CN114495856A - Pixel circuit, driving method thereof and display device - Google Patents
Pixel circuit, driving method thereof and display device Download PDFInfo
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- CN114495856A CN114495856A CN202210111909.9A CN202210111909A CN114495856A CN 114495856 A CN114495856 A CN 114495856A CN 202210111909 A CN202210111909 A CN 202210111909A CN 114495856 A CN114495856 A CN 114495856A
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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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The application provides a pixel circuit, a driving method thereof and a display device, wherein the pixel circuit comprises: the liquid crystal display device comprises a first switch circuit, a second switch circuit, a pixel storage capacitor and a liquid crystal unit; the first switch circuit is used for receiving a first control signal and a display signal; the second switch circuit is used for receiving a second control signal and resetting the display signal in the reset stage when the first switch circuit is closed and the second switch circuit is opened; the pixel storage capacitor is used for charging based on the display signal when the first switch circuit is turned on and the second switch circuit is turned off, and discharging when the first switch circuit is turned off and the second switch circuit is turned on; the liquid crystal unit is used for performing corresponding gray scale display and polarity inversion according to the display signal in the charging stage, so that the voltage difference spanned during the polarity inversion of the liquid crystal unit can be reduced, and further the power loss in the liquid crystal display panel and the chip is reduced.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and a display device.
Background
Display panels are playing an increasing role as important carriers for transmitting visual information in daily life. The most commonly used at present is a Liquid Crystal Display (LCD) panel.
Since the liquid crystal is ac driven, that is, for each pixel in the LCD, the polarity of the display signal corresponding to the current frame is opposite to the polarity of the display signal corresponding to the previous frame. For example, for a certain pixel point, a display signal of +5V is applied to the previous frame to perform display of a corresponding color level, and if the current frame needs to perform display of the color level, a display signal of-5V needs to be applied.
Therefore, when the pixel displays the next frame, that is, when the display signal required by the next frame is applied, the voltage with the same value and opposite polarity to the display signal corresponding to the current frame needs to be additionally applied to perform charge neutralization. Continuing with the above example, the display signal for the current frame is +5V and the display signal to be applied for the next frame is-5V. In the next frame, not only a voltage of-5V needs to be applied, but also a voltage of-5V needs to be additionally applied, that is, a voltage difference of 10V is spanned to charge the pixel point. Therefore, the crossed voltage difference is large, the charging time is long, and the power loss of the liquid crystal display panel and the chip thereof is increased.
Disclosure of Invention
The embodiments of the present application provide a pixel circuit, a driving method thereof, and a display device, so as to reduce power loss of a display panel and a chip thereof in a display process.
In order to solve the above technical problem, an embodiment of the present application provides the following technical solutions:
a first aspect of the present application provides a pixel circuit, comprising: the liquid crystal display device comprises a first switch circuit, a second switch circuit, a pixel storage capacitor and a liquid crystal unit; the first switch circuit is respectively connected with the second switch circuit, the pixel storage capacitor and the liquid crystal unit, and the second switch circuit, the pixel storage capacitor and the liquid crystal unit are mutually connected; the first switch circuit is used for receiving a first control signal and a display signal, the first control signal is used for controlling the switch of the first switch circuit, and the display signal is used for controlling the liquid crystal unit to perform different gray scale display and polarity inversion; the second switch circuit is used for receiving a second control signal, the second control signal is used for controlling the switch of the second switch circuit, and the display signal in the reset stage is reset under the condition that the first switch circuit is closed and the second switch circuit is opened; the pixel storage capacitor is used for charging based on the display signal when the first switch circuit is turned on and the second switch circuit is turned off, and discharging when the first switch circuit is turned off and the second switch circuit is turned on; and the liquid crystal unit is used for performing corresponding gray scale display and polarity inversion according to the display signal in the charging stage.
A second aspect of the present application provides a driving method of a pixel circuit, which is applied to the pixel circuit in the first aspect; the driving method includes: controlling a first switch circuit to receive a first control signal and a display signal, wherein the first control signal is used for controlling the switch of the first switch circuit, and the display signal is used for controlling the liquid crystal unit to perform different gray scale display and polarity inversion; controlling a second switch circuit to receive a second control signal, wherein the second control signal is used for controlling the switch of the second switch circuit and resetting the display signal in a reset stage when the first switch circuit is closed and the second switch circuit is opened; controlling the pixel storage capacitor to be charged based on the display signal when the first switch circuit is turned on and the second switch circuit is turned off, and controlling the pixel storage capacitor to be discharged when the first switch circuit is turned off and the second switch circuit is turned on; and controlling the liquid crystal unit to perform corresponding gray scale display and polarity inversion according to the display signal in the charging stage.
A third aspect of the present application provides a display device including the pixel circuit in the first aspect.
