan signal input terminal Scan1, and the second Scan signal input terminal Scan2 of the first pixel circuit for driving the other sub-pixels are similar to the structure illustrated in the sub-pixel. Specifically, when the pixel circuit in the display device operates, the operation timing of the pixel circuit can be divided into a data writing phase and a light emitting phase. In the data writing stage, the scan driving circuit 340 controls the first data voltage writing module and the second voltage data writing module in each first pixel circuit to be turned on row by row, the driving chip 320 inputs data signals to the first data voltage input end Vdata1 and the second data voltage input end Vdata2 of each row of pixels row by row, the first data voltage is written into the first gate of the driving transistor, and the second data voltage is written into the second gate of the driving transistor, wherein the first data voltage corresponds to the display gray scale of the pixel one to one, and the second data voltage is used for increasing the driving current of the driving transistor within the first preset gray scale range.
And in the light emitting stage, the driving transistor drives the light emitting module to emit light according to the first data voltage and the second data voltage.
According to the display device provided by the embodiment of the invention, the driving transistor in the pixel circuit of the display device is a double-gate transistor, and the driving transistor drives the first light-emitting module to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to the display gray scales of the pixels one by one, and for each display gray scale in a first preset gray scale range, when the first data voltage corresponding to each display gray scale one by one is fixed, the driving current of the driving transistor under each gray scale can be increased by adjusting the second data voltage, so that the light-emitting brightness of the first light-emitting module in a low gray scale region is increased, the phenomenon that the light-emitting brightness of the Micro LED in the low gray scale region is low can be improved, and the display effect is improved.
With continued reference to fig. 11, optionally, the first data voltage input Vdata1 and the second data voltage input Vdata2 are electrically connected to different data lines. Specifically, each data line is electrically connected to each output terminal of the driving chip 320, and for a specific output terminal of the driving chip 320, the gradient of the output voltage is constant, and the first data voltage input terminal and the second data voltage input terminal are connected to different data lines, so that the adjustment gradients of the first data voltage and the second data voltage are different, which is more beneficial to controlling the driving current of the driving transistor in the pixel circuit.
Fig. 12 is a schematic structural diagram of another display device according to an embodiment of the present invention, referring to fig. 12, optionally, the first data voltage input terminal Vdata1 and the second data voltage input terminal Vdata2 are electrically connected to the same data line, so that the number of data lines of the display device is not increased, the phenomenon that the light emitting brightness of the Micro LED is low in the low gray scale range is improved, the display effect is improved, and the wiring difficulty is reduced.
It should be noted that fig. 12 only schematically shows the first data voltage input terminal Vdata1, the second data voltage input terminal Vdata2, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 of the first pixel circuit for driving one sub-pixel, and the respective input terminals Vdata1, the second data voltage input terminal Vdata2, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 for driving the other sub-pixels are similar to the structure shown in the sub-pixel.
It should be noted that the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 may also be connected to the same Scan line or different Scan lines, so as to control the timing of writing the first data voltage into the first gate and the timing of writing the second data voltage into the second gate during the data writing phase. In fig. 10 and 11, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 are connected to different Scan lines, so that the writing of the first data voltage and the second data voltage can be sequentially controlled in the data writing phase. Fig. 13 is a schematic structural diagram of another display device according to an embodiment of the invention, fig. 14 is a schematic structural diagram of another display device according to an embodiment of the invention, and referring to fig. 13 and 14, the first Scan signal input terminal Scan1 and the second Scan signal input terminal Scan2 may be connected to the same Scan line, so that the first data voltage and the second data voltage can be controlled to be written simultaneously.
