CN108877643B - Pixel driving circuit, display device and driving method - Google Patents
Pixel driving circuit, display device and driving method Download PDFInfo
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- CN108877643B CN108877643B CN201810775887.XA CN201810775887A CN108877643B CN 108877643 B CN108877643 B CN 108877643B CN 201810775887 A CN201810775887 A CN 201810775887A CN 108877643 B CN108877643 B CN 108877643B
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The embodiment of the invention provides a pixel driving circuit, a display device and a driving method, relates to the technical field of display, and can solve the problem that a pixel driving circuit in the prior art cannot meet the driving mode of high scanning frequency due to long capacitor charging time; the pixel driving circuit comprises a switch transistor, a static random access memory, a light emitting diode and a driving transistor connected with the light emitting diode; the grid electrode of the switch transistor is connected with the grid line, the source electrode of the switch transistor is connected with the data line, and the drain electrode of the switch transistor is connected with the input end of the static random access memory; the output end of the static random access memory is connected with the grid electrode of the driving transistor.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving circuit, a display device and a driving method.
Background
With the increasing demand for display devices, the self-luminous display devices have been widely used in various electronic devices, including computers and mobile phones, due to their advantages of self-luminous, light and thin, low power consumption, high contrast, high color gamut, and flexible display.
The self-Light Emitting units in the existing self-Light Emitting display devices are generally Organic Light Emitting Diodes (OLEDs)), Quantum Dot Light Emitting Diodes (QLEDs), Micro Light Emitting Diodes (Micro LEDs), and the like; in actual display, the display of a screen is generally realized by driving the light emitting unit to emit light by a pixel driving circuit.
However, the existing pixel driving circuit generally adopts a 3T1C structure (3 thin film transistors and 1 capacitor), and the storage of pixel data is realized by charging the capacitor in the pixel driving circuit; however, the charging of the capacitor requires a long time, so that when the driving method is applied to a fast scan frequency, the scanning speed is fast, and the conventional pixel driving circuit is limited by the charging time, so that the fast pixel data input cannot be satisfied, and the normal display cannot be performed.
Disclosure of Invention
Embodiments of the present invention provide a pixel driving circuit, a display device, and a driving method, which can solve the problem that a driving method with a high scanning frequency cannot be satisfied due to a long capacitor charging time in a pixel driving circuit in the prior art.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
an embodiment of the present invention provides a pixel driving circuit, including: the circuit comprises a switch transistor, a static random access memory, a light emitting diode and a driving transistor connected with the light emitting diode; the grid electrode of the switch transistor is connected with the grid line, the source electrode of the switch transistor is connected with the data line, and the drain electrode of the switch transistor is connected with the input end of the static random access memory; and the output end of the static random access memory is connected with the grid electrode of the driving transistor.
Optionally, the sram includes: a first inverter and a second inverter; the output end of the first phase inverter is connected with the input end of the second phase inverter, and the output end of the second phase inverter is connected with the input end of the first phase inverter; the input end of the first phase inverter is connected with the output end of the static random access memory, and the output end of the second phase inverter is connected with the input end of the static random access memory.
Optionally, the light emitting diode is a Micro LED.
Optionally, the driving transistor is an N-type transistor; the anode of the light emitting diode is connected with the first voltage end, and the cathode of the light emitting diode is connected with the source electrode of the driving transistor.
Optionally, the pixel driving circuit further includes a light emission control transistor; the grid electrode of the light-emitting control transistor is connected with a light-emitting scanning signal line, the source electrode of the light-emitting control transistor is connected with the drain electrode of the driving transistor, and the drain electrode of the light-emitting control transistor is connected with a second voltage end.
In another aspect, the present invention provides a display device, which includes a plurality of sub-pixels; the pixel driving circuit is arranged in each sub-pixel.
In another aspect of the embodiments of the present invention, there is provided a driving method of a display device as described above, where the driving method includes: in a period of an image frame, scanning signals are input to the grid lines to start the sub-pixels line by line; under the condition that one row of sub-pixels are turned on, corresponding pixel data in an image frame to be displayed are respectively input to different sub-pixels through data lines, so that the image frame to be displayed is displayed within a period of one image frame.
