CN114005394B - Array substrate, array substrate driving method, display panel and display - Google Patents
Array substrate, array substrate driving method, display panel and display Download PDFInfo
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- CN114005394B CN114005394B CN202111168568.0A CN202111168568A CN114005394B CN 114005394 B CN114005394 B CN 114005394B CN 202111168568 A CN202111168568 A CN 202111168568A CN 114005394 B CN114005394 B CN 114005394B
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- 239000000758 substrate Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010586 diagram Methods 0.000 description 15
- 230000000630 rising effect Effects 0.000 description 15
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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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
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses an array substrate, an array substrate driving method, a display panel and a display, and relates to the technical field of display. The array substrate comprises pixel units and a plurality of data lines which are distributed in an array manner, wherein each pixel unit is connected with the corresponding data line; the pre-charging circuit is used for providing a first voltage for the pixel unit through the data line in a first time period when the pixel unit enters a positive polarity driving period, wherein the duration of the first time period is less than the duration of the positive polarity driving period, and the first voltage is greater than the data voltage provided by the data line. The pixel unit can be precharged by the first voltage when entering the positive polarity driving period, and the normal data voltage is recovered after the pixel unit is precharged for a period of time, so that the pixel unit is continuously charged to the preset voltage value, and the charging efficiency is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to an array substrate, an array substrate driving method, a display panel and a display.
Background
In the tft-lcd, each pixel unit is connected to a corresponding data line, and a data driving circuit outputs a data voltage to each pixel unit through the data line, so that each pixel unit displays with a corresponding brightness. However, the data lines have a larger capacitance value due to their own material, so that when the polarity is reversed, the data driving circuit needs more charges to switch the polarity of the whole data line from negative to positive, and the charging efficiency of the pixel unit is slower.
Disclosure of Invention
The invention provides an array substrate, and aims to solve the technical problem that in the prior art, when a data line is subjected to polarity inversion, pixel units are low in charging efficiency.
In order to achieve the above object, the present invention provides an array substrate, which includes pixel units and a plurality of data lines distributed in an array, wherein each pixel unit is connected to a corresponding data line, and further includes a pre-charging circuit connected to each data line;
the pre-charging circuit is used for providing a first voltage for the pixel unit through the data line in a first time period when the pixel unit enters a positive polarity driving period, wherein the duration of the first time period is less than the duration of the positive polarity driving period, and the first voltage is greater than the data voltage provided by the data line.
Optionally, the pre-charging circuit includes a plurality of switch circuits and a control circuit, each data line is connected to at least one switch circuit, a first connection end of the switch circuit is connected to the corresponding data line, and a control end of the switch circuit is connected to the control circuit;
the second connecting end of the switch circuit is used for connecting a first voltage;
and the control circuit is used for sending a conduction signal to the control end in a first time period when the pixel unit enters a positive polarity driving period so as to communicate the first connecting end with the second connecting end.
Optionally, the array substrate further includes a plurality of scan lines, and the second connection end of the switch circuit is connected to the corresponding scan line.
Optionally, each switch circuit is arranged in one-to-one correspondence with each pixel unit, a first connection end of the switch circuit is connected with the data line connected to the corresponding pixel unit, and a second connection end of the switch circuit is connected with the scan line connected to the corresponding pixel unit.
Optionally, the control terminals of the switch circuits in the same row are connected to each other.
Optionally, the switch circuit includes an MOS transistor, a drain of the MOS transistor serves as the first connection end, a source of the MOS transistor serves as the second connection end, and a gate of the MOS transistor serves as the control end.
In order to achieve the above object, the present invention further provides a driving method of an array substrate, where the array substrate includes pixel units and a plurality of data lines distributed in an array, each pixel unit is connected to a corresponding data line, and the driving method of the array substrate includes the following steps:
when the pixel unit enters a positive polarity driving period, supplying a first voltage to the pixel unit through the data line in a first time period;
and providing a data voltage to the pixel unit through the data line in a second time period in a positive polarity driving period, wherein the first voltage is greater than the data voltage, and the duration of the positive polarity driving period is equal to the sum of the durations of the first time period and the second time period.