Compared with the prior art, according to the pixel driving circuit provided by the first aspect of the present application, one more switching circuit, that is, the second switching circuit, is added in the pixel circuit, so that the positive/negative display signal passes through the first switching circuit and charges the pixel storage capacitor under the condition that the first switching circuit is turned on and the second switching circuit is turned off, and then the liquid crystal unit can perform corresponding gray scale display and polarity inversion according to the positive/negative display signal. And when the first switch circuit is closed and the second switch circuit is opened, the second switch circuit and the pixel storage capacitor are in short circuit, so that the display signal corresponding to the pixel storage capacitor is recovered to be close to 0V, the second switch circuit is communicated with the pixel data line, and the display signal in the pixel data line is recovered to be close to 0V. And when the first switch circuit is turned on and the second switch circuit is turned off, the negative/positive display signal passes through the first switch circuit and charges the pixel storage capacitor, so that the liquid crystal unit can perform corresponding gray scale display and polarity inversion according to the negative/positive display signal. In this way, no matter whether the display signal is switched from the positive display signal to the negative display signal or from the negative display signal to the positive display signal, the corresponding display signal in the pixel storage capacitor is reset through the second switch circuit, and the display signal on the pixel data line is reset, so that when the reverse display signal is applied again, the given signal difference (i.e., the voltage difference) is reduced, that is, half of the original voltage difference, the magnitude of the voltage difference spanned during the ac driving of the liquid crystal cell can be reduced, and the power loss in the liquid crystal display panel and the chip can be further reduced. In addition, due to the reduction of the voltage difference span, the charging time of the pixel storage capacitor can be shortened, and the charging efficiency of the pixel circuit is improved.
The driving method of the pixel circuit provided by the second aspect of the present application and the display device provided by the third aspect have the same or similar advantageous effects as the pixel circuit provided by the first aspect.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a schematic structural diagram of a conventional pixel circuit;
FIG. 2 is a diagram of a driving signal of a conventional pixel circuit;
FIG. 3 is a first schematic diagram of a pixel circuit according to an embodiment of the present disclosure;
FIG. 4 is a first diagram illustrating driving signals of a pixel circuit according to an embodiment of the present disclosure;
FIG. 5 is a second schematic diagram of a pixel circuit according to an embodiment of the present disclosure;
fig. 6 is a third schematic structural diagram of a pixel circuit in the embodiment of the present application;
FIG. 7 is a second schematic diagram of driving signals of a pixel circuit according to an embodiment of the present disclosure;
FIG. 8 is a fourth schematic diagram of a pixel circuit according to an embodiment of the present disclosure;
fig. 9 is a fifth schematic structural diagram of a pixel circuit in the embodiment of the present application;
fig. 10 is a flowchart illustrating a driving method of a pixel circuit according to an embodiment of the present disclosure.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.
Currently, in a display panel, for ac driving of liquid crystal cells, a large voltage difference needs to be spanned between two frames before and after, which results in increased power loss in the liquid crystal display panel and the chip.
In view of this, in order to reduce power loss in the liquid crystal display panel and the chip, embodiments of the present application provide a pixel circuit, a driving method thereof, and a display device, in which a switch circuit is further added in the pixel circuit to complete charging of the pixel storage capacitor, and the liquid crystal unit is turned on after completing corresponding gray scale display and polarity inversion, so that a circuit where the pixel storage capacitor is located is shorted, and a display signal corresponding to the pixel storage capacitor is restored to approximately 0V. And communicating with the pixel data line so as to restore the display signal in the pixel data line to be close to 0V. Thus, when the display signal is applied to the next frame, it is not necessary to apply a signal for neutralizing the previous frame, and only the signal required for the current frame is applied. It can be seen that, by using the pixel circuit and the driving method of the pixel circuit provided in the embodiments of the present application, the signal difference (i.e., voltage difference) spanned during ac driving of the liquid crystal cell can be reduced, thereby reducing power loss in the liquid crystal display panel and the chip.
Next, a pixel circuit provided in an embodiment of the present application will be described in detail.
Fig. 1 is a schematic structural diagram of a conventional pixel circuit, and referring to fig. 1, the pixel circuit at least includes: a first switch circuit T0, a pixel storage capacitor C1, and a liquid crystal cell.
The Gate G of the first switch circuit T0 is connected to a display driver chip, the display driver chip is configured to provide a first control signal Gate, and the first control signal Gate is configured to control the first switch circuit T0 to be turned on or off. The on state means that a signal can pass through the switch circuit. The off state means that a signal cannot pass through the switch circuit. The Source S of the first switch circuit T0 is connected to a pixel data line, the pixel data line is used for providing a display signal Source, and the display signal Source is used for controlling the liquid crystal cell to perform different gray scale display and polarity inversion. The drain D of the first switch circuit T0 is connected to the first end of the pixel storage capacitor C1 and the pixel electrode of the liquid crystal cell, respectively. The second terminal of the pixel storage capacitor C1 is connected to the common electrode of the liquid crystal cell, the second terminal of the pixel storage capacitor C1 and the common electrode of the liquid crystal cell can also receive a common electrode voltage signal Vcom, the common electrode voltage signal Vcom is actually a reference voltage for the liquid crystal cell to deflect, and the difference between the display signal Source and the common electrode voltage signal Vcom is the voltage actually applied to the liquid crystal cell.
Fig. 2 is a schematic diagram of a driving signal of a conventional pixel circuit, and referring to fig. 2, in conjunction with the pixel circuit in fig. 1, a driving display process is mainly divided into two stages.