In another aspect of the embodiments of the present invention, there is provided a driving method of a display device as described above, where the driving method includes: in the ith sub-period in a period of an image frame, scanning signals are input to the grid lines to turn on the sub-pixels line by line; wherein the period of the one image frame comprises: n sub-periods are sequentially arranged, and each sub-period is divided into: a data writing period and a lighting period located after the data writing period; the duration of the lighting period in the ith sub-period is
I is more than or equal to 1 and less than or equal to N; n is more than or equal to 2 and less than or equal to 10; i. n is a positive integer; t is the total duration of N lighting time periods in a time period of one image frame; under the condition that one row of sub-pixels is turned on, pixel data corresponding to the ith image sub-frame in N image sub-frames forming an image frame to be displayed are respectively input to different sub-pixels through data lines, so that the image frame to be displayed is displayed within a period of one image frame.
Optionally, N ═ 4, 6, or 8.
Optionally, the display frequency of the image frames is 60 Hz.
The embodiment of the invention provides a pixel driving circuit, a display device and a driving method, wherein the pixel driving circuit comprises a switching transistor, a static random access memory, a light emitting diode and a driving transistor connected with the light emitting diode; the grid electrode of the switch transistor is connected with the grid line, the source electrode of the switch transistor is connected with the data line, and the drain electrode of the switch transistor is connected with the input end of the static random access memory; the output end of the static random access memory is connected with the grid electrode of the driving transistor.
Compared with the pixel driving circuit in the prior art, the pixel driving circuit adopts the capacitor to store the pixel data, needs longer charging time and cannot meet the driving mode of high scanning frequency, the static random access memory is adopted to store the pixel data, the static random access memory has the characteristic of quick storage, can quickly store the pixel data, and the static random access memory can constantly maintain the stored data as long as the static random access memory is electrified, so that the pixel driving circuit in the invention solves the problem that the driving mode of high scanning frequency cannot be met in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an inverter according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a driving method of a display device according to an embodiment of the invention;
fig. 5 is a schematic diagram illustrating a driving method of a display device according to an embodiment of the invention;
fig. 6 is a flowchart illustrating a driving method of a display device according to an embodiment of the present invention.
Reference numerals:
ms — a switching transistor; md-drive transistor; 100-static random access memory; 101-a first inverter; 102-a second inverter; 200-a light emitting diode; a Gata-gate line; Data-Data lines; EMs-emission control transistor; an EM-emission scanning signal line; vdd — first voltage terminal; vss-second voltage terminal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar language in the embodiments of the present invention does not denote any order, quantity, or importance, but rather the terms "first," "second," and similar language are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
An embodiment of the present invention provides a pixel driving circuit, as shown in fig. 1, the pixel driving circuit includes: a switch transistor Ms, a Static Random-Access Memory 100 (SRAM), a light emitting diode 200, and a driving transistor Md connected to the light emitting diode 200.
The gate of the switching transistor Ms is connected to the gate line Gata, the source is connected to the Data line Data, and the drain is connected to the input terminal IN of the SRAM; the output terminal OUT of the SRAM is connected to the gate of the drive transistor Md.
Of course, the pixel driving circuit may further include other transistors, and correspondingly connect other voltage terminals or signal lines, etc., which is not limited in the present invention, and in practice, a specific circuit configuration may be selected according to needs.
Compared with the pixel driving circuit in the prior art, the pixel driving circuit in the invention adopts the capacitor to store the pixel data, and the driving mode of high scanning frequency cannot be met due to the long charging time, the SRAM is adopted to store the pixel data in the invention, the SRAM has the characteristic of quick storage, the pixel data can be quickly stored, and the SRAM can constantly maintain the stored data as long as the SRAM is ensured under the condition of electrifying, so that the pixel driving circuit in the invention solves the problem that the driving mode of high scanning frequency cannot be met in the prior art.
It should be understood that the pixel driving circuit of the present invention adopts the fast storage characteristic of the SRAM to solve the problem that the prior art cannot satisfy the driving manner with high scanning frequency, so the pixel driving circuit of the present invention can be applied to any self-luminous display device that needs to adopt the pixel driving circuit to control the light emitting unit; that is, the light emitting diode 200 in the pixel driving circuit may be an OLED, a QLED, or a Micro LED (also referred to as a uuled).
In addition, especially for Micro LEDs, since the light emitting efficiency of the Micro LEDs is very low at low current, the problem of low light emitting efficiency of the entire display device is caused by adopting a pixel driving circuit (for storing pixel data by a capacitor) in the prior art and an analog driving (for example, PAM driving) manner, so that the Micro LED display device is more prone to adopt a digital driving manner in practice, but the existing pixel driving circuit cannot meet the requirement of the Micro LED display device for high scanning frequency of digital driving.
Specifically, the present invention will be further described below with reference to analog driving and digital driving.