Optionally, the array substrate further includes a plurality of scan lines, each pixel unit is connected to a corresponding scan line,
when the pixel unit enters into the positive polarity drive period, providing a first voltage to the pixel unit through the data line in a first time period, including:
when the pixel unit enters a positive polarity driving period, acquiring the scanning voltage of a scanning line corresponding to the pixel unit in a first time period;
the scanning voltage is used as a first voltage, and the first voltage is transmitted to the pixel unit through the data line.
In order to achieve the above object, the present invention further provides a display panel, which includes a timing control circuit, a data driving circuit, a scan driving circuit, and the array substrate as described above, wherein the array substrate includes a pre-charge circuit, and the timing control circuit is respectively connected to the data driving circuit, the scan driving circuit, and the pre-charge circuit.
In order to achieve the above object, the present invention further provides a display, which includes the display panel and a backlight module, wherein the backlight module is disposed on a back surface of the display panel, and the backlight module is used for providing a backlight source for the display panel.
In the invention, a precharge circuit is arranged in the array substrate to provide a first voltage to the pixel unit through the data line in a first time period when the pixel unit enters a positive polarity driving period, wherein the duration of the first time period is less than that of the positive polarity driving period, and the first voltage is greater than the data voltage provided by the data line. The pixel unit can be precharged by the first voltage when entering the positive polarity driving period, and the normal data voltage is recovered after the pixel unit is precharged for a period of time, so that the pixel unit is continuously charged to the preset voltage value. The pixel unit is charged by high voltage in the initial charging stage, so that the charging speed is higher than that of the pixel unit charged by data voltage, the charging efficiency is improved, and the pixel unit can reach the preset voltage more quickly.
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 structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an array substrate according to a first embodiment of the invention;
FIG. 2 is a schematic diagram of a pixel driving signal according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an array substrate according to a second embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an array substrate according to a third embodiment of the present invention;
FIG. 5 is a schematic diagram of another embodiment of a pixel driving signal according to the present invention;
FIG. 6 is a schematic flowchart illustrating a driving method of an array substrate according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a display according to an embodiment of the invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
50 | |
| 20 | |
60 | |
| 30 | |
70 | |
| 301 | |
80 | |
| 302 | |
90 | |
| 40 | |
100 | Backlight module |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
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.
It should be noted that all directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are 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 of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an array substrate according to a first embodiment of the present invention. The invention provides a first embodiment of an array substrate.
In the first embodiment, the array substrate includes pixel units 10 and a plurality of data lines 20 distributed in an array, each pixel unit 10 is connected to a corresponding data line 20, and the array substrate further includes a pre-charge circuit 30, and the pre-charge circuit 30 is connected to each data line 20. The precharge circuit 30 is configured to provide a first voltage to the pixel unit 10 through the data line 20 in a first time period when the pixel unit 10 enters the positive polarity driving period, wherein a duration of the first time period is less than a duration of the positive polarity driving period, and the first voltage is greater than the data voltage provided by the data line 20.
It is understood that, in the array substrate, each pixel unit 10 is connected to the data line 20 and the scan line 40 through a TFT (Thin Film Transistor) device. Wherein, the data line 20 is connected with the data driving circuit; the scan lines 40 are connected to a scan driving circuit, such as a Gate driver on Array (GOA) circuit. The scan driving circuit applies a scan signal to the scan line 40 to turn on the TFT devices corresponding to the pixel units 10 row by row, and the data driving circuit applies a data signal to the data line 20, so that a corresponding data voltage is applied to the pixel units 10 through the TFT devices, and the pixel units 10 are charged under the action of the data voltage, and the potential thereof gradually reaches a corresponding voltage value.
In general, the pixel unit 10 is driven by polarity inversion, that is, the polarities of the pixel unit 10 in two adjacent frames are opposite; the polarity inversion process includes inversion from positive to negative polarity and from negative to positive polarity. In a specific implementation, the polarity inversion driving method includes row inversion driving, column inversion driving, frame inversion driving, and dot inversion driving.