The first phase, the pixel positive frame charge phase.
The first control signal Gate is at a high level, the first switch circuit T0 is turned on, the positive display signal Source charges the pixel storage capacitor C1 and the liquid crystal unit through the first switch circuit T0, so that the pixel storage capacitor C1 presents a positive voltage, the liquid crystal unit turns over at a corresponding angle along the positive polarity direction, and then a pixel in the display panel completes display.
The second phase, the pixel negative frame charge phase (polarity inversion phase).
The first control signal Gate is at a high level, the first switch circuit T0 is turned on, the negative display signal Source charges the pixel storage capacitor C1 and the liquid crystal unit through the first switch circuit T0, so that the pixel storage capacitor C1 is at a negative voltage, and the liquid crystal unit is turned over at a corresponding angle along the direction of the negative polarity, thereby completing display of one pixel in the display panel.
Thus, the polarity inversion of the liquid crystal cell between positive and negative frames is completed once.
As can be seen, in order to enable the liquid crystal cell in the conventional pixel circuit to realize polarity inversion of positive and negative frames, a large voltage difference, that is, a voltage difference between a positive display signal and a negative display signal needs to be given. Crossing large voltage differences will undoubtedly increase the power consumption in the lcd panel and in the chip. Moreover, much charging time is wasted from the positive display signal to the negative display signal or from the negative display signal to the positive display signal, and the charging efficiency of the pixel circuit is reduced. Furthermore, the charging time is not enough, which leads to the insufficient charging of the pixel storage capacitor, and thus the display is unstable.
In order to solve the above problems, the embodiments of the present application improve the existing pixel circuit.
Fig. 3 is a first schematic structural diagram of a pixel circuit in an embodiment of the present application, and referring to fig. 3, the pixel circuit at least includes: a first switch circuit T0, a second switch circuit T2, a pixel storage capacitor C1, and a liquid crystal cell.
The first end of the first switch circuit T0 is connected to a display driver chip, the display driver chip is configured to provide a first control signal Gate, and the first control signal Gate is configured to control the first switch circuit T0 to be turned on or off. The on state means that a signal can pass through the switch circuit. The off state means that a signal cannot pass through the switch circuit. The second end of the first switch circuit T0 is connected to the pixel data line, and receives a display signal Source through the pixel data line, where the display signal Source is used to control the liquid crystal cell to perform different gray scale display and polarity inversion. The second terminal of the first switch circuit T0 is also connected to the second terminal of the second switch circuit T2 and the first terminal of the pixel storage capacitor C1, respectively. The third terminal of the first switch circuit T0 is connected to the second terminal of the second switch circuit T2, the first terminal of the pixel storage capacitor C1, and the pixel electrode of the liquid crystal cell. The first end of the second switch circuit is connected to the display driver chip, the display driver chip is further configured to provide a second control signal Bias2, and the second control signal Bias2 is configured to control the second switch circuit T2 to be turned on or turned off. The second terminal of the second switch circuit T2, the first terminal of the pixel storage capacitor C1, and the pixel electrode of the liquid crystal cell are connected to each other. The third terminal of the second switch circuit T2, the second terminal of the pixel storage capacitor C1, and the common electrode of the liquid crystal cell are connected to each other, and the third terminal of the second switch circuit T2, the second terminal of the pixel storage capacitor C1, and the common electrode of the liquid crystal cell can also receive a common electrode voltage signal Vcom.
Specifically, the first switch circuit T0 is configured to receive the first control signal Gate and the display signal Source. The first control signal Gate is used to control the switching of the first switching circuit T0. The display signal Source is used for controlling the liquid crystal unit to perform different gray scale display and polarity inversion.
The second switch circuit T2 is used for receiving a second control signal Bias 2. The second control signal Bias2 is used to control the switching of the second switch circuit T2, and resets the display signal Source in the reset phase when the first switch circuit T1 is turned off and the second switch circuit T2 is turned on.
The pixel storage capacitor C1 is used for charging based on the display signal Source when the first switch circuit T0 is turned on and the second switch circuit T2 is turned off, and for discharging when the first switch circuit T0 is turned off and the second switch circuit T2 is turned on.
The liquid crystal unit is used for performing corresponding gray scale display and polarity inversion according to the display signal Source in the charging stage.
Fig. 4 is a first schematic diagram of a driving signal of a pixel circuit in the embodiment of the present application, and referring to fig. 4, in combination with the pixel circuit in fig. 3, a driving display process is mainly divided into three stages.
The first phase, the pixel positive frame charge phase.
The first control signal Gate is at a high level, the second control signal Bias2 is at a low level, the first switch circuit T0 is turned on, the second switch circuit T2 is turned off, the positive display signal Source passes through the first switch circuit T0, and then the pixel storage capacitor C1 and the liquid crystal unit are charged, so that the pixel storage capacitor C1 presents a positive voltage, the liquid crystal unit performs corresponding angle overturning along a positive polarity direction according to the positive display signal Source, and then one pixel in the display panel completes displaying.
The second phase, the charge reset phase.
