CN111785212A - Pixel circuit, driving method thereof and display device - Google Patents
Pixel circuit, driving method thereof and display device Download PDFInfo
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- CN111785212A CN111785212A CN202010776408.3A CN202010776408A CN111785212A CN 111785212 A CN111785212 A CN 111785212A CN 202010776408 A CN202010776408 A CN 202010776408A CN 111785212 A CN111785212 A CN 111785212A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- Control Of El Displays (AREA)
Abstract
The invention provides a pixel circuit, a driving method thereof and a display device, wherein the driving method of the pixel circuit comprises the following steps: acquiring an image to be displayed; determining the gray scale of the image to be displayed at each sub-pixel point position; determining the first data signal input to the first data signal end of the corresponding sub-pixel position and the second data signal input to the second data signal end according to the corresponding relation between the gray scale and the first data signal and the second data signal; and displaying the image to be displayed under the control of the first data signal and the second data signal. The method is used for reducing the complexity of a driving chip of a current driving type display screen while giving consideration to the gray scale depth.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and a display device.
Background
For the current driving type display screen, for example, an Organic Light Emitting Diode (OLED) display screen and a Light Emitting Diode (LED) display screen, if a larger gray scale depth is to be realized to display a more complicated picture, a Data driving chip (Data IC) is required to output more Data voltages with different gray scales.
Therefore, the existing driving mode of the current-driven display screen has the technical problem of low driving efficiency.
Disclosure of Invention
The invention provides a pixel circuit, a driving method thereof and a display device, which are used for reducing the complexity of a driving chip of a current-driven display screen while giving consideration to gray scale depth.
In a first aspect, an embodiment of the present invention provides a pixel circuit, including:
a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, a driving transistor, and a light emitting device;
the driving transistor is a double-gate transistor, a gate of the first switching transistor is coupled to a first scanning signal terminal, a first gate of the first switching transistor is coupled to a first data signal terminal, and a second gate of the first switching transistor is coupled to the first gate of the driving transistor;
a gate of the second switching transistor is coupled to a second scan signal terminal, a first pole of the second switching transistor is coupled to a second data signal terminal, and a second pole of the second switching transistor is coupled to a second gate of the driving transistor;
a first terminal of the first capacitor is coupled to the first gate of the driving transistor, and a second terminal of the first capacitor is coupled to a first constant voltage terminal or a first pole of the driving transistor;
a first end of the second capacitor is coupled with the second grid electrode of the driving transistor, and a second end of the second capacitor is coupled with a second constant voltage end or the first pole of the driving transistor;
the second pole of the driving transistor is coupled with a first power supply end, and the first pole of the driving transistor is coupled with the anode of the light-emitting device;
the cathode of the light emitting device is coupled to a second power supply terminal.
In a possible implementation manner, the first scan signal terminal and the second scan signal terminal are coupled to a same-stage gate driving circuit, and the first data signal terminal and the second data signal terminal are respectively coupled to different data lines.
In a possible implementation manner, the first data signal terminal and the second data signal terminal are coupled to a same data line, and the first scan signal terminal and the second scan signal terminal are respectively coupled to gate driving circuits of different stages.
In a possible implementation manner, the pixel circuit further includes a first compensation circuit coupled to the first data signal terminal, and the first compensation circuit is configured to perform threshold compensation on the first data signal loaded to the first data signal terminal.
In a possible implementation manner, the pixel circuit further includes a second compensation circuit coupled to the second data signal terminal, and the second compensation circuit is configured to perform threshold compensation on a second data signal loaded to the second data signal terminal.
In a second aspect, an embodiment of the present invention provides a display device, including:
a plurality of sub-pixels; wherein each of the sub-pixels comprises a pixel circuit as described above.
In a third aspect, an embodiment of the present invention provides a driving method of a pixel circuit as described above, including:
acquiring an image to be displayed;
determining the gray scale of the image to be displayed at each sub-pixel point position;
determining the first data signal input to the first data signal end of the corresponding sub-pixel position and the second data signal input to the second data signal end according to the corresponding relation between the gray scale and the first data signal and the second data signal;
and displaying the image to be displayed under the control of the first data signal and the second data signal.
In a possible implementation manner, the displaying the image to be displayed under the control of the first data signal and the second data signal includes:
under the action of the first data signal and the second data signal, controlling the light-emitting device of the corresponding sub pixel point to emit light with the brightness larger than a preset threshold value;
and displaying the image to be displayed while the light emitting device emits light with a brightness greater than the preset threshold.
In a possible implementation manner, the displaying the image to be displayed under the control of the first data signal and the second data signal includes:
determining the brightness of the light emitting device corresponding to the sub-pixel under the control of the first data signal and the second data signal;
displaying the image to be displayed while the light emitting device emits light at the luminance.