In this embodiment, the positive polarity driving period refers to that the pixel unit 10 is in a positive polarity voltage driving state within one frame time, and the process of the pixel unit 10 entering the positive polarity driving period is to turn on the TFT device corresponding to the pixel unit 10 and wait for the corresponding data voltage to be input. Specifically, the scan driving circuit outputs a scan signal to the scan line 40 to turn on the TFT device; while the data driving circuit charges the pixel cell 10 by applying a positive voltage on the data line 10, thereby making the pixel cell 10 positive.
Referring to fig. 2, fig. 2 is a schematic diagram of a pixel unit driving signal according to an embodiment of the invention. As shown in fig. 2, Gate is a scan signal, Date is a data signal, and t is a time difference between a rising edge of the scan signal and an adjacent rising edge of the data signal. When the pixel cell 10 is driven with a signal as shown in fig. 2, the pixel cell 10 turns on corresponding to the TFT device when the rising edge of the Gate comes, and since Date is a positive voltage during the TFT on period, the pixel cell 10 enters a positive polarity driving period when the rising edge of the Gate comes.
In this embodiment, to improve the charging efficiency of the pixel unit 10, when the pixel unit 10 enters the positive polarity driving period, a first voltage greater than the data voltage output by the data driving circuit is provided for the pixel unit 10 in a first time period; for example, if the data voltage is 10V, the first voltage may be 15V. Since the voltage value of the first voltage is large, the pixel unit 10 can be charged more quickly than the data voltage. Referring to fig. 2, the starting time of the first time period may be a rising edge of the scanning signal, the first time period may be a time period corresponding to t, and specific time of the first time period may be set according to requirements, which is not limited in this embodiment.
In a specific implementation, the output terminals of the pre-charge circuit 30 are respectively connected to the data lines 20, and the pre-charge circuit 30 may include a preset power supply having a voltage value greater than a voltage value of the data voltage applied to the data lines 20 by the data driving circuit. When the pixel cell 10 enters the positive polarity driving period, the precharge circuit 30 converts and outputs a preset power to the data line 20 to which the pixel cell 10 is connected to apply a first voltage to the pixel cell 10; and stopping outputting the first voltage after the duration time reaches the preset time.
When the precharge circuit 30 applies the first voltage to the corresponding data line 20, the data driving circuit stops outputting the data voltage to the data line 20; after the precharge circuit 30 outputs the first voltage, the data driving circuit outputs the data voltage on the data line 20. In order to avoid abnormal display of the pixel unit, when the data driving circuit stops outputting the data voltage, the voltage value of the pixel unit 10 should be smaller than the voltage value of the subsequent data voltage, that is, the time of the first time period cannot progress, so as to prevent the pixel unit 10 from being overcharged.
In the first embodiment, the precharge circuit 30 is disposed in the array substrate to provide a first voltage to the pixel unit 10 through the data line 20 in a first time period when the pixel unit 10 enters a positive polarity driving period, wherein the duration of the first time period is less than the duration of the positive polarity driving period, and the first voltage is greater than the data voltage provided by the data line 20. In this embodiment, when the pixel unit 10 enters the positive polarity driving period, the pixel unit 10 is precharged by the first voltage, and after the precharge period, the normal data voltage is recovered, so that the pixel unit 10 is continuously charged to the preset voltage value. Since the pixel unit 10 is charged with a high voltage at the initial stage of charging, a charging speed faster than that of charging with a data voltage is obtained, and the charging efficiency is improved, so that the pixel unit 10 reaches a preset voltage more quickly.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an array substrate according to a second embodiment of the invention. Based on the first embodiment, the invention provides a second embodiment of the array substrate.
In the second embodiment, the precharge circuit 30 includes a plurality of switch circuits 301 and a control circuit 302, each data line 20 is connected to at least one switch circuit 301, a first connection terminal of the switch circuit 301 is connected to the corresponding data line 20, and a control terminal of the switch circuit 301 is connected to the control circuit 302. A second connection of the switching circuit 301 is used for connecting a first voltage. The control circuit 302 is configured to send a conducting signal to the control terminal in a first time period when the pixel unit 10 enters the positive polarity driving period, so that the first connection terminal is connected to the second connection terminal.