First, it should be understood that the analog driving generally employs Pulse Amplitude Modulation (PAM), which is to keep the pulse duty ratio of the driving signal constant for a certain period of time (usually, an image frame period), and different pulse amplitudes are used to represent different image gray scale levels.
In contrast, the digital driving employs Sub-Frame driving (SFD) to divide an image Frame into a plurality of Sub-frames (corresponding to the scanning frequency is multiplied), the lighting time of each Sub-Frame depends on the image data bit weight represented by the Sub-Frame and whether the bit is 0 or 1, and the sum of the lighting time of all Sub-frames determines the image gray scale; it should be understood that the illumination of all sub-frames is a fixed current or voltage output.
Based on this, for the Micro LED display device, the pixel driving circuit is adopted to carry out digital driving, and because the lightening of all sub-frames is fixed current or voltage output, the problem of low luminous efficiency of the Micro LED under low current is avoided, and the requirement on high scanning frequency is met; that is, the pixel driving circuit in the invention is more suitable for driving the micro LED display device.
In the following embodiments, the light emitting diode in the pixel driving circuit is taken as a micro led for example, and the invention is further described.
Specifically, as shown in fig. 2, the SRAM may include: a first inverter 101 and a second inverter 102.
The output end of the first inverter 101 is connected to the input end of the second inverter 102, the output end of the second inverter 102 is connected to the input end of the first inverter 101 (for the input end and the output end of the inverters, refer to fig. 3 specifically), the input end of the first inverter 101 is connected to the output end OUT of the SRAM, and the output end of the second inverter 102 is connected to the input end IN of the SRAM, that is, the SRAM adopts a cross connection mode of the input and output of two inverters, so that the input pixel data can still keep the original state after being converted by the two inverters and stored; illustratively, the SRAM can still maintain the "1" state after the "1" state in the pixel data is converted by two inverters, and achieve the storage of 1 bit (or 1 bit).
On this basis, in order to ensure that the driving transistor Md has a stable gate-source voltage, thereby ensuring that the light emitting diode 200 stably emits light, it is preferable in the present invention that, as shown in fig. 2, the driving transistor Md is an N-type transistor; the anode of the light emitting diode 200 is connected to the first voltage terminal Vdd, and the cathode is connected to the source of the driving transistor Md.
Of course, the driving transistor Md may also be a P-type transistor, in which case the led 200 is connected to one side of the source terminal of the P-type transistor; in practice, the driving transistor Md usually adopts an N-type transistor, the anode is connected to the first voltage terminal Vdd, and the cathode is connected to the source of the driving transistor Md; the following examples are given as examples to further illustrate the present invention.
Further, in a preferred embodiment of the present invention, as shown in fig. 2, the pixel driving circuit further includes a light emission control transistor EMs; the gate of the emission control transistor EMs is connected to the emission scanning signal line EM, the source of the emission control transistor EMs is connected to the drain of the driving transistor Md, and the emission control transistor EMs is connected to the second voltage terminal Vss.
Therefore, the on-off of the light-emitting control transistor EMs is controlled through the light-emitting scanning signal line EM, so that the light-emitting duration of the light-emitting diode can be controlled, the mistaken lighting of the light-emitting diode is avoided, and the stable light-emitting of the light-emitting diode is ensured.
The embodiment of the invention also provides a display device, which comprises a plurality of sub-pixels; the pixel driving circuit provided in each sub-pixel has the same structure and beneficial effects as the pixel driving circuit provided in the previous embodiment. Since the foregoing embodiments have described the structure and advantageous effects of the pixel driving circuit in detail, the details are not repeated here.
It should be noted that the display device may specifically include at least an OLED display panel, a QLED display panel, and a MicroLED display panel; for example, the display panel can be applied to any product or component with a display function, such as a display, a television, a digital photo frame, a mobile phone or a tablet computer.
Embodiments of the present invention further provide a driving method for the display device, and it can be understood that the driving method (analog driving) can be applied to any of the display devices.
Specifically, in conjunction with the pixel circuit of fig. 2, as shown in fig. 4, the driving method includes:
in step S101, in a period of one image frame, the scan signal is input to the gate line Gata to turn on the sub-pixels row by row.
Step S102, respectively inputting corresponding pixel Data in the image frame to be displayed to different sub-pixels through the Data line Data under the condition that a row of sub-pixels is turned on, so as to display the image frame to be displayed in a period of one image frame.
