CN111415623A - Pixel driving circuit, driving method thereof, display panel and display device - Google Patents
Pixel driving circuit, driving method thereof, display panel and display device Download PDFInfo
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- CN111415623A CN111415623A CN202010247013.4A CN202010247013A CN111415623A CN 111415623 A CN111415623 A CN 111415623A CN 202010247013 A CN202010247013 A CN 202010247013A CN 111415623 A CN111415623 A CN 111415623A
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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]
- G09G3/3266—Details of drivers for scan electrodes
Abstract
The invention provides a pixel driving circuit and a driving method thereof, a display panel and display equipment, wherein the pixel driving circuit comprises a plurality of rows and a plurality of columns of pixel units, in each column of pixel units, when a first clock in a current row of pixel units is at a high potential and a second clock is at a low potential, a first capacitor is controlled to charge according to a high potential signal output by an output end of the previous row of pixel units, when the first clock is at a low potential and the second clock is at a high potential, the first capacitor outputs a stored high potential signal to the output end to control a light-emitting layer to emit light according to the stored high potential signal, and reset is carried out according to a high potential signal output by an output end of a next row of pixel units, the output end of the current row of pixel units is at a low potential to realize the line-by-line driving of the same row of pixel units.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving circuit, a driving method thereof, a display panel and display equipment.
Background
The Array substrate line driving (GOA) technology is a driving method for manufacturing a gate line scanning driving signal circuit on an Array substrate by using a conventional liquid crystal display panel Array (Array) process to scan a gate line by line, and is widely applied to the design of an organic light emitting diode (O L ED) display panel because the Array substrate line driving technology can save a gate driving chip (gate IC) and reduce the width of a frame to a certain extent.
However, because the GOA circuits are disposed on two sides of the O L ED display panel, the frame of the O L ED display panel must be set with a certain width, which directly restricts the current O L ED display panel from being able to achieve a narrower frame or even a frameless design, and thus cannot meet the current demand for a narrower frame or even a frameless frame of the O L ED product.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the present invention provides a pixel driving circuit to turn on and charge the pixels in the entire row without the GOA circuit, so as to achieve the borderless of the O L ED display panel.
The invention also provides a driving method of the pixel driving circuit.
The invention also provides an organic light emitting diode display panel.
The invention also provides a display device.
In one aspect, an embodiment of the present invention provides a pixel driving circuit, where the pixel driving circuit includes a plurality of rows and columns of pixel units, each pixel unit includes a transfer unit and a driving unit, the transfer unit includes an input end, a first capacitor, a first clock, and a second clock, and the driving unit includes an output end and a light emitting layer, where in each column of pixel units, when the first clock in a current row of pixel units is at a high potential and the second clock is at a low potential, the first capacitor is controlled to be charged according to a high potential signal output by the output end of a previous row of pixel units; when the first clock is at a low potential and the second clock is at a high potential, the first capacitor outputs the stored high potential signal to the output end so as to control the luminescent layer to emit light according to the stored high potential signal; and resetting according to the high potential signal output by the output end of the pixel unit in the next row, and setting the output end of the pixel unit in the current row to be a low potential so as to realize the row-by-row driving of the pixel units in the same column.
According to the pixel driving circuit provided by the embodiment of the invention, the output of the pixel units in the upper row is used as the input to charge the capacitor, the output of the pixel units in the lower row is used as the reset signal, the output end of the pixel unit in the current row is pulled down to be the low potential, and the row-by-row charging among the pixels in the same column is realized, so that the pixels in the whole row can be charged by opening without a GOA circuit, and the borderless of an O L ED display panel is further realized.
In another aspect, an embodiment of the present invention provides a driving method of a pixel driving circuit as in the above embodiments, the method is used to implement row-by-row driving of pixel units in the same column, and in each column of pixel units, the method includes:
when a first clock is set to be a high potential and a second clock is set to be a low potential, setting an input end to be the high potential according to a high potential signal output by an output end of a pixel unit in the previous row, opening a first charging switch and a fourth resetting switch, and closing other switches so as to charge a first capacitor and a second capacitor, wherein the first capacitor stores a high potential signal, and the second capacitor stores a low potential signal;
when the first clock is set to be a low potential and the second clock is set to be a high potential, the second charging switch is turned on, other switches are turned off, a high potential signal stored by the first capacitor is output to an output end, the second driving switch is turned on according to the high potential signal stored by the first capacitor to control the light-emitting layer to emit light, and meanwhile, the high level signal received by the output end is output to the reset end of the pixel unit in the upper row and the input end of the pixel unit in the next row;
and receiving a high potential signal output by the output end of the next row of pixel units, setting the reset end to be a high potential, and opening the first reset switch, the second reset switch and the fourth reset switch to set the output end to be a low potential, wherein at the moment, the first capacitor stores a low potential signal, and the second capacitor stores a high potential signal.