In a possible implementation manner, after determining the first data signal input to the first data signal terminal of the corresponding sub-pixel position and the second data signal input to the second data signal terminal according to the corresponding relationship between the gray scale and the first data signal and the second data signal, the method further includes:
acquiring a first threshold compensation voltage for performing threshold compensation on the first data signal and a second threshold compensation voltage for performing threshold compensation on the second data signal;
the first threshold compensation voltage and the first data signal are input to the first data signal terminal, and the second threshold compensation voltage and the second data signal are input to the second data signal terminal. The invention has the following beneficial effects:
the embodiment of the invention provides a pixel circuit, a driving method thereof and a display device, wherein the pixel circuit comprises a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, a driving transistor and a light-emitting device, wherein the driving transistor is a double-gate transistor, signals input to a first data signal end and a second data signal end can be respectively adjusted through mutual cooperation of the devices, and further adjustment of gray scale voltage of the driving transistor is realized.
Drawings
FIG. 1 is a schematic diagram of a 2T1C OLED pixel circuit in the related art;
FIG. 2 is a schematic diagram of Id-Vd curves of the pixel circuit of FIG. 1 under different driving voltages Vgs;
fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 5 is a driving timing diagram of the transistors in FIG. 4 that are N-type transistors;
fig. 6 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 7 is a driving timing diagram of the transistors in FIG. 6 with N-type transistors;
fig. 8 is a schematic structural diagram of a pixel circuit including a first compensation circuit according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a pixel circuit including a second compensation circuit according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a pixel circuit including a first compensation circuit and a second compensation circuit according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a display panel including the pixel circuit shown in fig. 11 according to an embodiment of the present invention;
FIG. 13 is a driving timing diagram corresponding to FIG. 11;
fig. 14 is a schematic structural diagram of a display device according to an embodiment of the invention;
fig. 15 is a flowchart of a method for driving a pixel circuit according to an embodiment of the present invention;
fig. 16 is a flowchart of a method of step S104 in a driving method of a pixel circuit according to an embodiment of the present invention;
fig. 17 is a flowchart illustrating a method of step S104 in a driving method of a pixel circuit according to an embodiment of the invention;
fig. 18 is a flowchart of a method of step S103 in a driving method of a pixel circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the word "comprise" or "comprises", and the like, in the context of this application, is intended to mean that the elements or items listed before that word, in addition to those listed after that word, do not exclude other elements or items.
It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
In the prior art, for the current-driven display panel, in order to ensure the display quality, the gray scales of the sub-pixels at different positions need to be adjusted. For example, as shown in fig. 1 of a 2T1C OLED pixel circuit, fig. 2 shows an Id-Vd curve diagram of a driving transistor (DTFT) of the corresponding pixel circuit of fig. 1 under different driving voltages Vgs. Specifically, when the driving transistor (DTFT) operates in the saturation region, different data voltages are written into the data signal terminal, so as to control the magnitude of the driving current Ids of the driving transistor (DTFT), and finally realize the control of the light emitting brightness of the OLED. In order to realize a larger gray scale depth, for example, the gray scale depth is 8 bits, the corresponding gray scale range is 0 to 255, the gray scale depth is 12 bits, and the corresponding gray scale range is 0 to 4095, accordingly, a Data IC is required to output more Data voltages of different gray scales, and for the Data IC, the more gray scales of the output Data voltages, the smaller the voltage difference between adjacent gray scales, the more complex the integrated circuit, and the higher the cost. For example, when V255-V0 is 3V, the voltage difference between adjacent gray scales is 11.76 mV/255V, and when V255-V0 is 2V, the voltage difference between adjacent gray scales is 7.84 mV/255V. For example, the data voltage corresponding to 1 gray scale is 1V, the data voltage corresponding to 2 gray scale is 1.1V, and the data voltage corresponding to 3 gray scale is 1.2V. For example, in the Data IC specification, the voltage adjustable range is 2V-5V, and a step size is also provided, for example, the step size is 0.2 mV. For the control of the existing single data signal terminal, a voltage satisfying 2+0.2mV × N can be obtained. That is, the adjustable range of the data voltage output from only a single data signal terminal is limited, and it is difficult to subdivide more data voltages within the limited range. For example, 512 Data voltages are subdivided in the gray scale range of 0 to 255, and the subdivision degree is finer than 256 Data voltages subdivided in the gray scale range of 0 to 255, and the more complex the integrated circuit of the Data IC is, the higher the cost is.