The first control signal Gate is at a low level, the second control signal Bias2 is at a high level, the first switch circuit T0 is turned off, the second switch circuit T2 is turned on, a short circuit is formed between the second switch circuit T2 and the pixel storage capacitor C1, and the common electrode voltage signal Vcom is used for resetting charges on the pixel storage capacitor C1 through the second switch circuit T2. The voltage of the pixel storage capacitor C1 after reset is pulled close to 0V by the common electrode voltage signal Vcom. At this time, the common electrode voltage signal Vcom also pulls the voltage of the display signal Source in the pixel data line to be close to 0V through the second switch circuit T2. Due to the closing of the first switch circuit T0, the liquid crystal cell still turns by a corresponding angle in the positive polarity direction according to the positive display signal Source.
The third phase, the pixel negative frame charge phase (polarity inversion phase).
The first control signal Gate is at a high level, the second control signal Bias2 is at a low level, the first switch circuit T0 is turned on, the second switch circuit T2 is turned off, and the negative display signal Source passes through the first switch circuit T0, so that the pixel storage capacitor C1 and the liquid crystal unit are charged, the pixel storage capacitor C1 is at a positive voltage, the liquid crystal unit is turned over at a corresponding angle along a negative polarity direction according to the negative display signal Source, and then a pixel in the display panel is displayed.
Thus, the polarity inversion of the liquid crystal cell between positive and negative frames is completed once.
According to the above, one more switch circuit, namely the second switch circuit, is added to the pixel circuit, so that when the first switch circuit is turned on and the second switch circuit is turned off, the positive/negative display signal passes through the first switch circuit and charges the pixel storage capacitor, and the liquid crystal unit can perform corresponding gray scale display and polarity inversion according to the positive/negative display signal. And when the first switch circuit is closed and the second switch circuit is opened, the second switch circuit and the pixel storage capacitor are in short circuit, so that the display signal corresponding to the pixel storage capacitor is recovered to be close to 0V, the second switch circuit is communicated with the pixel data line, and the display signal in the pixel data line is recovered to be close to 0V. And when the first switch circuit is turned on and the second switch circuit is turned off, the negative/positive display signal passes through the first switch circuit and charges the pixel storage capacitor, so that the liquid crystal unit can perform corresponding gray scale display and polarity inversion according to the negative/positive display signal. In this way, no matter whether the display signal is switched from the positive display signal to the negative display signal or from the negative display signal to the positive display signal, the corresponding display signal in the pixel storage capacitor is reset through the second switch circuit, and the display signal on the pixel data line is reset, so that when the reverse display signal is applied again, the given signal difference (i.e., the voltage difference) is reduced, that is, half of the original voltage difference, the magnitude of the voltage difference spanned during the ac driving of the liquid crystal cell can be reduced, and the power loss in the liquid crystal display panel and the chip can be further reduced. In addition, due to the reduction of the voltage difference span, the charging time of the pixel storage capacitor can be shortened, and the charging efficiency of the pixel circuit is improved.
Further, as a refinement and an extension of the pixel circuit shown in fig. 3, the embodiment of the present application also provides a pixel circuit. Fig. 5 is a schematic structural diagram of a pixel circuit in the embodiment of the present application, and referring to fig. 5, the pixel circuit at least includes: a first switch circuit T0, a third switch circuit T1, a second switch circuit T2, a pixel storage capacitor C1, and a liquid crystal cell.
Here, the connection relationship and the function of the first switch circuit T0, the second switch circuit T2, the pixel storage capacitor C1, and the liquid crystal cell in fig. 5 are the same as those of the first switch circuit T0, the second switch circuit T2, the pixel storage capacitor C1, and the liquid crystal cell in fig. 3, and only the third switch circuit T1 not shown in fig. 3 will be described here.
The third switch circuit T1 is located between the first switch circuit T0 and the pixel storage capacitor C1. The first end of the third switch circuit T1 is connected to the display driver chip, the display driver chip is further configured to provide a third control signal Bias1, and the third control signal Bias1 is configured to control the third switch circuit T1 to turn on or turn off. A second terminal of the third switch circuit T1 is connected to a third terminal of the first switch circuit T0 and the pixel electrode of the liquid crystal cell, and a third terminal of the third switch circuit T1 is connected to a second terminal of the second switch circuit T2 and a first terminal of the pixel storage capacitor C1.
Specifically, the third switch circuit T1 is used to receive the third control signal Bias 1. The third control signal Bias1 is used to control the switching of the third switching circuit T1.
The pixel storage capacitor C1 is used for keeping the liquid crystal cell in gray scale display and polarity inversion corresponding to the display signal Source when the first switch circuit T0 and the second switch circuit T2 are turned off and the third switch circuit T1 is turned on.
In practical applications, the first switch circuit, the second switch circuit, and the third switch circuit may be thin film transistors.