It should be noted that, for convenience of control, each data line 20 is connected to at least one switching circuit 301, and when the corresponding pixel unit 10 of a certain data line 20 enters a positive polarity driving period, the control circuit 302 controls the switching circuit corresponding to the data line 20 to be turned on, so as to transmit the first voltage to the data line 20 to charge the pixel unit 10.
In particular implementations, the control circuit 302 may be coupled to a timing control circuit in the array substrate. It is understood that the timing control circuit is connected to the data driving circuit and the scan driving circuit, and sends corresponding control signals to the data driving circuit and the scan driving circuit, respectively, to drive each pixel unit 10. Since the timing control circuit can control the time when each pixel unit 10 enters the positive polarity driving period, it is more convenient to send a corresponding control signal to the corresponding switch circuit 301 when the pixel unit 10 enters the positive polarity driving period, so as to control the switch circuit 301 to be turned on.
It should be noted that the second end of each switch circuit 301 may be connected to a predetermined power source, which may be a power supply of the array substrate. The switch circuit 301 may convert (e.g., step down or step up) the preset power to obtain a first voltage, and transmit the first voltage to the corresponding data line 20 when the switch circuit is turned on.
In this embodiment, in order to further reduce the power consumption of the array substrate, the first voltage may be set as the scan voltage on the scan line 40, that is, the second connection terminal of the switch circuit 301 is connected to the corresponding scan line 40.
It should be noted that the scan voltage is generally greater than the data voltage, and therefore, the pixel unit 10 can be charged by using the scan voltage, so that the charging efficiency of the pixel unit 10 is improved without increasing the power consumption of the array substrate.
In a specific implementation, since the scanning mode of the array substrate is generally progressive scanning, in order to obtain the first voltage more stably, a power supply circuit connected to each row of the scanning lines 40 needs to be further provided in the precharge circuit 30, and the power supply circuit can output the voltage of each row of the scanning lines 40 in the form of "and". For example, the output circuits are provided on the respective scanning lines 40, a diode is provided on the output circuit, the output circuits are connected in parallel, and the output terminals connected in parallel are connected to the respective switching circuits 301, so that the switching circuits 301 can be supplied with the first voltage during the entire driving period.
In the second embodiment, the precharge circuit 30 includes a plurality of switch circuits 301 and a control circuit 302; a second connection terminal of the switching circuit 301, configured to be connected to a first voltage; the control circuit 302 is configured to send a conducting signal to the control terminal in a first time period when the pixel unit 10 enters the positive polarity driving period, so that the first connection terminal is connected to the second connection terminal. In this embodiment, at least one switching circuit 301 is provided for each data line 20 to control the accessed first voltage, so that the charging process of the pixel unit 10 can be more conveniently controlled.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a third embodiment of an array substrate according to the invention. Based on the first embodiment and the second embodiment, the present invention provides a third embodiment of an array substrate.
In the third embodiment, each of the switch circuits 301 is disposed in one-to-one correspondence with each of the pixel units 10, a first connection terminal of the switch circuit 301 is connected to the data line 20 to which the corresponding pixel unit 10 is connected, and a second connection terminal of the switch circuit 301 is connected to the scan line 40 to which the corresponding pixel unit 10 is connected.
When the array substrate adopts row inversion driving or dot inversion driving, the polarities of two adjacent pixel units 10 in each column of pixels are opposite. Therefore, in the same frame, the pixel cells 10 in each column are inverted from negative polarity to positive polarity and from positive polarity to negative polarity at the same time, and the voltage on the data line 20 is inverted for a certain period of time. At this time, in the present embodiment, in order to more conveniently control the pixel unit 10 entering the positive polarity driving period, the switching circuit 301 is provided for each pixel unit to control the pixel unit 10 individually.
