WO2014000381A1

WO2014000381A1 - Array substrate, display device, and method for driving array substrate

Info

Publication number: WO2014000381A1
Application number: PCT/CN2012/085878
Authority: WO
Inventors: 史世明; 李云飞; 石领
Original assignee: 京东方科技集团股份有限公司
Priority date: 2012-06-28
Filing date: 2012-12-04
Publication date: 2014-01-03
Also published as: CN102749775B; CN102749775A

Abstract

An array substrate, a display device, and a method for driving the array substrate not only can implement polarity inversion but also can effectively reduce a driving voltage of a pixel electrode and a common electrode, achieving the objective of reducing power consumption. The array substrate comprises: several pixel units (14); several grid lines (11) providing a grid scanning signal for the pixel units (14); several data lines (12) providing a data signal for the pixel units (14); and several first common electrode lines (131) and several second common electrode lines (132), each first common electrode line (131) being connected to an odd-numbered columns of pixel units (141) and each second common electrode lines (132) being connected to an even-numbered columns of pixel units (142). Common voltages with inverse polarities are respectively provided for the odd-numbered columns of pixel units (141) and the even-numbered columns of pixel units (142). A polarity of a driving voltage difference loaded to any pixel unit (14) through the data line (12) and the first common electrode line (131)/the second common electrode line (132) is inverse to a polarity of a common voltage loaded to the pixel unit (14).

Description

Array substrate, display device, and method of driving the same

The present invention relates to the field of liquid crystal display, and more particularly to an array substrate, a display device, and a method of driving the array substrate.

Background technique

The liquid crystal display device is a device widely used in various electronic devices, and its display principle is to apply a voltage difference to the liquid crystal molecules, and the voltage difference generates an electric field to drive the liquid crystal molecules to be deflected. The degree of deflection of the liquid crystal molecules is controlled by the magnitude of the applied voltage difference, thereby controlling the light and darkness of the light emitted through the liquid crystal layer to display an image. The voltage difference (driving voltage difference) applied to the liquid crystal molecules must be reversed at intervals to avoid permanent polarization of the liquid crystal material and to avoid image residual effects. Therefore, various inversion methods have been proposed so far, including: frame inversion, line inversion (including line inversion and column inversion), and dot inversion.

A thin film transistor liquid crystal display device (TFT LCD) is provided with a thin film transistor (TFT) for each pixel unit, and a voltage difference is applied to the liquid crystal molecules through the TFT. A common TFT array connection of a TFT LCD is as shown in FIG. 1. In each pixel unit, an electrode for applying a voltage difference to a liquid crystal molecule and a liquid crystal sandwiched by an electrode form a capacitor Clc, and one end of the capacitor Clc is connected to the drain of the TFT. As the pixel electrode, the other end connected to the common electrode line 13 is a common electrode, the storage capacitor Cst is connected in parallel with the capacitor Clc, and the source of the TFT is connected to the data line 12, and the gate of the TFT is connected to the gate line 11. In the TFT array, the common electrode lines 13 of the entire panel are connected together and fixed to a DC voltage; Si~S ₄ are data lines 12, and the corresponding analog voltage is loaded according to the gray scale to be displayed; G^G ₃ is the gate line 11, and the gate scan signal is loaded.

According to the above TFT array connection, a driving method for realizing dot inversion is as follows: the voltages of adjacent pixel electrodes are opposite to the voltage of the common electrode, and the voltages of opposite polarities are respectively applied, and in the next frame display, each pixel electrode The polarity of the load voltage is also reversed, as shown in Figure 2. Thus, the voltage difference applied to the adjacent pixel unit is opposite in polarity, and the voltage difference applied by the same pixel unit is alternately positive and negative, and dot inversion is realized. The driving voltage (referred to as: pixel voltage) loaded on the pixel electrode is relative to the driving voltage of the common electrode (referred to as: common voltage).