In addition, in the prior art, because the voltage output by the Data IC is often discontinuous, and there is a difference between voltages of adjacent gray scales, corresponding Ids cannot be obtained by controlling a single Data signal terminal for a part of gray scales, for example, by controlling the single Data signal terminal, the output voltage is a, corresponding Ids is I + c, and gray scale is a, by controlling the single Data signal terminal, the output voltage is B larger than a, corresponding Ids is I +3c, and gray scale is a +2, and Ids of I +2c cannot be obtained by the whole control process for the single Data signal terminal. That is, in the prior art, for a finer gray scale, the required Ids cannot be obtained by only using a single data signal terminal, thereby affecting the display effect of the display device.
In view of this, embodiments of the present invention provide a pixel circuit, a driving method thereof and a display device, which are used to reduce the complexity of a driving chip of a current-driven display panel while considering a gray scale depth.
Fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention, specifically, the pixel circuit includes:
a first switching transistor T1, a second switching transistor T2, a first capacitor C1, a second capacitor C2, a driving transistor DTFT, and a light emitting device L;
the driving transistor DTFT is a dual-gate transistor, the gate of the first switching transistor T1 is coupled to the first Scan signal terminal Scan1, the first gate of the first switching transistor T1 is coupled to the first Data signal terminal Data1, and the second gate of the first switching transistor T1 is coupled to the first gate of the driving transistor DTFT; in a specific implementation process, the first Scan signal terminal Scan1 may be electrically connected to the Gate driving circuit GOA, and may also be electrically connected to the Gate driving chip Gate IC, which is not limited herein. In addition, in a specific implementation, the first gate electrode of the driving transistor DTFT may be a top gate or a bottom gate.
A gate electrode of the second switching transistor T2 is coupled to the second Scan signal terminal Scan2, a first electrode of the second switching transistor T2 is coupled to the second Data signal terminal Data2, and a second electrode of the second switching transistor T2 is coupled to the second gate electrode of the driving transistor DTFT; in a specific implementation process, the second Scan signal terminal Scan2 may be coupled to the Gate driving circuit GOA, and may also be coupled to the Gate driving chip Gate IC. In addition, in a specific implementation, the second gate electrode of the driving transistor DTFT may be a top gate or a bottom gate. In a specific application, when the first grid is a top grid, the second grid is a bottom grid; and when the first grid is a bottom grid, the second grid is a top grid. In a specific implementation process, the first gate and the second gate may be disposed according to a requirement of an actual application, and are not limited herein.
A first terminal of the first capacitor C1 is coupled to the first gate of the driving transistor DTFT, and a second terminal of the first capacitor C1 is coupled to the first constant voltage terminal V1 or the first pole of the driving transistor DTFT; in a specific implementation, the voltage of the first constant voltage terminal V1 may be a voltage with a constant potential, and the first Data signal terminal Data1 may input a Data signal to the first gate of the driving transistor DTFT through the first capacitor C1.
A first terminal of the second capacitor C2 is coupled to the second gate of the driving transistor DTFT, and a second terminal of the second capacitor C2 is coupled to the second constant voltage terminal V2 or the first pole of the driving transistor DTFT; in a specific implementation, the voltage of the second constant voltage terminal V2 may be a voltage with a constant potential, and the second Data signal terminal Data2 may input the Data signal to the second gate of the driving transistor DTFT through the second capacitor C2.
A second electrode of the driving transistor DTFT is coupled to the first power source terminal VDD, and a first electrode of the driving transistor DTFT is coupled to an anode of the light emitting device L;
the cathode of the light emitting device L is coupled to a second power source terminal VSS.
In the embodiment of the present invention, the first switching transistor T1, the second switching transistor T2, and the driving transistor DTFT may be all N-type transistors, or all P-type transistors. In the specific implementation process, when the transistor is an N-type transistor, the transistor is turned on under the action of high potential and is turned off under the action of low potential. In a specific implementation, when the first switching transistor T1, the second switching transistor T2, and the driving transistor DTFT are all N-type transistors, the voltage of the first power terminal VDD may be a high voltage level, the voltage of the second power terminal VSS may be a low voltage level, and the second power terminal VSS may also be grounded.
In the embodiment of the present invention, the first switch Transistor T1, the second switch Transistor T2, and the driving Transistor DTFT may be Thin Film Transistors (TFTs) or Metal Oxide Semiconductor Field Effect Transistors (MOSFETs), which is not limited herein.
In the embodiment of the present invention, the light emitting device L may be an OLED or an LED, and in a specific implementation process, the light emitting device L emits light under the action of the current Ids when the driving transistor DTFT is in a saturated state. Specifically, when the voltage applied across the light emitting device L is greater than or equal to the threshold voltage, the light emitting device L realizes light emission by the current Ids when the driving transistor DTFT is in the saturation state.