Fig. 6 is a schematic structural diagram of a pixel circuit in the embodiment of the present application, and referring to fig. 6, in the pixel circuit, a Gate G of the thin film transistor T0 is used for receiving a first control signal Gate, a Source S of the thin film transistor T0 is used for receiving a display signal Source, and the Source S of the thin film transistor T0 is further connected to the Source S of the thin film transistor T2, a first end of the pixel storage capacitor C1, and a drain D of the thin film transistor T1, respectively. The drain D of the thin film transistor T0 is connected to the source S of the thin film transistor T1 and the pixel electrode of the liquid crystal cell. The gate G of the thin film transistor T1 is used for receiving the third control signal Bias 1. The source S of the thin film transistor T1 is also connected to the pixel electrode of the liquid crystal cell, and the drain D of the thin film transistor T1 is connected to the source S of the thin film transistor T2 and the first end of the pixel storage capacitor C1, respectively. The gate G of the thin film transistor T2 is used for receiving the second control signal Bias 2. The source S of the TFT T2 is also connected to a first terminal of a pixel storage capacitor C1. The drain D of the thin film transistor T2, the second terminal of the pixel storage capacitor C1, and the common electrode of the liquid crystal cell are connected to each other and can receive a common electrode voltage signal Vcom.
Fig. 7 is a second schematic diagram of a driving signal of a pixel circuit in the embodiment of the present application, and referring to fig. 7, in combination with the pixel circuit in fig. 5 or fig. 6, a driving display process is mainly divided into four stages.
The first phase, the pixel positive frame charge phase.
The first control signal Gate is at a high level, the third control signal Bias1 is at a high level, the second control signal Bias2 is at a low level, the first switch circuit T0 and the third switch circuit T1 are turned on, the second switch circuit T2 is turned off, the positive display signal Source passes through the first switch circuit T0 and the third switch circuit T1, and then the pixel storage capacitor C1 and the liquid crystal unit are charged, so that the pixel storage capacitor C1 presents a positive voltage, and the liquid crystal unit turns over a corresponding angle along a positive polarity direction according to the positive display signal Source, and then one pixel in the display panel completes display.
And in the second stage, the pixel display maintaining stage.
The first control signal Gate is at a low level, the third control signal Bias1 is at a high level, the second control signal Bias2 is at a low level, the first switch circuit T0 and the second switch circuit T2 are turned off, the third switch circuit T1 is turned on, and the pixel storage capacitor C1 enables the liquid crystal cell to be kept in a positive polarity direction to be turned over by a corresponding angle, so that stable output of the positive display signal Source in the display panel is realized.
The third phase, the charge reset phase.
The first control signal Gate is at a low level, the third control signal Bias1 is at a low level, the second control signal Bias2 is at a high level, the first switch circuit T0 and the third switch circuit T1 are turned off, the second switch circuit T2 is turned on, a short circuit is formed between the second switch circuit T2 and the pixel storage capacitor C1, the common electrode voltage signal Vcom is used for resetting charges on the pixel storage capacitor C1 through the second switch circuit T2, and the voltage of the reset pixel storage capacitor C1 is pulled to be close to 0V by the common electrode voltage signal Vcom. At this time, the common electrode voltage signal Vcom also pulls the voltage of the display signal Source in the pixel data line to be close to 0V through the second switch circuit T2. Due to the closing of the first switch circuit T0, the liquid crystal cell still turns by a corresponding angle in the positive polarity direction according to the positive display signal Source.
The fourth phase, the pixel negative frame charging phase (polarity inversion phase).
The first control signal Gate is at a high level, the third control signal Bias1 is at a high level, the second control signal Bias2 is at a low level, the first switch circuit T0 and the third switch circuit T1 are turned on, the second switch circuit T2 is turned off, the negative display signal Source charges the pixel storage capacitor C1 and the liquid crystal unit through the first switch circuit T0 and the third switch circuit T1, so that the pixel storage capacitor C1 is at a negative voltage, and the liquid crystal unit performs corresponding angle turning along a negative polarity direction according to the negative display signal Source, so that one pixel in the display panel completes display.
Thus, the polarity inversion of the liquid crystal cell between positive and negative frames is completed once.
As can be seen from the above, by adding a switch circuit, i.e., a third switch circuit, between the first switch circuit and the pixel storage capacitor in the pixel circuit, the pixel storage capacitor enables the liquid crystal cell to maintain the current inversion when the first switch circuit and the second switch circuit are turned off and the third switch circuit is turned on, thereby realizing stable output of the display signal in the display panel. Therefore, the insufficient power supply voltage of the liquid crystal unit can be avoided, and the picture in the display panel can be displayed more stably.
Further, as a refinement and an extension of the pixel circuit shown in fig. 3, the embodiment of the present application also provides a pixel circuit. Fig. 8 is a fourth schematic structural diagram of a pixel circuit in the embodiment of the present application, and referring to fig. 8, the number of the pixel circuits is multiple. The plurality of pixel circuits respectively correspond to each pixel in the display panel. That is, in the display panel, there are a plurality of pixels. And each pixel is connected to one pixel circuit. These pixel circuits can display each pixel in the display panel, and further, display a screen in the display panel.