In the above process, the inventors found that the prior art has at least the following problems:

The driving voltages of the existing pixel electrode and the common electrode are relatively high, so that power consumption is relatively large. example For example, if the voltage difference required for the operation of the liquid crystal cell is 0~±6V and the common voltage is set to 6V, the voltage to be loaded on the pixel electrode changes within 0~12V.

Summary of the invention

The technical problem to be solved by the present invention is to provide an array substrate, a display device and a driving method, which can achieve polarity reversal, effectively reduce the driving voltage of the pixel electrode and the common electrode, and reduce the direct current component in the driving voltage (ie, DC bias voltage), to achieve the purpose of reducing power consumption.

In order to solve the above technical problem, the embodiment of the present invention uses the following technical solution: An array substrate, comprising:

a plurality of pixel units including a thin film transistor, a pixel electrode and a common electrode; a plurality of gate lines, wherein each of the gate lines is connected to a gate of a thin film transistor in a row of pixel units; and a plurality of data lines, each of which a data line is connected to the pixel electrode in the column of pixel cells through the thin film transistor; a plurality of first common electrode lines and a plurality of second common electrode lines are connected to the common electrode in the pixel unit, wherein each of the first common The electrode lines are connected to an odd-numbered column pixel unit, and each of the second common electrode lines is connected to an even-numbered column pixel unit, and a common voltage of opposite polarity is provided to the odd-numbered column pixel unit and the even-numbered column pixel unit, respectively. a polarity of a driving voltage difference applied to any one of the pixel units through the data line and the first common electrode line/the second common electrode line, opposite to a polarity of a common voltage applied to the pixel unit .

Further, the array substrate may further include: a gate line driving circuit for applying a gate scan signal to the gate line; a data line driving circuit for applying a data signal to the data line; and a common electrode line driving circuit And applying a common voltage of opposite polarity to the first common electrode line and the second common electrode line.

Optionally, the common electrode line driving circuit includes:

a selector for outputting the preset first common voltage and the preset second common voltage to the first common electrode line and the second common electrode line according to the received polarity control signal, The polarity of the first common voltage is opposite to the polarity of the second common voltage.

Optionally, the data line driving circuit includes:

a digital-to-analog converter for selecting a set of gray-scale reference voltages for digital-to-analog conversion among the two sets of gray-scale reference voltages according to the input polarity control signal, so as to pass the data lines and the first The polarity of the driving voltage difference applied to the any of the pixel units by the common electrode line/the second common electrode line is opposite to the polarity of the common voltage applied to the pixel unit;

Wherein the two sets of gray scale reference voltages respectively correspond to the first common voltage and the second common voltage.

Optionally, the common electrode includes a plurality of connected portions, the pixel electrode is disposed under the common electrode via an insulating layer; or the pixel electrode includes a plurality of connected portions, and the common electrode is separated by an insulating layer It is disposed below the pixel electrode.

Optionally, a via hole is disposed in the insulating layer, and the common electrode is connected to the first common electrode line or the second common electrode line through a transparent conductive material disposed in the via hole. The first common electrode line or the second common electrode line is disposed in the same layer as the pixel electrode, and is located at a periphery of the pixel electrode.

Optionally, at an edge of the array substrate, the plurality of first common electrode lines are connected together to form a common voltage first input end, and the plurality of second common electrode lines are connected together to form a common voltage second input end.

According to an embodiment of the invention, there is also provided a display device comprising: any of the array substrates described.

According to an embodiment of the present invention, a method for driving the array substrate is further provided, including: when displaying a frame of a picture, sequentially turning on each row of pixel units through the gate line; and each row of pixel units is turned on, passing the data The line and the first common electrode line or the second common electrode line respectively apply opposite driving voltage differences to the odd column pixel unit and the even column pixel unit. Wherein a common voltage applied to the odd-numbered column pixel unit is opposite to a polarity of a common voltage loaded to the even-numbered column pixel unit, and a driving voltage difference applied to any of the pixel units is loaded to the pixel unit The polarity of the common voltage is reversed.