Referring to fig. 5, fig. 5 is a schematic diagram of another embodiment of a driving signal for a pixel unit according to the present invention. As shown in fig. 5, Gate1, Gate2 and Gate3 are scan signals corresponding to adjacent 3 rows of pixel cells 10, Date is a data signal, and t is a time difference between a rising edge of the scan signal and an adjacent rising edge of the data signal. When the pixel cells 10 in the adjacent 3 rows are driven with the signals shown in fig. 5, the pixel cells 10 in the first row are turned on corresponding to the TFT devices when the rising edge of the Gate1 comes, and since Date is a positive voltage during the TFT on period, the pixel cells 10 in the first row enter the positive polarity driving period when the rising edge of the Gate comes. When the rising edge of Gate2 arrives, the second row of pixel cells 10 are turned on corresponding to the TFT devices, and during the TFT on period, Date is a negative voltage, so the first row of pixel cells 10 enter a negative polarity driving period. The third row of pixel cells 10 is the same as the first row of pixel cells.
It should be noted that, the polarity of the first voltage source and the scan line 40 is positive. Therefore, in order to avoid the influence on the polarity of the second row of pixel units 10, when the TFT device corresponding to the second row of pixel units 10 is turned on, the switch circuit 301 corresponding to the second row of pixel units 10 is turned off, that is, the first voltage is not supplied, and the second row of pixel units 10 are charged only according to the data voltage. When the first row or the third row of pixel cells 10 enters the positive polarity driving period, the corresponding switching circuit 301 is turned on during the time period t, providing the first voltage.
In this embodiment, to reduce the cost, the switch circuit 301 may include a MOS transistor, a drain of the MOS transistor is used as the first connection terminal, a source of the MOS transistor is used as the second connection terminal, and a gate of the MOS transistor is used as the control terminal.
When the pixel unit 10 enters the positive polarity driving period, the control circuit 302 sends a control signal to the corresponding MOS transistor to turn on the MOS transistor, and the control signal may be a low level signal. After the MOS transistor is turned on, the scan voltage applied to the scan line 40 connected to the pixel unit 10 is transmitted to the scan line 20 connected to the pixel unit 10, thereby charging the pixel unit 10. Similarly, the control circuit 302 may also be coupled to a timing control circuit, which is not limited in this embodiment.
It can be understood that when the array substrate adopts a row inversion driving method, the polarities of the pixel units 10 in the same row in the same frame are the same. Therefore, for easier driving, the control terminals of the switch circuits 301 located in the same row may be connected to each other. I.e. the gates of the MOS transistors of the same row of pixel cell pairs 10 are connected to each other and to the control circuit 302. Therefore, the control circuit 302 can control the on or off of one row of MOS tubes through one control signal, and the control efficiency is improved.
In the third embodiment, each switch circuit 301 is provided in one-to-one correspondence with each pixel unit 10, a first connection terminal of the switch circuit 301 is connected to the data line 20 connected to the corresponding pixel unit 10, and a second connection terminal of the switch circuit 301 is connected to the scan line 40 connected to the corresponding pixel unit 10. In this embodiment, the corresponding switch circuit 301 is provided for each pixel unit 10, so that the voltage polarity of each pixel unit 10 can be controlled, and thus the present embodiment is suitable for more driving methods and improves the control efficiency.
Referring to fig. 6, fig. 6 is a schematic flow chart illustrating an array substrate driving method according to an embodiment of the invention. Based on the above hardware structure, the present invention provides an embodiment of a driving method for an array substrate.
In this embodiment, the structure of the array substrate may refer to the above-mentioned embodiment, and the driving method of the array substrate includes the following steps:
step S10: when the pixel unit enters into the positive polarity driving period, a first voltage is provided to the pixel unit through the data line in a first time period.
It can be understood that the pixel unit is driven in a polarity inversion manner, that is, the polarities of the pixel unit in two adjacent frames are opposite; the polarity inversion process includes inversion from positive to negative polarity and from negative to positive polarity. In a specific implementation, the polarity inversion driving method includes row inversion driving, column inversion driving, frame inversion driving, and dot inversion driving.
In this embodiment, the positive polarity driving period refers to that the pixel unit is in a positive polarity voltage driving state within one frame time, and the process of the pixel unit entering the positive polarity driving period is that the TFT device corresponding to the pixel unit is turned on and waits for the input of the corresponding data voltage. Specifically, the scanning driving circuit outputs a scanning signal to the scanning line to turn on the TFT device; at the same time, the data driving circuit charges the pixel cell by applying a positive voltage to the data line, thereby making the pixel cell positive in polarity.