Fig. 15 is a schematic structural diagram of another display device according to an embodiment of the present invention, and based on the above-mentioned scheme, optionally, the display panel 310 further includes a second pixel circuit, and fig. 16 is a schematic structural diagram of the second pixel circuit according to an embodiment of the present invention, referring to fig. 15 and fig. 16, the second pixel circuit includes a third data voltage input terminal Vdata3, a third Scan signal input terminal Scan3, a third voltage signal input terminal Vdd1, a fourth voltage signal input terminal Vss1, a third data voltage writing module 410, a driving module 420, a third memory module 430, and a second light emitting module 440;
the control terminal of the third data voltage writing module 410 is electrically connected to the third Scan signal input terminal Scan3, the first terminal of the third data voltage writing module 410 is electrically connected to the third data voltage input terminal Vdata3, and the second terminal of the third data voltage writing module 410 is electrically connected to the control terminal of the driving module 420;
a first terminal of the driving module 420 is electrically connected to the third voltage signal input terminal Vdd1, a second terminal of the driving module 420 is electrically connected to a first terminal of the second light emitting module 440, and a second terminal of the second light emitting module 440 is electrically connected to the fourth voltage signal input terminal Vss 1;
the first end of the third storage module 430 is electrically connected with the control end of the driving module 420, and the second end of the third storage module 430 is electrically connected with the first end of the driving module 420;
the third data voltage input end Vdata3 is electrically connected with the driving chip 320 through a corresponding data line; the third Scan signal input terminal Scan3 is electrically connected to the Scan driving circuit 340 through its corresponding Scan line.
Specifically, Micro LED pixels typically include red, green, and blue subpixels. With continued reference to FIG. 1, in the low gray scale region 510, the red sub-pixel has the lowest luminous efficiency, the green sub-pixel has the highest luminous efficiency, and the blue sub-pixel has the intermediate luminous efficiency. Therefore, for the sub-pixel with relatively high luminous efficiency in the low gray scale area, for example, the green sub-pixel can be driven by the second pixel circuit, and for the sub-pixel with relatively low luminous efficiency in the low gray scale area, for example, the red sub-pixel and the blue sub-pixel can be driven by the first pixel circuit, so as to increase the driving current in the low gray scale area and improve the brightness of the display. Fig. 15 shows a case where the red sub-pixel column 11 and the blue sub-pixel column 12 are driven by the first pixel driving circuit, and the green sub-pixel column 13 is driven by the second pixel driving circuit. For the sub-pixel driven by the second pixel circuit, the third Scan signal input Scan3 thereof may be connected to the same Scan line as the first Scan signal input Scan1 of the sub-pixel driven by the first pixel circuit; for the sub-pixel driven with the second pixel circuit, the third data voltage input Vdata3 thereof may be connected to the same data line as the first data voltage input Vdata1 of the sub-pixel driven with the first pixel circuit.
On the basis of the above scheme, optionally, the first light emitting module at least includes a red light emitting module, and the second light emitting module 440 at least includes a green light emitting module.
The first light emitting module and the second light emitting module can be Micro LEDs, and the red light emitting module and the green light emitting module can be red and green Micro LED sub-pixels respectively. As analyzed above, for the sub-pixels with relatively high luminous efficiency in the low gray scale region, for example, the green sub-pixel and the blue sub-pixel, the second pixel circuit can be used for driving, and for the sub-pixels with relatively low luminous efficiency in the low gray scale region, for example, the red sub-pixel, the first pixel circuit can be used for driving, so as to increase the driving current in the low gray scale region and increase the brightness of the display. In addition, because the number of devices and signal input ports in the second pixel circuit is small, the display panel including the second pixel circuit can be arranged, and the wiring difficulty of the display panel can be reduced.
An embodiment of the present invention further provides a driving method of a display device, where the driving method is used for the display device provided in any of the above embodiments, and the driving method includes:
in a data writing stage, a first data voltage writing module and a second data voltage writing module are conducted, a first data voltage is written into a first grid electrode, a second data voltage is written into a second grid electrode, the first data voltage corresponds to the display gray scale of a pixel one by one, and the second data voltage is used for increasing the driving current of a driving transistor in a first preset gray scale range; wherein the first predetermined gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale;
and in the light emitting stage, the driving transistor drives the light emitting module to emit light according to the first data voltage and the second data voltage.