Specifically, a display driver chip is present in the display panel. The first switch circuit in each pixel circuit is connected to the first control circuit in the display driver chip. The first control circuit here is used to generate the first control signal and the display signal. In practice, the first control circuit includes a gate driving chip for providing the first control signal and a drain driving chip for providing the display signal. The second switch circuit in each pixel circuit is connected to the second control circuit in the display driver chip. The second control circuit here is used to generate a second control signal. The pixel storage capacitor in each pixel circuit is connected with the voltage control circuit in the display driving chip. The voltage control circuit here is used to generate a common electrode voltage signal.
Of course, if a third switching circuit is also present in the pixel circuit shown in fig. 3, as shown in fig. 5, the third switching circuit in each pixel circuit is connected to a third control circuit in the display driving chip. The third control circuit here is used to generate a third control signal.
In order to further reduce the power consumption of the display driver chip, a sharing circuit may be adopted in the display driver chip, that is, in the display panel, for each column of pixels, the corresponding pixel circuits all obtain the same display signal Source to perform the display of the corresponding column. For each row of pixels, the corresponding pixel circuit obtains the same first control signal Gate to control the first switch circuit in the pixel circuit of the corresponding row, thereby controlling the display of the corresponding row.
Fig. 9 is a schematic structural diagram of a pixel circuit in an embodiment of the present application, and referring to fig. 9, on the basis of the pixel circuit shown in fig. 5, correspondingly, in the display driving chip, the first control circuit includes a plurality of switch control circuits and a plurality of display signal control circuits. The plurality of switch control circuits can generate different first control signals, respectively. For example: gate 1, … … Gate n. The plurality of display signal control circuits can generate different display signals, respectively. For example: source 1, Source 2, … …, Source n-1, Source n. And the second control circuit may be one for generating the second control signal Bias 2. And the third control circuit may also be one for generating the third control signal Bias 1. Further, there is a voltage control circuit for generating the common electrode voltage signal Vcom.
In the pixel circuits corresponding to the pixels in the same row in the display panel, the first switch circuit T0 is connected to the same switch control circuit. I.e. receives the same first control signal Gate. In the pixel circuits corresponding to the pixels in the same column in the display panel, the first switch circuit T0 is connected to the same display signal control circuit. I.e. receives the same display signal Source.
In each pixel circuit corresponding to the display panel, the third switch circuit T1 is connected to the same third control circuit. I.e. receives the same third control signal Bias 1.
In each pixel circuit corresponding to the display panel, the second switch circuit T2 is connected to the same second control circuit. I.e. receives the same second control signal Bias 2.
In each pixel circuit corresponding to the display panel, the pixel storage capacitor C1 is connected to the same voltage control circuit. I.e. receives the same common electrode voltage signal Vcom.
In this way, by controlling the switching of the first switch circuit T0 row by row, controlling the input of the display signal row by row, and controlling the switching of the third switch circuit T1 and the second switch circuit T2 as a whole, the whole hierarchical control of each pixel circuit corresponding to the display panel is realized, and the power consumption of the display driver chip can be reduced.
It should be noted that the pixel circuit provided in the embodiments of the present application also belongs to a part of the display driver chip.
As can be seen from the above, by arranging each pixel circuit corresponding to each pixel point in the display panel, connecting the first switch circuits in the pixel circuits in the same row to the same first control circuit in the display driver chip, and further receiving the same first control signal Gate, connecting the first switch circuits in the pixel circuits in the same column to the same display signal control circuit in the display driver chip, and further receiving the same display signal Source, and connecting the second switch circuits in the pixel circuits to the same second control circuit in the display driver chip, and further receiving the same second control signal Bias2, and connecting the third switch circuits in the pixel circuits to the same third control circuit in the display driver chip, and further receiving the same third control signal Bias1, and connecting the pixel storage capacitors in the pixel circuits with the same voltage control circuit in the display driving chip, receiving the same common electrode voltage signal Vcom in the display driving chip, and pulling the voltage in the pixel storage capacitors to 0V in the charge reset stage. That is to say, the sharing circuit is adopted in the display driving chip, so that part of circuits in each pixel circuit are connected with the same control circuit, the display driving chip can carry out hierarchical control on the whole, and the power consumption of the display driving chip is further reduced.
Based on the same inventive concept, as an implementation of the pixel circuit, the embodiment of the application further provides a driving method of the pixel circuit. The driving method is applied to the pixel circuit in the above-described embodiment. Fig. 10 is a schematic flowchart of a driving method of a pixel circuit in an embodiment of the present application, and referring to fig. 10, the driving method may include:
s1001: controlling a first switch circuit to receive a first control signal and a display signal, wherein the first control signal is used for controlling the switch of the first switch circuit, and the display signal is used for controlling the liquid crystal unit to perform different gray scale display and polarity inversion;
s1002: controlling a second switch circuit to receive a second control signal, wherein the second control signal is used for controlling the switch of the second switch circuit and resetting the display signal in a reset stage when the first switch circuit is closed and the second switch circuit is opened;
s1003: controlling the pixel storage capacitor to be charged based on the display signal when the first switch circuit is turned on and the second switch circuit is turned off, and controlling the pixel storage capacitor to be discharged when the first switch circuit is turned off and the second switch circuit is turned on;
s1004: and controlling the liquid crystal unit to perform corresponding gray scale display and polarity inversion according to the display signal in the charging stage.