Referring to fig. 2, fig. 2 is a schematic diagram of a pixel unit driving signal according to an embodiment of the invention. As shown in fig. 2, Gate is a scan signal, Date is a data signal, and t is a time difference between a rising edge of the scan signal and an adjacent rising edge of the data signal. When the pixel cell is driven with the signal shown in fig. 2, the pixel cell turns on the TFT device at the rising edge of the Gate, and Date is a positive voltage during the TFT turning on period, so that the pixel cell enters a positive polarity driving period at the rising edge of the Gate.
It should be noted that, in order to improve the charging efficiency of the pixel unit, when the pixel unit enters the positive polarity driving period, a first voltage greater than the data voltage output by the data driving circuit is provided for the pixel unit in a first time period; for example, if the data voltage is 10V, the first voltage may be 15V. Since the voltage value of the first voltage is large, the pixel unit can be charged more quickly than the data voltage. Referring to fig. 2, the starting time of the first time period may be a rising edge of the scanning signal, the first time period may be a time period corresponding to t, and specific time of the first time period may be set according to requirements, which is not limited in this embodiment.
In this embodiment, in order to further reduce the power consumption of the array substrate, the first voltage may be a scan voltage on a scan line in the array substrate. Specifically, step S10 may be: when the pixel unit enters a positive polarity driving period, acquiring the scanning voltage of a scanning line corresponding to the pixel unit in a first time period; the scanning voltage is used as a first voltage, and the first voltage is transmitted to the pixel unit through the data line.
It should be noted that, each row of pixel units in the array substrate usually adopts a row-by-row scanning driving manner. Therefore, when a pixel unit is driven, only the scan line connected to the pixel unit has a high voltage. Therefore, the pixel unit can be charged with the high voltage on the scan line as the first voltage. Specifically, an electrical loop connecting the scan line and the data line is preset for each pixel unit, and when the pixel unit enters a positive polarity driving period, the corresponding electrical loop is opened, so that the scan voltage on the scan is transmitted to the data line.
Step S20: and providing a data voltage to the pixel unit through the data line in a second time period in a positive polarity driving period, wherein the first voltage is greater than the data voltage, and the duration of the positive polarity driving period is equal to the sum of the durations of the first time period and the second time period.
The data voltage is a voltage converted by the data driving circuit according to the video data, and the pixel unit performs display according to the data voltage, so that the array substrate displays a picture corresponding to the video data. In order to protect the safety of the device, when a first voltage exists on the data line, the data driving circuit does not output a data voltage; and after the first voltage disappears, the data driving circuit outputs the data voltage again. The start time of the second period may be the end time of the first period, and the end time of the second period may be the end time of the positive polarity driving period.
In a specific implementation, the charging time of the data voltage may be reduced by setting the charging time in the data driving circuit, so that after the TFT corresponding to the pixel unit is turned on, there is no first time period for outputting the data voltage in the first time period, and the first time period is the shortened charging time of the data voltage.
In the present embodiment, by supplying the first voltage to the pixel cell through the data line for the first period of time when the pixel cell enters the positive polarity driving period; and providing a data voltage to the pixel unit through the data line in a second time period in the positive polarity driving period, wherein the first voltage is greater than the data voltage, and the duration of the positive polarity driving period is equal to the sum of the durations of the first time period and the second time period. According to the embodiment, when the pixel unit enters the positive polarity driving period, the pixel unit is precharged by the first voltage, and after the pixel unit is precharged for a period of time, the normal data voltage is recovered, so that the pixel unit is continuously charged to the preset voltage value. The pixel unit is charged by high voltage in the initial charging stage, so that the charging speed is higher than that of the pixel unit charged by data voltage, the charging efficiency is improved, and the pixel unit can reach the preset voltage more quickly.