In the driving method of the display device provided by the embodiment of the invention, the first data voltage writing module and the second data voltage writing module are controlled to be conducted in the data writing stage, the first data voltage is written into the first grid electrode through the conducted first data voltage writing module, and the second data voltage is written into the second grid electrode through the conducted second data voltage writing module, wherein the first data voltage and the display gray scale of the pixel correspond to each other one by one, and the second data voltage is used for improving the driving current of the driving transistor in the first preset gray scale range; the first preset gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale, so that for each display gray scale in the first preset gray scale range, when the first data voltage corresponding to each display gray scale one by one is fixed, the driving current of the driving transistor under each gray scale can be increased by adjusting the second data voltage, the light-emitting brightness of the first light-emitting module in the low gray scale area is increased, the phenomenon that the light-emitting brightness of the Micro LED in the low gray scale area is low can be improved, and the display effect is improved.
On the basis of the above scheme, optionally, before the data writing stage, the method further includes:
and a gray scale acquisition device is adopted to carry out gray scale test on the display device, and the gray scale acquisition device is electrically connected with the driving chip so as to determine a first data voltage and a second data voltage corresponding to each gray scale.
Specifically, before the display device leaves a factory, the first data voltage and the second data voltage corresponding to each gray scale need to be written into the driving chip, so that when the display device is used, the corresponding first data voltage and the corresponding second data voltage can be determined according to the gray scale of each pixel in a picture to be displayed by the display device, and a good display effect of the display device is ensured.
On the basis of the above scheme, optionally, performing a gray scale test on the display device by using a gray scale obtaining device to determine a first data voltage and a second data voltage corresponding to each gray scale includes:
the scanning driving circuit inputs a scanning signal to the first scanning signal input end through a scanning line, controls the conduction of the first data voltage writing module, and the driving chip provides a first data voltage to the first grid electrode of the driving transistor through the data line and the conducted first data voltage writing module according to a preset first data voltage range corresponding to a preset display gray scale;
the scanning driving circuit inputs a scanning signal to a second scanning signal input end through a scanning line, controls the conduction of the second data voltage writing module, and provides a second data voltage to the second grid electrode of the driving transistor through the data line and the conducted second data voltage writing module according to a preset second data voltage range corresponding to the preset display gray scale;
the driving chip adjusts the first data voltage and/or the second data voltage in a fixed gradient according to the gray scale of the display picture acquired by the gray scale acquisition device and the pre-display gray scale until the gray scale of the display picture acquired by the gray scale acquisition device is the same as the pre-display gray scale, and determines the first data voltage and the second data voltage corresponding to the gray scale as the first data voltage and the second data voltage corresponding to the pre-display gray scale to be stored in the driving chip.
The pre-display gray scale may be a display gray scale corresponding to each sub-pixel in a picture to be displayed by the display device. As a practical matter, each gray level generally corresponds to a first data voltage range and a second data voltage range. When the first data voltage and the second data voltage corresponding to each gray scale are determined, the first data voltage and the second data voltage can be adjusted in a fixed gradient within a first data voltage range and a second data voltage range, and the gray scale of the display device is acquired in real time through the gray scale acquisition device.
Optionally, when the gray scale obtaining device is used for performing gray scale test on the display panel, the display panel of the whole display device can display the same gray scale, so that the test is simpler and more convenient. For example, when determining the first data voltage and the second data voltage corresponding to 32 gray scales, assuming that the first data voltage range is 1.0V-1.3V and the second data voltage range is 0.01V-0.09V according to the actual empirical values, when performing the gray scale test, the first data voltage writing module and the second data voltage writing module are controlled to be turned on, 1.0V and 0.01V are respectively written into the first gate and the second gate of the driving transistor, and the gray scale obtaining device is used to obtain whether the actually displayed gray scale is the same as the pre-displayed gray scale, if not, the second data voltage may be sequentially increased by a gradient of 0.01V, if the actually displayed gray scale is not the same as the pre-displayed gray scale, the first data voltage may be increased by a gradient of 0.1V, for example, the first data voltage may be adjusted to 1.1V, and the second data voltage may be adjusted by the same method on the basis of 1.1V, and determining the first data voltage and the second data voltage as the first data voltage and the second data voltage corresponding to the 32 gray scales until the gray scale acquiring device acquires that the gray scale actually displayed by the display device is the same as the pre-display gray scale. The process is the same for the testing of other gray scales, and is not described herein again.