In other embodiments of the present application, the driving method further includes:
controlling a third switching circuit to receive a third control signal for controlling switching of the third switching circuit;
and when the first switch circuit and the second switch circuit are closed and the third switch circuit is opened, the liquid crystal unit is controlled by the pixel storage capacitor to keep gray scale display and polarity inversion corresponding to the display signal.
In other embodiments of the present application, the controlling the first switching circuit to receive the first control signal and the display signal includes:
controlling a grid electrode of the first switch circuit to receive the first control signal, and controlling a source electrode of the first switch circuit to receive the display signal;
the controlling the second switching circuit to receive a second control signal includes:
controlling a grid electrode of a second switch circuit to receive the second control signal;
the controlling the third switching circuit to receive a third control signal includes:
and controlling the grid of the third switch circuit to receive the third control signal.
In other embodiments of the present application, the controlling the first switching circuit to receive the first control signal and the display signal includes:
controlling the first switch circuit in each pixel circuit to receive the first control signal and the display signal generated by the first control circuit in the display driving chip corresponding to the display panel;
the controlling the second switching circuit to receive a second control signal includes:
controlling the second switch circuit in each pixel circuit to receive the second control signal generated by the second control circuit in the display driving chip corresponding to the display panel;
the controlling the third switching circuit to receive a third control signal includes:
controlling the third switch circuit in each pixel circuit to receive the third control signal generated by the third control circuit in the display driving chip corresponding to the display panel;
the controlling the pixel storage capacitor to charge based on the display signal and the controlling the pixel storage capacitor to discharge, comprising:
and controlling the pixel storage capacitor in each pixel circuit to receive a common electrode voltage signal generated by a voltage control circuit in a display driving chip corresponding to the display panel.
In other embodiments of the present application, the first control circuit comprises a plurality of switch control circuits for generating the first control signal and a plurality of display signal control circuits for generating the display signal;
the controlling the first switch circuit in each pixel circuit to receive the first control signal and the display signal generated by the first control circuit in the display driving chip corresponding to the display panel includes:
controlling the first switch circuits in the pixel circuits in the same row in the display panel to receive the first control signal generated by the same switch control circuit, and controlling the first switch circuits in the pixel circuits in the same column in the display panel to receive the display signal generated by the same display signal control circuit;
the controlling the second switch circuit in each pixel circuit to receive the second control signal generated by the second control circuit in the display driving chip corresponding to the display panel includes:
controlling the second switch circuit in each pixel circuit to receive the second control signal generated by the same second control circuit;
the controlling the third switch circuit in each pixel circuit to receive the third control signal generated by the third control circuit in the display driving chip corresponding to the display panel includes:
controlling the third switch circuit in each pixel circuit to receive the third control signal generated by the same third control circuit;
the controlling the pixel storage capacitor in each pixel circuit to receive the common electrode voltage signal generated by the voltage control circuit in the display driving chip corresponding to the display panel comprises:
and controlling the pixel storage capacitor in each pixel circuit to receive the common electrode voltage signal generated by the same voltage control circuit.
It is to be noted here that the above description of the method embodiment, like the above description of the circuit embodiment, has similar advantageous effects as the circuit embodiment. For technical details not disclosed in the method embodiments of the present application, reference is made to the description of the circuit embodiments of the present application for understanding.
Based on the same inventive concept, as an implementation of the pixel circuit, an embodiment of the present application further provides a display device, which may include: the pixel circuit in the above embodiment.
It is to be noted here that the above description of the embodiments of the apparatus, similar to the above description of the embodiments of the circuit, has similar advantageous effects as the embodiments of the circuit. For technical details not disclosed in the embodiments of the apparatus of the present application, reference is made to the description of the embodiments of the circuit of the present application for understanding.
The above description is only for the specific embodiments of the present application, but the scope of the present application 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 application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A pixel circuit, comprising: the liquid crystal display device comprises a first switch circuit, a second switch circuit, a pixel storage capacitor and a liquid crystal unit;
the first switch circuit is respectively connected with the second switch circuit, the pixel storage capacitor and the liquid crystal unit, and the second switch circuit, the pixel storage capacitor and the liquid crystal unit are mutually connected;
the first switch circuit is used for receiving a first control signal and a display signal, the first control signal is used for controlling the switch of the first switch circuit, and the display signal is used for controlling the liquid crystal unit to perform different gray scale display and polarity inversion;
the second switch circuit is used for receiving a second control signal, the second control signal is used for controlling the switch of the second switch circuit, and the display signal in the reset stage is reset under the condition that the first switch circuit is closed and the second switch circuit is opened;
the pixel storage capacitor is used for charging based on the display signal when the first switch circuit is turned on and the second switch circuit is turned off, and discharging when the first switch circuit is turned off and the second switch circuit is turned on;
and the liquid crystal unit is used for carrying out corresponding gray scale display and polarity inversion according to the display signal in the charging stage.