According to the driving method of the pixel driving circuit, the output of the pixel units in the upper row is used as the input to charge the capacitor, the output of the pixel units in the lower row is used as the reset signal, the output end of the pixel unit in the current row is pulled down to be the low potential, and the row-by-row charging among the pixels in the same column is achieved, so that the pixels in the whole row can be charged by opening without a GOA circuit, and the frameless structure of the O L ED display panel is achieved.
In another embodiment of the present invention, an organic light emitting diode display panel is provided, which includes the pixel driving circuit described in the above embodiments.
An embodiment of another aspect of the present invention provides a display device, including: the organic light emitting diode display panel and the controller according to the above embodiments;
the controller is configured to control the active matrix organic light emitting diode display panel to display, and includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where when the processor executes the computer program, the controller implements the driving method of the pixel driving circuit according to the embodiment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
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 a transmission unit and a driving unit according to an embodiment of the present invention;
FIG. 3 is a timing diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 4 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A pixel drive circuit of an embodiment of the present invention is described below with reference to the drawings.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention.
As analyzed by the background art, in the related art, because the GOA circuits are disposed on two sides of the O L ED display panel, the frame of the O L ED display panel must be set with a certain width, which directly restricts the current O L ED display panel from being able to achieve a narrower frame or even a frameless design, and thus cannot meet the current demand of the O L ED product for narrower frame or even frameless.
To solve this problem, embodiments of the present invention provide a pixel driving circuit, which can turn on and charge pixels in an entire row without a GOA circuit, thereby implementing a borderless O L ED display panel.
As shown in fig. 1, the pixel driving circuit includes a plurality of rows and columns of pixel units, each pixel unit includes a transfer unit and a driving unit, the transfer unit includes an input terminal, a first capacitor, a first clock and a second clock, the driving unit includes an output terminal and a light emitting layer, wherein in each column of pixel units, when the first clock in the current row of pixel units is at a high potential and the second clock is at a low potential, the first capacitor is controlled to be charged according to a high potential signal output by the output terminal of the previous row of pixel units; when the first clock is at a low potential and the second clock is at a high potential, the first capacitor outputs the stored high potential signal to the output end so as to control the luminescent layer to emit light according to the stored high potential signal; and resetting according to the high potential signal output by the output end of the pixel unit in the next row, and setting the output end of the pixel unit in the current row to be a low potential so as to realize the row-by-row driving of the pixel units in the same column.
It can be understood that, in the embodiment of the present invention, when the first clock is at a high potential, the input of the pixel unit in the previous row is used as the input of the pixel unit in the current row to charge the first capacitor, and when the second clock is at a high potential, the input of the pixel unit in the previous row is output as the charge start signal of the pixel driving unit in the next row, the output of the pixel unit in the next row is used as the reset signal of the current row, the voltage at the output end of the current row is pulled down to realize the row-by-row charging between the pixels, and the transfer unit is built in the pixel driving circuit to realize the row-by-row charging between the pixels in the same column, so that the pixel in the whole row can be charged without the GOA.
In this embodiment, as shown in fig. 2, the transmission unit further includes: a first charging switch M6 and a second charging switch M5, first to fourth reset switches, and a second capacitor C2.
Specifically, a gate of the first charge switch M6 is connected to the first input terminal input1, a source of the first charge switch M6 is connected to the first clock C L K1, a drain of the first charge switch M6 is connected to one end of the first capacitor C1, a source of the second charge switch M5, and a source of the first reset switch M3, the other end of the first capacitor C1 is connected to a zero potential, a gate of the second charge switch M5 is connected to the second clock C L K2, a drain of the second charge switch M5 is connected to a source of the second reset switch M3 ', drains of the first reset switch M3 and the second reset switch M3' are both connected to a low potential, gates of the first reset switch M3 and the second reset switch M3 'are both connected to one end of the second capacitor, the other end of the second capacitor C2 is connected to a low potential, a gate of the third reset switch M4 is connected to a reset terminal, a gate of the third reset switch M8672 is connected to a source of the fourth reset switch M4, and a drain of the fourth reset switch M4' are both connected to a low potential.
In the present embodiment, as shown in fig. 2, the driving unit further includes a first driving switch M1, a second driving switch M2, and a third capacitor C.