According to the driving method of the display device, the gray scale obtaining device is used for carrying out gray scale test on the display device, so that the first data voltage and the second data voltage corresponding to each gray scale are obtained, after the first data voltage and the second data voltage corresponding to each gray scale are stored in the driving chip, the display device can determine the fixed first data voltage and the fixed second data voltage according to the pre-displayed gray scale, and the driving transistor drives the first light-emitting module to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to the display gray scale of the pixel one by one, and in a preset gray scale range, the driving current of the driving transistor can be increased by adjusting the second data voltage, so that the luminous brightness of the first luminous module in a low gray scale area is increased, the phenomenon that the luminous brightness of the Micro LED is low in the low gray scale range can be improved, and the display effect is improved.
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 (16)

1. A pixel circuit is characterized by comprising a first data voltage writing module, a second data voltage writing module, a first storage module, a second storage module, a driving transistor and a first light-emitting module, wherein the driving transistor is a double-gate transistor comprising a first gate and a second gate;
the first data voltage writing module is used for writing a first data voltage into the first grid;
the second data voltage writing module is used for writing a second data voltage to the second grid;
the first storage module is used for storing the voltage of the first grid;
the second storage module is used for storing the voltage of the second grid;
the driving transistor is used for driving the first light-emitting module to emit light according to the first data voltage and the second data voltage; the first data voltage corresponds to display gray scales of pixels one by one, and the second data voltage is used for increasing the driving current of the driving transistor within a first preset gray scale range; wherein the first preset gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale;
the gray scale obtaining device is electrically connected with the driving chip to determine the first data voltage and the second data voltage corresponding to each gray scale;
the performing a gray scale test on a display device by using a gray scale obtaining device to determine the first data voltage and the second data voltage corresponding to each gray scale includes:
the driving chip adjusts the first data voltage and/or the second data voltage in a fixed gradient according to the gray scale of the display picture acquired by the gray scale acquisition device and the pre-display gray scale until the gray scale of the display picture acquired by the gray scale acquisition device is the same as the pre-display gray scale, and determines the first data voltage and the second data voltage corresponding to the gray scale as the first data voltage and the second data voltage corresponding to the pre-display gray scale to be stored in the driving chip.
2. The pixel circuit according to claim 1, wherein the first data voltage writing module comprises an input terminal, an output terminal, and a control terminal, the input terminal of the first data voltage writing module is electrically connected to the first data voltage input terminal of the pixel circuit, the output terminal of the first data voltage writing module is electrically connected to the first gate of the driving transistor, and the control terminal of the first data voltage writing module is electrically connected to the first scan signal input terminal of the pixel circuit;
the second data voltage writing module comprises an input end, an output end and a control end, the input end of the second data voltage writing module is electrically connected with the second data voltage input end of the pixel circuit, the output end of the second data voltage writing module is electrically connected with the second grid electrode of the driving transistor, and the control end of the second data voltage writing module is electrically connected with the second scanning signal input end of the pixel circuit;
a first pole of the driving transistor is electrically connected with a first voltage signal input end of the pixel circuit, a second pole of the driving transistor is electrically connected with a first end of the first light-emitting module, and a second end of the first light-emitting module is electrically connected with a second voltage signal input end of the pixel circuit;
two ends of the first storage module are respectively and electrically connected with the first grid and the first voltage signal input end;
and two ends of the second storage module are respectively and electrically connected with the second grid and the first voltage signal input end.
3. The pixel circuit according to claim 2, further comprising a light emission control module, wherein a control terminal of the light emission control module is used for inputting a light emission control signal, a first terminal of the light emission control module is electrically connected to the second terminal of the driving transistor, and a second terminal of the light emission control module is electrically connected to the first terminal of the first light emission module.