In the embodiment of the present invention, the first pole and the second pole of the first switch transistor T1 may have different functions according to the type of the switch transistor and the signal of the signal terminal, for example, the first pole may be a source, the second pole may be a drain, and the first pole may be a drain, and the second pole may be a source, which is not limited herein.
In the embodiment of the present invention, the first pole and the second pole of the driving transistor DTFT may also have different functions according to the type and the signal of the signal terminal, for example, the first pole may be a source, the second pole may be a drain, the first pole may be a drain, and the second pole may be a source, which is not limited herein.
In the embodiment of the present invention, since the driving transistor DTFT is a dual gate transistor, the first Data signal can be input to the first Data signal terminal Data1, and the second Data signal can be input to the second Data signal terminal Data2, so as to realize the control of the gray scale voltage of the first gate and the second gate of the driving transistor DTFT. For example, when displaying an image to be displayed, 200 gray levels are required, the control of the first Data signal terminal Data1 can realize rough division of 100 gray levels, the control of the second Data signal terminal Data2 can realize fine division of 2 gray levels, the control of the first Data signal terminal Data1 can realize rough division of 50 gray levels, and the control of the second Data signal terminal Data2 can realize fine division of 4 gray levels. Compared with the current method that a single data signal terminal needs 200 parts of gray scales, the method has more various adjusting modes, and can reduce the complexity of a data driving chip while considering the depth of the gray scales.
In the embodiment of the present invention, since the driving transistor DTFT is a dual gate transistor, the control of M Data voltages is realized by inputting the first Data signal to the first Data signal terminal Data1, and the control of N Data voltages is realized by inputting the second Data signal to the second Data signal terminal Data2, so that the Ids is adjusted by M × N Data voltages, and the effect of M × N gray scales is further realized. Compared with the adjustment of the existing single data signal terminal, the adjustment mode is more diversified, and the complexity of the data driving chip can be reduced while the gray scale depth is considered. In the implementation, there are some cases where Ids is a repetition, which is not necessarily exactly the relationship of M × N, where M is the number of copies of the first data signal and N is the number of copies of the second data signal.
In the embodiment of the invention, the first Scan signal terminal Scan1 and the second Scan signal terminal Scan2 are coupled to the same gate driving circuit, and the first Data signal terminal Data1 and the second Data signal terminal Data2 are respectively coupled to different Data lines. As shown in fig. 4, one of the structures of the pixel circuit is specifically illustrated, and the first constant voltage terminal V1, the second constant voltage terminal V2 and the second power source terminal VSS are all grounded, the second terminal of the first capacitor C1 is coupled to the first gate of the driving transistor DTFT, and the second terminal of the second capacitor C2 is coupled to the second gate of the driving transistor DTFT. As shown in fig. 5, which is a schematic diagram of one of the driving timings corresponding to the transistors in fig. 4 which are N-type transistors, specifically, when the first Data signal terminal Data1 is coupled to the Data line Data1(N), the second Data signal terminal Data2 is coupled to the Data line Data2(N), when Scan (N +1) is high, the first switching transistor T1 and the second switching transistor T2 are turned on, the first Data signal inputted to the Data line Data1(N) by the Data IC is stored in the first capacitor C1 through the first Data signal terminal Data1, the voltage corresponding to the first Data signal is inputted to the first gate of the driving transistor DTFT through the first capacitor C1, the second Data signal inputted to the Data line Data2(N) by the Data signal terminal Data2 is stored in the second capacitor C2, the voltage corresponding to the second Data signal is inputted to the second gate of the driving transistor DTFT through the second capacitor C2, and the driving voltage of the driving transistor is controlled by the first gate charging degree and the second gate, and further, the control of the light emitting current Ids of the light emitting device L is realized, so that the adjustment of the light emitting brightness of the light emitting device L is realized. In addition, in the specific implementation process, for each pixel on the same data line, charging is sequentially performed according to the line scanning frequency, and then the adjustment of the light emitting brightness of each pixel is realized.