Specifically, the method comprises the following steps: the drain of the first driving switch M1 is connected to a high potential, the source of the first driving switch M1 is connected to the anode of the light emitting layer, the cathode of the light emitting layer is connected to a low potential, the gate of the first driving switch M1 and the drain of the second driving switch M2 are both connected to one end of a third capacitor C, the other end of the third capacitor C is connected to a low potential, the source of the second driving switch M2 is connected to a data signal Date, and the gate of the second driving switch M2 is connected to the drain of the second charging switch M5 and the output terminal output, respectively.
The driving principle of the pixel driving circuit will be described with reference to fig. 3, taking one pixel unit in any column as an example, where the row where the pixel unit is located is referred to as the current row, which is as follows:
a charging period: the first clock is set to be high potential, the second clock is set to be low potential, the last row of pixel units outputs the pull-up current row input end to be high potential, the first charging switch M6 and the fourth reset switch M4' are opened, other switches are closed, at the moment, the first capacitor C1 and the second capacitor C2 are charged, wherein the first capacitor stores high potential signals, and the second capacitor stores low potential signals;
in the output period, the first clock is set to be at a low potential, the second clock is set to be at a high potential, at the moment, the input end is at the low potential, the second capacitor stores a low potential signal, the second charging switch M5 is turned on, other switches are turned off, a high potential signal stored in the first capacitor C1 is output to the output end output, the second driving switch M2 is turned on through the high potential of the output end output to control the O L ED display panel to emit light, and meanwhile, a high potential signal is output to the reset end of the pixel unit in the previous row and the input end of the pixel unit in the next row
A reset period: the input end is low potential, the reset end reset is high potential, the first reset switch M3, the second reset switch M3' and the fourth reset switch M4, the output end output is pulled to low potential, the line output is finished, the first capacitor C1 stores low potential, the second capacitor C2 stores high potential, and the output end output is kept connected to low potential (Vss).
According to the pixel driving circuit provided by the embodiment of the invention, the output of the pixel units in the upper row is used as the input to charge the capacitor, the output of the pixel units in the lower row is used as the reset signal, the output end of the pixel unit in the current row is pulled down to be the low potential, and the row-by-row charging among the pixels in the same column is realized, so that the pixels in the whole row can be charged by opening the GOA-free circuit, and the borderless of the O L ED display panel is further realized.
In order to implement the above embodiments, the present invention further provides a driving method of the pixel driving circuit.
Fig. 4 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the invention.
As shown in fig. 4, the driving method of the pixel driving circuit is used for realizing row-by-row driving of pixel units in the same column, and in each column of pixel units, the method includes:
in step 401, when the first clock is set to a high potential and the second clock is set to a low potential, setting the input terminal to a high potential according to a high potential signal output by the output terminal of the pixel unit in the previous row, turning on the first charging switch and the fourth reset switch, and turning off the other switches to charge the first capacitor and the second capacitor, wherein the first capacitor stores the high potential signal and the second capacitor stores the low potential signal;
in step 402, when the first clock is set to a low potential and the second clock is set to a high potential, the second charging switch is turned on, the other switches are turned off, the high potential signal stored in the first capacitor is output to the output terminal, the second driving switch is turned on according to the high potential signal stored in the first capacitor to control the light emitting layer to emit light, and the high level signal received by the output terminal is output to the reset terminal of the pixel unit in the previous row and the input terminal of the pixel unit in the next row;
in step 403, a high potential signal output by the output terminal of the next row of pixel units is received, the reset terminal is set to a high potential, and the first reset switch, the second reset switch and the fourth reset switch are turned on to set the output terminal to a low potential, at this time, the first capacitor stores a low potential signal, and the second capacitor stores a high potential signal.
It should be noted that the foregoing explanation of the embodiment of the pixel driving circuit is also applicable to the driving method of the pixel driving circuit of this embodiment, and is not repeated here.
According to the driving method of the pixel driving circuit, the output of the pixel units in the upper row is used as the input to charge the capacitor, the output of the pixel units in the lower row is used as the reset signal, the output end of the pixel unit in the current row is pulled down to be the low potential, the row-by-row charging among the pixels in the same column is realized, therefore, the pixels in the whole row can be charged by opening without a GOA circuit, and the frameless structure of the O L ED display panel is further realized.
In order to implement the above embodiments, the present invention further provides an organic light emitting diode display panel including the pixel driving circuit of the above embodiments.