In order to achieve the above object, the present invention further provides a display panel. Referring to fig. 7, fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present invention. The display panel includes a timing control circuit 50, a data driving circuit 60, a scan driving circuit 70 and the array substrate 80 as described above, the array substrate 80 includes a pre-charge circuit 30, and the timing control circuit 50 is connected to the data driving circuit 60, the scan driving circuit 70 and the pre-charge circuit 30 respectively. The specific structure of the array substrate 80 refers to the above embodiments, and since the display panel can adopt the technical solutions of all the embodiments, the display panel at least has the beneficial effects brought by the technical solutions of the embodiments, and details are not repeated herein.
In order to achieve the above object, the present invention further provides a display. Referring to fig. 8, fig. 8 is a schematic structural diagram of a display according to an embodiment of the present invention. The display includes the display panel 90 and the backlight module 100, the backlight module 100 is disposed on the back of the display panel 90, and the backlight module 100 is used for providing a backlight source for the display panel 90. The specific structure of the display panel 90 refers to the above embodiments, and since the display can adopt the technical solutions of all the above embodiments, the display at least has the beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (7)
1. An array substrate comprises pixel units and a plurality of data lines which are distributed in an array, wherein each pixel unit is connected with the corresponding data line;
the precharge circuit is used for providing a first voltage to the pixel unit through the data line in a first time period when the pixel unit enters a positive polarity driving period, wherein the duration of the first time period is less than the duration of the positive polarity driving period, and the first voltage is greater than the data voltage provided by the data line;
the pre-charging circuit comprises a plurality of switch circuits and a control circuit, each data line is connected with at least one switch circuit, a first connecting end of each switch circuit is connected with the corresponding data line, and a control end of each switch circuit is connected with the control circuit;
the second connection end of the switch circuit is used for connecting the first voltage;
the control circuit is used for sending a conducting signal to the control end in a first time period when the pixel unit enters a positive polarity driving period so as to enable the first connecting end to be communicated with the second connecting end;
the array substrate further comprises a plurality of scanning lines, and the second connecting ends of the switch circuits are connected with the corresponding scanning lines.
2. The array substrate according to claim 1, wherein each switch circuit is arranged in one-to-one correspondence with each pixel unit, a first connection end of the switch circuit is connected with a data line connected with the corresponding pixel unit, and a second connection end of the switch circuit is connected with a scan line connected with the corresponding pixel unit.
3. The array substrate of claim 2, wherein the control terminals of the switch circuits in the same row are connected to each other.
4. The array substrate according to any one of claims 1 to 3, wherein the switch circuit comprises a MOS transistor, a drain of the MOS transistor is used as the first connection terminal, a source of the MOS transistor is used as the second connection terminal, and a gate of the MOS transistor is used as the control terminal.
5. A driving method of an array substrate comprises pixel units and a plurality of data lines which are distributed in an array, wherein each pixel unit is connected with the corresponding data line, and the driving method of the array substrate is characterized by comprising the following steps:
providing a first voltage to the pixel unit through the data line in a first time period when the pixel unit enters a positive polarity driving period;
providing a data voltage to the pixel unit through the data line in a second time period in the positive polarity driving period, wherein the first voltage is greater than the data voltage, and the duration of the positive polarity driving period is equal to the sum of the durations of the first time period and the second time period;
the array substrate also comprises a plurality of scanning lines, and each pixel unit is connected with the corresponding scanning line;
the supplying a first voltage to the pixel unit through the data line in a first time period when the pixel unit enters a positive polarity driving period includes:
when the pixel unit enters a positive polarity driving period, acquiring the scanning voltage of a scanning line corresponding to the pixel unit in a first time period;
and taking the scanning voltage as the first voltage, and transmitting the first voltage to the pixel unit through the data line.
6. A display panel comprising a timing control circuit, a data driving circuit, a scan driving circuit, and the array substrate of any one of claims 1 to 4, the array substrate comprising a pre-charge circuit, the timing control circuit being connected to the data driving circuit, the scan driving circuit, and the pre-charge circuit, respectively.
7. A display, comprising the display panel of claim 6 and a backlight module, wherein the backlight module is disposed on a back surface of the display panel, and the backlight module is configured to provide a backlight source to the display panel.
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