In the embodiment of the invention, the first Data signal terminal Data1 and the second Data signal terminal Data2 are coupled to the same Data line, and the first Scan signal terminal Scan1 and the second Scan signal terminal Scan2 are respectively coupled to different stages of gate driving circuits. As shown in fig. 6, one of the structures of the pixel circuit is specifically illustrated, and the first constant voltage terminal V1, the second constant voltage terminal V2 and the second power source terminal VSS are all grounded, the second terminal of the first capacitor C1 is coupled to the first gate of the driving transistor DTFT, and the second terminal of the second capacitor C2 is coupled to the second gate of the driving transistor DTFT. As shown in fig. 7, which is a schematic diagram of one of the driving timings corresponding to the transistors in fig. 6, specifically, the first Data signal terminal Data1 and the second Data signal terminal Data2 are both coupled to the same Data line, when Scan (N) is high, the first switching transistor T1 is turned on, a first Data signal input from the Data IC to the Data line Data1(N) is stored to the first capacitor C1 through the first Data signal terminal Data1, a voltage corresponding to the first Data signal is input to the first gate of the driving transistor DTFT through the first capacitor C1, when Scan (N +1) is high, a second Data signal input from the Data IC to the Data line Data1(N) is stored to the second capacitor C2 through the second Data signal terminal Data2, a voltage corresponding to the second Data signal is input to the second gate of the driving transistor DTFT through the second capacitor C2, and the degree of charging control of the driving transistor DTFT is realized by the voltages input to the first Data signal terminal Data1 and the second gate of the driving transistor DTFT, and further, the control of the light emitting current Ids of the light emitting device L is realized, so that the adjustment of the light emitting brightness of the light emitting device L is realized. In addition, in the specific implementation process, for each pixel on the same data line, charging is sequentially performed according to the line scanning frequency, and then the adjustment of the light emitting brightness of each pixel is realized.
In the embodiment of the present invention, the pixel circuit further includes a first compensation circuit 10 coupled to the first Data signal terminal Data1, and the first compensation circuit 10 is used for performing threshold compensation on the first Data signal loaded to the first Data signal terminal Data 1. In a specific implementation, the first compensation circuit 10 may be provided in the Data IC, specifically, when the pixel circuit performs display, a compensation voltage for performing threshold compensation on the first Data signal is read from the first compensation circuit 10 in the Data IC, then, the first Data signal loaded to the first Data signal terminal Data1 is subjected to threshold compensation, and then, the light emission luminance of the light emitting device L is adjusted by the threshold-compensated first Data signal and the second Data signal loaded to the second Data signal terminal Data 2. In addition, the first compensation circuit 10 can also be a switching transistor, and when the switching transistor is in a conducting state, the threshold compensation is performed on the first Data signal loaded to the first Data signal terminal Data1, as shown in fig. 8, one of the structural diagrams of the pixel circuit including the first compensation circuit 10 is shown.
In the embodiment of the present invention, as shown in fig. 9, one of the structural diagrams of the pixel circuit including the second compensation circuit 20 is shown, specifically, the pixel circuit further includes the second compensation circuit 20 coupled to the second Data signal terminal Data2, and the second compensation circuit 20 is configured to perform threshold compensation on the second Data signal loaded to the second Data signal terminal Data 2. In a specific implementation, the second compensation circuit 20 may be provided in the Data IC, specifically, when the pixel circuit performs display, a compensation voltage for performing threshold compensation on the second Data signal is read from the second compensation circuit 20 in the Data IC, then, the second Data signal loaded to the second Data signal terminal Data2 is subjected to threshold compensation, and then, the light emission luminance of the light emitting device L is adjusted by the threshold-compensated second Data signal and the first Data signal loaded to the first Data signal terminal Data 1. In addition, the second compensation circuit 20 may also be a switching transistor, which performs threshold compensation on the second Data signal loaded to the second Data signal terminal Data2 when the switching transistor is in a conducting state.
In a specific implementation process, the first compensation circuit 10 and the second compensation circuit 20 may be specifically memory chips, and are configured to store a threshold compensation voltage for threshold compensation of the first data signal, and also be configured to store a threshold compensation voltage for threshold compensation of the second data signal. In a specific implementation, threshold compensation for the first Data signal and the second Data signal may be implemented by reading corresponding threshold compensation voltages from the memory chip through the Data IC.
In the embodiment of the present invention, as shown in fig. 10, specifically, the pixel circuit further includes a first compensation circuit 10 coupled to the first Data signal terminal Data1, the first compensation circuit 10 is used for performing threshold compensation on the first Data signal loaded to the first Data signal terminal Data1, and the pixel circuit further includes a second compensation circuit 20 coupled to the second Data signal terminal Data2, and the second compensation circuit 20 is used for performing threshold compensation on the second Data signal loaded to the second Data signal terminal Data 2. In a specific implementation, the first compensation circuit 10 and the second compensation circuit 20 may be provided in the Data IC, and specifically, when the pixel circuit performs display, the compensation voltage for performing threshold compensation on the first Data signal is read from the first compensation circuit 10 in the Data IC, and the compensation voltage for performing threshold compensation on the second Data signal is read from the second compensation circuit 20 in the Data IC, and then, the first Data signal loaded to the first Data signal terminal Data1 is subjected to threshold compensation, and the second Data signal loaded to the second Data signal terminal Data2 is subjected to threshold compensation, and then, the light emission luminance of the light emitting device L is adjusted by the first Data signal after threshold compensation and the second Data signal after threshold compensation 2. In addition, each of the first compensation circuit 10 and the second compensation circuit 20 may be a switching transistor, and when the switching transistor is in a turned-on state, the threshold compensation is performed on the first Data signal loaded to the first Data signal terminal Data1, and the threshold compensation is performed on the second Data signal loaded to the second Data signal terminal Data 2.