Further, the method further includes: switching the common voltage loaded to the odd-numbered column pixel unit and the common voltage loaded to the even-numbered column pixel unit once every preset time to load the device The polarities of the driving voltage differences of the odd-numbered column pixel unit and the even-numbered column pixel unit are interchanged once.

Optionally, when the pixel unit of each row is turned on, the opposite driving voltage difference is respectively loaded to the odd column through the data line, and the first common electrode line or the second common electrode line The pixel unit and the even-numbered column pixel unit specifically include:

When a row of pixel units is turned on, the common electrode of the odd-numbered column pixel unit is loaded with the first public a common voltage, the common electrode of the even-numbered column pixel unit is loaded with a second common voltage, the polarity of the first common voltage is opposite to the polarity of the second common voltage; when the next row of pixel units is turned on, The common electrode of the odd-numbered column pixel unit loads the second common voltage, and the common electrode of the even-numbered column pixel unit loads the first common voltage.

Alternatively, the common voltage applied to any of the pixel units is maintained at a predetermined level during the time when one frame of picture is displayed.

Optionally, a common voltage applied to the pixel unit through the first common electrode line or the second common electrode line is an alternating current square wave voltage signal.

According to an embodiment of the present invention, a method for driving the array substrate is further provided, including: when displaying a frame of a picture, sequentially turning on each row of pixel units through the gate line; when the pixel unit is turned on, a data line, and the first common electrode line or the second common electrode line, loading a driving voltage difference to the pixel unit, and driving the driving voltage difference pole when any two adjacent rows of the pixel unit are turned on The opposite is true, and the driving voltage difference applied to any of the pixel units is opposite to the polarity of the common voltage applied to the pixel unit; when the next frame picture is displayed, the common voltage is applied to any two adjacent rows of pixel units The polarity is swapped once to swap the polarity of the drive voltage difference applied to the pixel cells of any two adjacent rows.

When the pixel unit of each row is turned on, the driving voltage difference is loaded to the pixel unit through the data line, and the first common electrode line or the second common electrode line, and specifically includes: a row of pixel units, the common electrode of the odd column pixel unit and the common electrode of the even column pixel unit are each loaded with a first common voltage; when the next row of pixel units is turned on, the odd column of pixel units and the The common electrodes of the even-numbered column pixel units are each loaded with a second common voltage, the polarity of the first common voltage being opposite to the polarity of the second common voltage.

The array substrate, the display device, and the method for driving the array substrate according to the embodiment of the present invention use two common electrode lines, a first common electrode line and a second common electrode line, wherein the first common electrode line and the odd column pixel The unit is connected, and the second common electrode line is connected to the even-numbered column pixel unit, and provides a common voltage signal of opposite polarity to the odd-numbered column pixel unit and the even-numbered column pixel unit, wherein the data line provides a data signal to the pixel unit, and the data signal is relatively common. The voltage difference of the voltage signal, that is, the driving voltage difference, is applied to the pixel unit to generate an electric field to drive the liquid crystal molecules to deflect, and the polarity of the driving voltage difference needs to be inverted once every once, and the generated electric field direction is correspondingly reversed. Once, to avoid permanent damage caused by polarization of the liquid crystal material. Specifically, the driving voltage difference of the pixel unit is always opposite to the common voltage, and is controlled to be loaded into the pixel list by the parity column control. The polarity of the common voltage of the element is changed every once time (for example, every frame), and the driving voltage difference of the pixel unit is also changed once, and the polarity inversion can be realized, including dot inversion and column inversion. And line reversal. In addition, since the pixel unit can be loaded with two common voltages of opposite polarities through the first common electrode line and the second common electrode line, the driving voltage difference of the pixel unit is always opposite to the common voltage, when a certain pixel unit is common When the voltage is positive, the driving voltage difference loaded into the pixel unit is negative; when the common voltage is negative, the driving voltage difference loaded into the pixel unit is positive, and therefore, the gray scale is the same, and the voltage difference required for the operation of the liquid crystal cell is In the same case, a small common voltage can be set to meet the working requirements, and the pixel voltage is relative to the common voltage, which is also lower than the prior art pixel voltage. For example, if the voltage difference required for the operation of the liquid crystal cell is still 0 to ±6V, the common voltage of the opposite polarity applied to the pixel unit can be set to 5V and -2V. When the common voltage is 5V, the driving potential difference is 0-6V, then the voltage to be loaded on the pixel electrode (ie, the driving voltage of the pixel electrode, referred to as: pixel voltage) is -1~5V; when the common voltage is -2V, the driving potential difference is 0~6V, the pixel voltage changes within -2~4V, so the pixel voltage generally changes within -2~5V. Compared with 0~12V in the prior art, the pixel voltage is effectively reduced, and the common voltage is 5V. And -2V is also reduced compared to the 6 V in the prior art. Therefore, the array substrate, the display device, and the method for driving the array substrate provided by the embodiments of the present invention can achieve polarity reversal, and can effectively reduce the driving voltage of the pixel electrode and the common electrode, thereby reducing the DC bias voltage. Reduce the purpose of power consumption.