4. The pixel circuit according to claim 3, wherein the first data voltage writing module includes a first transistor, the second data voltage writing module includes a second transistor, the first storage module includes a first capacitor, the second storage module includes a second capacitor, and the light emission control module includes at least a third transistor;
a gate of the first transistor is used as a control end of the first data voltage writing module, a first pole of the first transistor is used as an input end of the first data voltage writing module, and a second pole of the first transistor is used as an output end of the first data voltage writing module;
a gate of the second transistor is used as a control end of the second data voltage write-in module, a first pole of the second transistor is used as an input end of the second data voltage write-in module, and a second pole of the second transistor is used as an output end of the second data voltage write-in module;
a gate of the third transistor is used as a control terminal of the light emission control module, a first pole of the third transistor is used as a first terminal of the light emission control module, and a second pole of the third transistor is used as a second terminal of the light emission control module;
two polar plates of the first capacitor are used as two ends of the first storage module, and two polar plates of the second capacitor are used as two ends of the second storage module.
5. The driving method of the pixel circuit is characterized in that the pixel circuit comprises a first data voltage writing module, a second data voltage writing module, a first storage module, a second storage module, a driving transistor and a first light-emitting module, wherein the driving transistor is a double-gate transistor comprising a first gate and a second gate;
the driving method includes:
in the data writing stage, a first data voltage writing module and a second data voltage writing module are controlled to be conducted, a first data voltage is written into the first grid electrode through the conducted first data voltage writing module, a second data voltage is written into the second grid electrode through the conducted second data voltage writing module, the first data voltage corresponds to the display gray scale of the pixel one by one, and the second data voltage is used for increasing the driving current of the driving transistor within a first preset gray scale range; wherein the first preset gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale;
a light emitting stage, wherein the driving transistor drives the first light emitting module to emit light according to the first data voltage and the second data voltage;
the gray scale obtaining device is electrically connected with the driving chip to determine the first data voltage and the second data voltage corresponding to each gray scale;
the performing a gray scale test on a display device by using a gray scale obtaining device to determine the first data voltage and the second data voltage corresponding to each gray scale includes:
the driving chip adjusts the first data voltage and/or the second data voltage in a fixed gradient according to the gray scale of the display picture acquired by the gray scale acquisition device and the pre-display gray scale until the gray scale of the display picture acquired by the gray scale acquisition device is the same as the pre-display gray scale, and determines the first data voltage and the second data voltage corresponding to the gray scale as the first data voltage and the second data voltage corresponding to the pre-display gray scale to be stored in the driving chip.
6. The driving method of the pixel circuit according to claim 5, wherein the pixel circuit further comprises a light emission control module, a control terminal of the light emission control module is used for inputting a light emission control signal, a first terminal of the light emission control module is electrically connected to the second pole of the driving transistor, and a second terminal of the light emission control module is electrically connected to the first terminal of the first light emission module; the driving method includes:
in the data writing stage, controlling the light-emitting control module to be switched off;
and in the light-emitting stage, controlling the light-emitting control module to be conducted.
7. The method according to claim 5, wherein in the data writing phase, the first data voltage writing module and the second data voltage writing module are turned on, the first data voltage is written to the first gate, and the second data voltage is written to the second gate, and the method includes:
in the data writing phase, the first data writing module and the second data writing module are simultaneously turned on, and the first data voltage and the second data voltage are simultaneously written into the first gate and the second gate.
8. The method according to claim 5, wherein the data writing phase includes a first phase and a second phase, the first data voltage writing block and the second data voltage writing block are turned on, the first data voltage is written to the first gate, and the second data voltage is written to the second gate, and the method includes:
in the first stage, the first data writing module is turned on, the second data writing module is turned off, and the first data voltage is written into the first gate; in the second stage, the second data writing module is turned on, the first data writing module is turned off, and the second data voltage is written into the second gate;
or in the first stage, the second data writing module is turned on, the first data writing module is turned off, and the second data voltage is written into the second gate; in the second stage, the first data writing module is turned on, the second data writing module is turned off, and the first data voltage is written into the first gate.
9. The method according to claim 5, wherein the gray scale range of the pixel includes the first predetermined gray scale range and a second predetermined gray scale range, and the second data voltage is constant in the second predetermined gray scale range; and the lowest gray scale in the second preset gray scale range is higher than the highest gray scale in the first preset gray scale range.