In order to implement the above embodiments, the present invention also provides a display device, including: the organic light emitting diode display panel and the controller as in the above embodiments; the controller is used for controlling the active matrix organic light emitting diode display panel to display, and comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, and when the processor executes the program, the driving method of the pixel driving circuit is realized.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A pixel driving circuit is characterized by comprising a plurality of rows and a plurality of columns of pixel units, each pixel unit comprises a transfer unit and a driving unit, the transfer unit comprises an input end, a first capacitor, a first clock and a second clock, the driving unit comprises an output end and a light emitting layer, and in each column of pixel units, when the first clock in the pixel unit in the current row is at a high potential and the second clock is at a low potential, the first capacitor is controlled to be charged according to a high potential signal output by the output end of the pixel unit in the previous row; when the first clock is at a low potential and the second clock is at a high potential, the first capacitor outputs the stored high potential signal to the output end so as to control the luminescent layer to emit light according to the stored high potential signal; and resetting according to the high potential signal output by the output end of the pixel unit in the next row, and setting the output end of the pixel unit in the current row to be a low potential so as to realize the row-by-row driving of the pixel units in the same column.
2. The pixel driving circuit according to claim 1, wherein the input terminal comprises a first input terminal and a second input terminal, the transfer unit further comprising: a first charge switch and a second charge switch, first to fourth reset switches, and a second capacitor, wherein,
the grid electrode of the first charging switch is connected with the first input end, the source electrode of the first charging switch is connected with the first clock, the drain electrode of the first charging switch is respectively connected with one end of the first capacitor, the source electrode of the second charging circuit and the source electrode of the first reset switch, the other end of the first capacitor is connected with zero potential, the grid electrode of the second charging switch is connected with the second clock, the drain electrode of the second charging switch is connected with the source electrode of the second reset switch, the drain electrodes of the first reset switch and the second reset switch are both connected with low potential, the grid electrodes of the first reset switch and the second reset switch are both connected with one end of the second capacitor, the other end of the second capacitor is connected with low potential, the grid electrode of the third reset switch is connected with reset end, and the source electrode of the third reset switch is connected with high potential, the drain electrodes of the third reset switch and the fourth reset switch are connected with one end of the second capacitor, the grid electrode of the fourth reset switch is connected with the second input end, and the source electrode of the fourth reset switch is connected with a low potential.
3. The pixel driving circuit according to claim 2, wherein the driving unit further comprises a first driving switch, a second driving switch, and a third capacitor, wherein,
the drain electrode of the first driving switch is connected with a high potential, the source electrode of the first driving switch is connected with the anode of the luminous layer, the cathode of the luminous layer is connected with a low potential, the grid electrode of the first driving switch and the drain electrode of the second driving switch are both connected with one end of the third capacitor, the other end of the third capacitor is connected with the low potential, the source electrode of the second driving switch is connected with a data signal, and the grid electrode of the second driving switch is respectively connected with the drain electrode of the second charging switch and the output end.
4. A method of driving a pixel driving circuit according to any one of claims 1 to 3, wherein the method is used to implement row-by-row driving of pixel units in the same column, and in each column of pixel units, the method comprises:
when a first clock is set to be a high potential and a second clock is set to be a low potential, setting an input end to be the high potential according to a high potential signal output by an output end of a pixel unit in the previous row, opening a first charging switch and a fourth resetting switch, and closing other switches so as to charge a first capacitor and a second capacitor, wherein the first capacitor stores a high potential signal, and the second capacitor stores a low potential signal;
when the first clock is set to be a low potential and the second clock is set to be a high potential, the second charging switch is turned on, other switches are turned off, a high potential signal stored by the first capacitor is output to an output end, the second driving switch is turned on according to the high potential signal stored by the first capacitor to control the light-emitting layer to emit light, and meanwhile, the high level signal received by the output end is output to the reset end of the pixel unit in the upper row and the input end of the pixel unit in the next row;
and receiving a high potential signal output by the output end of the next row of pixel units, setting the reset end to be a high potential, and opening the first reset switch, the second reset switch and the fourth reset switch to set the output end to be a low potential, wherein at the moment, the first capacitor stores a low potential signal, and the second capacitor stores a high potential signal.
5. An organic light emitting diode display panel comprising the pixel driving circuit according to any one of claims 1 to 3.
6. A display device, comprising: an organic light emitting diode display panel and a controller according to claim 5;
the controller is used for controlling the organic light emitting diode display panel to display, and comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the driving method of the pixel driving circuit is realized according to claim 4.
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| CN109637450A (en) * | 2019-01-09 | 2019-04-16 | 合肥京东方显示技术有限公司 | Pixel-driving circuit and its driving method, display device |
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