DRAWINGS

1 is a schematic diagram of a conventional TFT array connection in the prior art; FIG. 2 is a timing control diagram for implementing dot inversion in the prior art;

3 is a schematic diagram of a TFT array connection of an array substrate according to a first embodiment of the present invention; FIG. 4 is a second schematic diagram of a TFT array connection of an array substrate according to a first embodiment of the present invention; FIG. 6 is a schematic structural diagram of a data line driving circuit and a common electrode line driving circuit in the first embodiment of the present invention; FIG.

FIG. 7 is a timing chart showing the control of the output of the data line driving circuit and the common electrode line driving circuit in the first embodiment of the present invention; FIG. 8 is a schematic structural view of the prime unit in the first embodiment of the present invention; 9 is a schematic cross-sectional structural view of a specific pixel unit parallel to a gate line in the first embodiment of the present invention;

10 is a flowchart of a method for driving an array substrate according to a second embodiment of the present invention; FIG. 11 is a driving sequence for realizing dot inversion of a driving array substrate according to a second embodiment of the present invention;

FIG. 12 is a schematic diagram showing voltages when a pixel row of a first row of a first row is turned on when a liquid crystal display device of three rows and four columns is implemented in a second embodiment; FIG.

Figure 13 is a view showing the intention of realizing dot inversion in a liquid crystal display device of three rows and four columns in the second embodiment of the present invention;

Figure 14 is a schematic view showing the column inversion of the liquid crystal display device in the embodiment of the present invention. Figure 15 is a schematic view showing the line inversion of the liquid crystal display device in the embodiment of the present invention.

11-gate line, 12-data line,

13- common electrode line, 131-first common electrode line, 132-second common electrode line,

14-pixel unit, 141-odd column pixel unit, 142-even column pixel unit,

15-gate line driver circuit 16-data line driver circuit, 161-digital-to-analog converter, 17-common electrode line driver circuit, 20-thin film transistor, 21-liquid crystal,

22-pixel electrode, 23-common electrode, 24-insulation layer, 241-via.

detailed description

According to an embodiment of the present invention, an array substrate, a display device, and a driving method are provided. Under the premise of achieving polarity inversion, the driving voltages of the pixel electrode and the common electrode can be effectively reduced, and the DC bias voltage can be reduced to achieve a reduction. The purpose of power consumption.