In the implementation process, the threshold voltage Vth of the driving transistor DTFT is easily shifted due to the process and the long-term use, and thus the operating current of the light emitting device L is affected, thereby causing display non-uniformity, and the display uniformity is ensured by applying the first Data signal after threshold compensation to the first Data signal terminal Data1 and/or applying the second Data signal after threshold compensation to the second Data signal terminal Data 2.
In the embodiment of the present invention, before modulating the gray scale voltage applied to the light emitting device L, the threshold compensation gray scale of each pixel determined by the external compensation technique may be used, and then the determined threshold compensation gray scale of each pixel is stored in the Data IC. In a specific implementation process, when the display panel displays the same pure white picture, the top gates corresponding to different sub-pixels are controlled to write the same voltage, the bottom gates are controlled to be 0V, and the compensation voltages of the bottom gates of different pixels are determined according to the IVL characteristics. By means of the adjustable characteristic of the double-gate driving transistor DTFT, compensation voltage can be written into the bottom gate to compensate threshold voltage, and therefore uniformity of display is guaranteed.
In a specific implementation, in addition to using the external compensation circuit shown in fig. 8 to 10 to implement threshold voltage compensation for the dual-gate driving circuit in 2T1C, the driving transistor in the conventional pixel circuit 7T1C may be a dual-gate transistor, specifically, the pixel circuit shown in fig. 11 may be used, accordingly, the top view of the display panel may be as shown in fig. 12, and in a specific implementation, the driving timing diagram shown in fig. 13 may be used, specifically, M4 is the driving transistor, M1, M2, M3, M5, M6, M7, and M8 are switching transistors, and the driving timing diagram shown in fig. 13 is the timing diagram corresponding to the driving transistor DTFT being a P-type thin film transistor. In the specific implementation process, in the period of T1, a Rest low level signal arrives, M1 and M7 are turned on, a Vint signal is written into the N1 node, and the N1 node is reset; in a stage T2, a Gate low level signal arrives, M2, M3 and M8 are turned on, a first data signal and a threshold compensation voltage for performing threshold compensation on the first data signal are written into an N1 node, the threshold compensation on the first data signal is completed, and a second data signal is written into an N2 node; at stage T3: when the EM low level signal comes, M5 and M6 are turned on, and the light emitting device L emits light under the control of the first data signal and the second data signal, thereby implementing gray scale display. In the implementation process, the pixel circuit shown in fig. 11 is adopted, so that the compensation of the threshold voltage of the driving transistor can be realized by using the internal compensation of the 8T2C pixel circuit shown in fig. 11 while realizing multi-gray scale modulation, and since the process of gray scale modulation is specifically the same as the process of 2T1C in fig. 3, the detailed description is omitted here. In addition, the driving transistor in other prior art pixel circuits can still adopt a double-gate transistor, which is not described herein again.
Based on the same inventive concept, as shown in fig. 14, an embodiment of the present invention further provides a display device, including: a plurality of sub-pixels; wherein each of the sub-pixels comprises a pixel circuit 100 as described above.
The principle of the display device to solve the problem is similar to the pixel circuit 100, so the implementation of the display device can be referred to the implementation of the pixel circuit 100, and repeated descriptions are omitted.
In a specific implementation process, the display device provided in the embodiment of the present invention may be a mobile phone as shown in fig. 14, and of course, the display device provided in the embodiment of the present invention may also be any product or component with a display function, such as a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention.
Based on the same inventive concept, fig. 15 is a flowchart illustrating a method of driving a pixel circuit according to an embodiment of the present invention, specifically, the method includes:
s101: acquiring an image to be displayed;
s102: determining the gray scale of the image to be displayed at each sub-pixel point position;
s103: determining the first data signal input to the first data signal end of the corresponding sub-pixel position and the second data signal input to the second data signal end according to the corresponding relation between the gray scale and the first data signal and the second data signal;
s104: and displaying the image to be displayed under the control of the first data signal and the second data signal.