2. The pixel circuit according to claim 1, further comprising: a third switch circuit;
the third switch circuit is positioned between the first switch circuit and the pixel storage capacitor;
wherein the third switching circuit is configured to receive a third control signal, the third control signal being configured to control switching of the third switching circuit;
the pixel storage capacitor is used for enabling the liquid crystal unit to keep gray scale display and polarity inversion corresponding to the display signal when the first switch circuit and the second switch circuit are closed and the third switch circuit is opened.
3. The pixel circuit according to claim 2, wherein the first switch circuit, the second switch circuit, and the third switch circuit are all thin film transistors;
the grid electrode of the first switch circuit is used for receiving the first control signal, the source electrode of the first switch circuit is used for receiving the display signal and is respectively connected with the source electrode of the second switch circuit, the first end of the pixel storage capacitor and the drain electrode of the third switch circuit, and the drain electrode of the first switch circuit is respectively connected with the source electrode of the third switch circuit and the pixel electrode of the liquid crystal unit;
the gate of the second switch circuit is used for receiving the second control signal, the source of the second switch circuit is further connected to the drain of the third switch circuit and the first end of the pixel storage capacitor, respectively, and the drain of the second switch circuit is connected to the second end of the pixel storage capacitor and the common electrode of the liquid crystal cell, respectively, and can receive a common electrode voltage signal;
the gate of the third switch circuit is used for receiving the third control signal, the source of the third switch circuit is further connected with the pixel electrode of the liquid crystal unit, and the drain of the third switch circuit is further connected with the first end of the pixel storage capacitor.
4. The pixel circuit according to any one of claims 1 to 3, wherein the number of the pixel circuits is plural, and plural pixel circuits respectively correspond to each pixel in a display panel;
the first switch circuit in each pixel circuit is connected with a first control circuit in a display driving chip corresponding to the display panel, and the first control circuit is used for generating the first control signal and the display signal;
the second switch circuit in each pixel circuit is connected with a second control circuit in a display driving chip corresponding to the display panel, and the second control circuit is used for generating the second control signal;
and the pixel storage capacitor in each pixel circuit is connected with a voltage control circuit in a display driving chip corresponding to the display panel, and the voltage control circuit is used for generating a common electrode voltage signal.
5. The pixel circuit according to claim 4, wherein the first control circuit includes a plurality of switch control circuits capable of generating respectively different first control signals and a plurality of display signal control circuits capable of generating respectively different display signals;
the first switch circuits in the pixel circuits in the same row in the display panel are connected to the same switch control circuit, and the first switch circuits in the pixel circuits in the same column in the display panel are connected to the same display signal control circuit;
the second switch circuit in each pixel circuit is connected with the same second control circuit;
and the pixel storage capacitor in each pixel circuit is connected with the same voltage control circuit.
6. A driving method of a pixel circuit, wherein the driving method is applied to the pixel circuit according to any one of claims 1 to 5; the driving method includes:
controlling a first switch circuit to receive a first control signal and a display signal, wherein the first control signal is used for controlling the switch of the first switch circuit, and the display signal is used for controlling the liquid crystal unit to perform different gray scale display and polarity inversion;
controlling a second switch circuit to receive a second control signal, wherein the second control signal is used for controlling the switch of the second switch circuit and resetting the display signal in a reset stage when the first switch circuit is closed and the second switch circuit is opened;
controlling the pixel storage capacitor to be charged based on the display signal when the first switch circuit is turned on and the second switch circuit is turned off, and controlling the pixel storage capacitor to be discharged when the first switch circuit is turned off and the second switch circuit is turned on;
and controlling the liquid crystal unit to perform corresponding gray scale display and polarity inversion according to the display signal in the charging stage.
7. The driving method according to claim 6, further comprising:
controlling a third switching circuit to receive a third control signal for controlling switching of the third switching circuit;
and when the first switch circuit and the second switch circuit are closed and the third switch circuit is opened, the liquid crystal unit is controlled by the pixel storage capacitor to keep gray scale display and polarity inversion corresponding to the display signal.
8. The driving method according to claim 7, wherein the controlling the first switching circuit to receive the first control signal and the display signal comprises:
controlling a grid electrode of the first switch circuit to receive the first control signal, and controlling a source electrode of the first switch circuit to receive the display signal;
the controlling the second switching circuit to receive a second control signal includes:
controlling a grid electrode of a second switch circuit to receive the second control signal;
the controlling the third switching circuit to receive a third control signal includes:
and controlling the grid of the third switch circuit to receive the third control signal.
9. The driving method according to any one of claims 6 to 8, wherein the controlling the first switching circuit to receive a first control signal and a display signal includes:
controlling the first switch circuit in each pixel circuit to receive the first control signal and the display signal generated by the first control circuit in the display driving chip corresponding to the display panel;
the controlling the second switching circuit to receive a second control signal includes:
controlling the second switch circuit in each pixel circuit to receive the second control signal generated by the second control circuit in the display driving chip corresponding to the display panel;
the controlling the pixel storage capacitor to charge based on the display signal and the controlling the pixel storage capacitor to discharge, comprising:
and controlling the pixel storage capacitor in each pixel circuit to receive a common electrode voltage signal generated by a voltage control circuit in a display driving chip corresponding to the display panel.
10. A display device characterized by comprising the pixel circuit according to any one of claims 1 to 5.
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