10. A display device comprising a display panel and a driver chip electrically connected to the display panel, the display panel comprising the pixel circuit according to any one of claims 1 to 4 as a first pixel circuit, the first pixel circuit comprising a first data voltage input terminal, a second data voltage input terminal, a first scan signal input terminal, a second scan signal input terminal, a first voltage signal input terminal, and a second voltage input terminal; the first data voltage input end is electrically connected with the input end of the first data voltage writing module, the first scanning signal input end is electrically connected with the control end of the first data voltage writing module, and the output end of the first data voltage writing module is electrically connected with the first grid electrode of the driving transistor; the second data voltage input end is electrically connected with the input end of the second data voltage writing module, the second scanning signal input end is electrically connected with the control end of the second data voltage writing module, and the output end of the second data voltage writing module is electrically connected with the second grid electrode of the driving transistor;
the display device further includes:
the first data voltage input end is electrically connected with the driving chip through the corresponding data line, and the second data voltage input end is electrically connected with the driving chip through the corresponding data line;
the scanning driving circuit comprises a scanning driving circuit and a plurality of scanning lines which are electrically connected with a plurality of output ends of the scanning driving circuit in a one-to-one correspondence mode, the first scanning signal input end is electrically connected with the scanning driving circuit through the scanning line corresponding to the first scanning signal input end, and the second scanning signal input end is electrically connected with the scanning driving circuit through the scanning line corresponding to the second scanning signal input end.
11. The display device according to claim 10, wherein the first data voltage input terminal and the second data voltage input terminal are electrically connected to the same data line.
12. The display device according to claim 10, wherein the first data voltage input terminal and the second data voltage input terminal are electrically connected to different ones of the data lines.
13. The display device according to claim 10, wherein the display panel further comprises a second pixel circuit comprising a third data voltage input terminal, a third scan signal input terminal, a third voltage signal input terminal, a fourth voltage signal input terminal, a third data voltage writing module, a driving module, a third storage module, and a second light emitting module;
the control end of the third data voltage writing module is electrically connected with the third scanning signal input end, the first end of the third data voltage writing module is electrically connected with the third data voltage input end, and the second end of the third data voltage writing module is electrically connected with the control end of the driving module;
the first end of the driving module is electrically connected with the third voltage signal input end, the second end of the driving module is electrically connected with the first end of the second light-emitting module, and the second end of the second light-emitting module is electrically connected with the fourth voltage signal input end;
the first end of the third storage module is electrically connected with the control end of the driving module, and the second end of the third storage module is electrically connected with the first end of the driving module;
the third data voltage input end is electrically connected with the driving chip through the data line corresponding to the third data voltage input end; the third scanning signal input end is electrically connected with the scanning driving circuit through the corresponding scanning line.
14. The display device according to claim 13, wherein the first light-emitting module includes at least a red light-emitting module, and the second light-emitting module includes at least a green light-emitting module.
15. A driving method of a display device for driving the display device according to any one of claims 10 to 14, the driving method comprising:
in a data writing stage, the first data voltage writing module and the second data voltage writing module are conducted, first data voltages are written into the first grid electrode, and second data voltages are written into the second grid electrode, wherein the first data voltages correspond to display gray scales of pixels one by one, and the second data voltages are used for increasing driving currents of the driving transistors within a first preset gray scale range; wherein the first preset gray scale range is greater than or equal to 0 gray scale and less than or equal to 128 gray scale;
and in the light emitting stage, the driving transistor drives the light emitting module to emit light according to the first data voltage and the second data voltage.
16. The method according to claim 15, wherein performing a gray scale test on the display device using a gray scale obtaining device to determine the first data voltage and the second data voltage corresponding to each gray scale comprises:
the scanning driving circuit inputs a scanning signal to the first scanning signal input end through the scanning line to control the conduction of a first data voltage writing module, and the driving chip provides a first data voltage to a first grid electrode of the driving transistor through the data line and the conducted first data voltage writing module according to a preset first data voltage range corresponding to a preset display gray scale;
the scanning driving circuit inputs a scanning signal to the second scanning signal input end through the scanning line, controls the second data voltage writing module to be conducted, and provides the second data voltage to the second grid electrode of the driving transistor through the data line and the conducted second data voltage writing module according to a preset second data voltage range corresponding to the pre-display gray scale.
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