In the specific implementation process, the specific implementation process of step S101 to step S104 is as follows:
first, an image to be displayed is obtained, where the image to be displayed may be any image stored in the display device, or may also be an image sent to the display device by other electronic equipment, and is not limited herein. Then, the gray scale of the image to be displayed at each sub-pixel point position is determined, for example, the display device includes 777600 sub-pixel points, and the gray scale of the image to be displayed at the 777600 sub-pixel point positions is correspondingly determined. When the image to be displayed is known, the corresponding gray scale depth is also known, and correspondingly, the gray scale of each sub-pixel point is known. For example, the gray scale of the image a to be displayed at the sub-pixel point a is 100. Then, according to the corresponding relationship between the gray scale and the first data signal and the second data signal, the first data signal input to the first data signal terminal corresponding to the sub-pixel position and the second data signal input to the second data signal terminal are determined, for example, the first data signal is 3V, and the second data signal is 0.5V. And then, under the control of the first data signal and the second data signal, displaying the image to be displayed. For example, when the first data signal is 3V and the second data signal is 0.5V, the image to be displayed is displayed.
In the embodiment of the present invention, before the driving method shown in fig. 12 is used to control the display device to display an image to be displayed, the related parameters of the pixel circuit shown in fig. 3 are debugged, so as to determine the corresponding relationship between the gray scale and the first data signal and the second data signal. Specifically, the relationship between the gray scale and the brightness under the gamma value of 2.2 is simulated according to the gray scale depth and the brightness range of the display device, for example, the gray scale depth is 2bit (8bit), the gray scale range is 0-255, and the brightness range is 0 nit-400 nit. Then, the brightness corresponding to each gray scale when the display device displays a test image is determined, then the current corresponding to the brightness of each gray scale is determined according to the IVL characteristic of the display device, then the first data signal and the second data signal under the current are determined according to the IV characteristic of the driving transistor DTFT, then the first data signal is input to the first data signal terminal, the second data signal is input to the second data signal terminal, the Ids of the light-emitting device L at the moment is determined, so that the gray scale of the light-emitting device L under the Ids is determined, so that the corresponding relation between the gray scale and the first data signal and the corresponding relation between the gray scale and the second data signal are determined, and similarly, the corresponding relation between each gray scale and the first data signal and the second data signal is established, and the corresponding relation between each gray scale and the first data signal and the second data signal can be stored in the debugging process, the subsequent display device can display the image to be displayed under the driving method shown in fig. 15.
In the specific implementation process, as shown in fig. 16, step S104: displaying the image to be displayed under the control of the first data signal and the second data signal, including:
s201: under the action of the first data signal and the second data signal, controlling the light-emitting device of the corresponding sub pixel point to emit light with the brightness larger than a preset threshold value;
s202: and displaying the image to be displayed while the light emitting device emits light with a brightness greater than the preset threshold.
In the specific implementation process, the specific implementation process from step S201 to step S202 is as follows:
firstly, under the action of the first data signal and the second data signal, the light emitting device L corresponding to the sub-pixel point is controlled to emit light with a brightness larger than a preset threshold value, for example, when the driving transistor DTFT is an N-type tube, a curve of a relationship between the driving voltage Vgs and the driving current Ids moves upward as a whole, and at this time, when the driving transistor DTFT is in a saturated state, the driving current Ids is correspondingly improved compared with that before being translated, so that the light emitting brightness of the light emitting device L is ensured, and the display effect of the display device is ensured. Especially, when the light emitting device L is an LED, a good display effect can be still ensured.
In the embodiment of the present invention, as shown in fig. 17, step S104: displaying the image to be displayed under the control of the first data signal and the second data signal, including:
s301: determining the brightness of the light emitting device corresponding to the sub-pixel under the control of the first data signal and the second data signal;
s302: displaying the image to be displayed while the light emitting device emits light at the luminance.
In the specific implementation process, the specific implementation process from step S301 to step S302 is as follows:
first, under the control of the first data signal and the second data signal, the luminance of the light emitting device L corresponding to the sub-pixel is determined, for example, the second data signal is 1V, the first data signal is 3V, the gray scale corresponding to the sub-pixel is 255, and the luminance of the light emitting device L corresponding to the sub-pixel is 500 nit. Then, the image to be displayed is displayed while the light emitting device L emits light at the luminance.
In the embodiment of the present invention, as shown in fig. 18, in step S103: after determining the first data signal input to the first data signal terminal of the corresponding sub-pixel position and the second data signal input to the second data signal terminal according to the corresponding relationship between the gray scale and the first data signal and the second data signal, the method further includes:
s401: acquiring a first threshold compensation voltage for performing threshold compensation on the first data signal and a second threshold compensation voltage for performing threshold compensation on the second data signal;
s402: the first threshold compensation voltage and the first data signal are input to the first data signal terminal, and the second threshold compensation voltage and the second data signal are input to the second data signal terminal.