The pixel driving circuit adopts the SRAM to store the pixel data, the SRAM has the characteristic of quick storage, the pixel data can be quickly stored, the SRAM can constantly maintain the stored data as long as the SRAM is electrified, namely the SRAM is used as a static Latch (Latch) circuit, and therefore the problem that the driving mode with high scanning frequency cannot be met in the prior art is solved.
The embodiment of the present invention further provides another driving method for the foregoing display device, and the driving method (digital driving) is particularly suitable for Micro LED display devices (refer to the foregoing embodiment specifically).
Specifically, with respect to this driving method, referring to fig. 5, it can be understood that the period (1Frame) for one image Frame includes: n Sub-periods (SF) are sequentially set, and each Sub-period (SF) is divided into: a data write period TU and a lighting period TL following the data write period TU.
Wherein, in N sub-periods SF of a period (1Frame) of one image Frame, a duration of a lighting period TLi in an ith sub-period SFi is set to be
I is more than or equal to 1 and less than or equal to N; n is more than or equal to 2 and less than or equal to 10; i. n is a positive integer; t is the total duration of the N lighting periods TL in a period of one image frame, that is, the duration of the N data writing periods TU subtracted from the period of one image frame.
In this case, the image frame to be displayed is divided into N image sub-frames, and there is a one-to-one correspondence (i.e., correspondence of pixel data) between the N image sub-frames and the N sub-periods, for example, the ith image sub-frame of the N image sub-frames necessarily corresponds to the ith sub-period; in actual display, although there are N different image sub-frames, for the human eye (which is indistinguishable for images with a display frequency exceeding 45 Hz), it is seen that: and displaying the display effect of one image frame after the N different image sub-frames are superposed.
In an example, the digital driving is specifically described with reference to fig. 5, taking N-4 as an example.
As shown in fig. 5, the period (1Frame) of one image Frame includes 4 sub-periods (SF1, SF2, SF3, SF4), and the durations of the lighting periods (TL1, TL2, TL3, TL4) of the 4 sub-periods (SF1, SF2, SF3, SF4) are respectively TL1, TL2, TL3, TL4)
That is, the time length ratio of the lighting period of the 4 sub-periods (SF1, SF2, SF3, SF4) is: 1:2:4:8.
Furthermore, the image Frame to be displayed (i.e. the initial image in fig. 5) is divided into 4 image sub-frames corresponding to 4 sub-periods (SF1, SF2, SF3, SF4), so that 4 different image sub-frames are displayed in a superimposed manner within a period (1Frame) of one image Frame, and then the human eye sees the display effect of one image Frame (initial image).
It should be noted that, firstly, the time period (1Frame) of the above-mentioned one image Frame is generally preferably set to 16ms (i.e., 1/60s, corresponding to a display frequency of 60 Hz), but the present invention is not limited thereto, and the setting may be selected as required in practice; for example, a period corresponding to a display frequency of 120Hz may be employed.
Second, the value of N is preferably 4, 6 or 8 in general, but is not limited thereto. For example, when N is 4, the display device can display an image of 16 gradations (i.e., (4096 colors ((2))4)3) (ii) a When N is 6, the display device can display an image of 64 gradations (i.e., 26 ten thousand colors ((2)6)3) (ii) a When N is 8, the display device can display an image of 256 gradations (i.e., 16.7 mega color ((2))8)3)。
Thirdly, the arrangement order of the plurality of different sub-periods SF within the period (1Frame) of one image Frame is not particularly limited in the present invention; for example, the image data may be sequentially sorted according to SF1, SF2, SF3, and SF4 as shown in fig. 5, or may be sequentially sorted according to SF2, SF3, SF4, and SF1, but the present invention is not limited thereto as long as a plurality of different sub-periods are sequentially driven within a period (1Frame) of one image Frame.
Based on this, as shown in fig. 6, the driving method includes:
in step S201, in the ith sub-period SFi in the period (1Frame) of one image Frame, the scan signal is input to the gate line Gata to turn on the sub-pixels row by row.
Step S202, when a row of sub-pixels is turned on, respectively inputting pixel Data corresponding to the ith image sub-Frame of N image sub-frames constituting an image Frame to be displayed to different sub-pixels through the Data line Data, so as to display the image Frame to be displayed in a period (1Frame) of one image Frame.
Hereinafter, the gray scale display of the present invention will be further described with reference to fig. 5 when N is 4.
First, it is understood that the display device can display an image of 16 gradations (i.e., 4096 colors) when N is 4.