In the specific implementation process, the specific implementation process from step S401 to step S402 is as follows:
first, after determining the first data signal input to a first data signal terminal corresponding to a sub-pixel position and the second data signal input to a second data signal terminal, a first threshold compensation voltage for performing threshold compensation on the first data signal and a second threshold compensation voltage for performing threshold compensation on the second data signal are obtained, for example, threshold compensation voltages for performing threshold compensation on the first data signal and the second data signal respectively may be obtained from a data driving chip, and then the first threshold compensation voltage and the first data signal are input to the first data signal terminal, and the second threshold compensation voltage and the second data signal are input to the second data signal terminal, so as to determine a gray scale of an image to be displayed. And then, displaying the image to be displayed under the gray scale. Specifically, a first data signal and a first threshold compensation voltage are input to a first data signal terminal, a second data signal and a second threshold compensation voltage are input to a second data signal terminal, and in a specific implementation process, a compensation voltage for aging of the driving transistor device can be determined, and a corresponding compensation voltage is input to the data signal terminal, so that the display quality of the display device is improved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A pixel circuit, comprising:
a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, a driving transistor, and a light emitting device;
the driving transistor is a double-gate transistor, a gate of the first switching transistor is coupled to a first scanning signal terminal, a first gate of the first switching transistor is coupled to a first data signal terminal, and a second gate of the first switching transistor is coupled to the first gate of the driving transistor;
a gate of the second switching transistor is coupled to a second scan signal terminal, a first pole of the second switching transistor is coupled to a second data signal terminal, and a second pole of the second switching transistor is coupled to a second gate of the driving transistor;
a first terminal of the first capacitor is coupled to the first gate of the driving transistor, and a second terminal of the first capacitor is coupled to a first constant voltage terminal or a first pole of the driving transistor;
a first end of the second capacitor is coupled with the second grid electrode of the driving transistor, and a second end of the second capacitor is coupled with a second constant voltage end or the first pole of the driving transistor;
the second pole of the driving transistor is coupled with a first power supply end, and the first pole of the driving transistor is coupled with the anode of the light-emitting device;
the cathode of the light emitting device is coupled to a second power supply terminal.
2. The pixel circuit according to claim 1, wherein the first scan signal terminal and the second scan signal terminal are coupled to a same gate driving circuit, and the first data signal terminal and the second data signal terminal are respectively coupled to different data lines.
3. The pixel circuit according to claim 1, wherein the first data signal terminal and the second data signal terminal are coupled to a same data line, and the first scan signal terminal and the second scan signal terminal are respectively coupled to different stages of gate driving circuits.
4. The pixel circuit of claim 1, further comprising a first compensation circuit coupled to the first data signal terminal, the first compensation circuit for threshold compensation of a first data signal applied to the first data signal terminal.
5. The pixel circuit according to claim 1 or 4, further comprising a second compensation circuit coupled to the second data signal terminal, the second compensation circuit for threshold compensation of a second data signal applied to the second data signal terminal.
6. A display device, comprising:
a plurality of sub-pixels; wherein each of the sub-pixels comprises a pixel circuit as claimed in any one of claims 1 to 5.
7. A method of driving a pixel circuit according to any one of claims 1 to 5, comprising:
acquiring an image to be displayed;
determining the gray scale of the image to be displayed at each sub-pixel point position;
determining the first data signal input to the first data signal end of the corresponding sub-pixel position and the second data signal input to the second data signal end according to the corresponding relation between the gray scale and the first data signal and the second data signal;
under control of the first data signal and the second data signal,
and displaying the image to be displayed.
8. The driving method according to claim 7, wherein the displaying the image to be displayed under the control of the first data signal and the second data signal comprises:
under the action of the first data signal and the second data signal, controlling the light-emitting device of the corresponding sub pixel point to emit light with the brightness larger than a preset threshold value;
and displaying the image to be displayed while the light emitting device emits light with a brightness greater than the preset threshold.
9. The driving method according to claim 7, wherein the displaying the image to be displayed under the control of the first data signal and the second data signal comprises:
determining the brightness of the light emitting device corresponding to the sub-pixel under the control of the first data signal and the second data signal;
displaying the image to be displayed while the light emitting device emits light at the luminance.
10. The driving method according to claim 7, wherein after determining the first data signal input to the first data signal terminal of the corresponding sub pixel position and the second data signal input to the second data signal terminal according to the correspondence between the gray scale and the first data signal and the second data signal, the method further comprises:
acquiring a first threshold compensation voltage for performing threshold compensation on the first data signal and a second threshold compensation voltage for performing threshold compensation on the second data signal;
the first threshold compensation voltage and the first data signal are input to the first data signal terminal, and the second threshold compensation voltage and the second data signal are input to the second data signal terminal.
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