Also, under this driving method, although the current lighted in each sub-period is a fixed current (i.e., the light emitting diode has a fixed actual brightness), the actual gray scale depends on the lighting time duration, that is, the gray scale is expressed according to the lighting time duration, that is, the gray scale is controlled by controlling whether each sub-period SF is lighted or not in the period (1Frame) of one image Frame.
Specifically, referring to fig. 5, the duration of the lighting period (TL1, TL2, TL3, TL4) of the 4 sub-periods (SF1, SF2, SF3, SF4)
Different; taking the pixel data of one pixel point as an example, the pixel data is assumed to be 4-bit data, and may be, for example, 4-bit data1001 (i.e. 1001 for the pixel data inputted by the data line), in this case, the sub-period SF1 is in the lighting state corresponding to "1", SF4 is in the lighting state corresponding to "1", and sub-period SF2 and sub-period SF3 are in the non-lighting state corresponding to "0", and the total lighting time is
I.e. a luminance which appears as a grey Level 9(Level 9).
Of course, as for the pixel driving circuit itself (refer to fig. 2), it can be understood that, for each sub-period (SF1, SF2, SF3, SF4), it is inevitable that the switching transistor Ms is turned on when the gate line Gata inputs the scan signal.
However, when data for a certain sub period (for example, the aforementioned SF2, SF3) in the pixel data is "0", the drive transistor Md is in an off state; when the data of a sub-period (for example, the aforementioned SF1, SF4) is "1", the driving transistor Md is turned on and is controlled by the emission control transistor EMs, so that the normal emission at this stage is realized, and the display of the target gray scale is realized.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A pixel driving circuit, comprising: the circuit comprises a switch transistor, a static random access memory, a light emitting diode and a driving transistor connected with the light emitting diode;
the grid electrode of the switch transistor is connected with the grid line, the source electrode of the switch transistor is connected with the data line, and the drain electrode of the switch transistor is connected with the input end of the static random access memory; the output end of the static random access memory is connected with the grid electrode of the driving transistor;
the static random access memory includes: a first inverter and a second inverter;
the output end of the first phase inverter is connected with the input end of the second phase inverter, and the output end of the second phase inverter is connected with the input end of the first phase inverter;
the input end of the first phase inverter is connected with the output end of the static random access memory, and the output end of the second phase inverter is connected with the input end of the static random access memory.
2. The pixel driving circuit according to claim 1, wherein the light emitting diode is a Micro LED.
3. The pixel driving circuit according to claim 1 or 2, wherein the driving transistor is an N-type transistor;
the anode of the light emitting diode is connected with the first voltage end, and the cathode of the light emitting diode is connected with the source electrode of the driving transistor.
4. The pixel driving circuit according to claim 3, further comprising a light emission control transistor;
the grid electrode of the light-emitting control transistor is connected with a light-emitting scanning signal line, the source electrode of the light-emitting control transistor is connected with the drain electrode of the driving transistor, and the drain electrode of the light-emitting control transistor is connected with a second voltage end.
5. A display device, characterized in that the display device comprises a plurality of sub-pixels; a pixel driving circuit as claimed in any one of claims 1 to 4 provided in each of the sub-pixels.
6. A driving method of a display device according to claim 5, wherein the driving method comprises:
in a period of an image frame, scanning signals are input to the grid lines to start the sub-pixels line by line;
under the condition that one row of sub-pixels are turned on, corresponding pixel data in an image frame to be displayed are respectively input to different sub-pixels through data lines, so that the image frame to be displayed is displayed within a period of one image frame.
7. A driving method of a display device according to claim 5, wherein the driving method comprises:
in the ith sub-period in a period of an image frame, scanning signals are input to the grid lines to turn on the sub-pixels line by line; wherein the period of the one image frame comprises: n sub-periods are sequentially arranged, and each sub-period is divided into: a data writing period and a lighting period located after the data writing period; the duration of the lighting period in the ith sub-period is
I is more than or equal to 1 and less than or equal to N; n is more than or equal to 2 and less than or equal to 10; i. n is a positive integer; t is the total duration of N lighting time periods in a time period of one image frame;
under the condition that one row of sub-pixels is turned on, pixel data corresponding to the ith image sub-frame in N image sub-frames forming an image frame to be displayed are respectively input to different sub-pixels through data lines, so that the image frame to be displayed is displayed within a period of one image frame.
8. The method for driving a display device according to claim 7,
n-4, 6 or 8.
9. The method for driving a display device according to claim 7 or 8, wherein a display frequency of the image frame is 60 Hz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810775887.XA CN108877643B (en) | 2018-07-13 | 2018-07-13 | Pixel driving circuit, display device and driving method |
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