The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

First embodiment

The embodiment provides an array substrate, and FIG. 3 is a TFT array connection of the array substrate, including: a plurality of pixel units 14 including a thin film transistor, a pixel electrode and a common electrode for displaying an image; a plurality of gate lines 11 ( Gi~G _n ), wherein each gate line 11 is connected to a gate of a thin film transistor in a row of pixel units 14 to provide a gate scan signal to the pixel unit 14; a plurality of data lines 12 (Si~S _n ) Each of the data lines 12 and the pixel electrodes of the column of pixel units 14 are connected through the thin film transistor to provide a data signal to the pixel unit 14; a plurality of first common electrode lines 131 and a plurality of second common electrode lines 132 connected to the pixels The common electrode in unit 14. Each of the first common electrode lines 131 is connected to an odd-numbered column pixel unit 141, and each of the second common electrode lines 132 is connected to an even-numbered column pixel unit 142, and supplies the poles to the odd-numbered column pixel unit 141 and the even-numbered column pixel unit 142, respectively. The opposite common voltage signal, the polarity of the driving voltage difference applied to any one of the pixel units 14 through the data line 12 and the first common electrode line 131 / the second common electrode line 132 and the common voltage applied to the pixel unit 14 The opposite polarity.

The first common electrode line 131 and the second common electrode line 132 described in this embodiment are vertically arranged as shown in FIG. 3, and are parallel to the data line 12. Optionally, at the edge of the array substrate, the plurality of first common electrode lines 131 ( Gi~G _n ) are connected together to form a common voltage first input end, and the plurality of second common electrode lines 132 ( Sj-Sn ) Connected together to form a second input of a common voltage. VCOM1 in Fig. 3 represents a common voltage signal input to the first common electrode line, and VCOM2 represents a common voltage signal input to the second common electrode line.

In the array substrate of the embodiment, the gate line 11 supplies a gate scan signal to the pixel unit 14, and the control pixel unit 14 is turned on line by line to display an image; and the data line 12 provides a data signal to the pixel unit, and the first common electrode line 131 ( Or the second common electrode line 132) supplies a common voltage to the pixel unit, thereby applying a driving voltage difference to the pixel unit, and the polarity of the driving voltage difference is always opposite to the polarity of the common voltage. By controlling the polarity of the common voltage applied to the even-numbered column pixel unit 142 by the odd-numbered column pixel unit 141 and the second common electrode line 132 applied to the first common electrode line 131, dot inversion, column inversion, and line inversion can be realized. . For example, when the first frame picture is displayed, the odd column pixel unit 141 is loaded with a positive common voltage, the driving potential difference is negative, the even column pixel unit 142 is loaded with a negative common voltage, and the driving potential difference is positive; in the second frame picture, the odd number The column pixel unit 141 is loaded with a negative common voltage, the driving potential difference is positive, the even column pixel unit 142 is loaded with a positive common voltage, and the driving potential difference is negative. If the picture of each frame is displayed, the polarity of the common voltage of the odd-numbered column pixel unit 141 and the even-numbered column pixel unit 142 remains unchanged, that is, column inversion; if each frame of picture is displayed, each row is turned on, the odd-numbered column of pixel units 141 And the polarity of the common voltage of the even-numbered column pixel unit 142 is once exchanged, and is dot inversion. It should be noted that in the above process, the polarity of the driving voltage difference always remains opposite to the polarity of the common voltage, and the common voltage Every time the polarity changes, the polarity of the driving voltage difference is kept opposite, and it changes once, which can achieve polarity reversal, effectively reduce pixel voltage and common voltage, and reduce DC offset. Voltage, to achieve the purpose of reducing power consumption.

Further, as shown in FIG. 4, the array substrate may further include a gate line driving circuit 15 for applying a gate scan signal to the gate line 11; and a data line driving circuit 16 for applying a data signal to the data line 12; The common electrode line driving circuit 17 is for applying a common voltage of opposite polarity to the first common electrode line 131 and the second common electrode line 132.

Alternatively, as shown in FIG. 5, the common electrode line driving circuit 17 may also be integrated in the data line driving circuit 16. The data line driving circuit 16 selectively applies a common voltage of opposite polarity to the first common electrode line 131 and the second common electrode line 132 in addition to the application of the gate scanning signal to the gate line 11. The common electrode line driving circuit 17 is for applying a common voltage of opposite polarity to the first common electrode line 131 and the second common electrode line 132. The specific implementation and logic circuits are various. Within the scope of the technical features disclosed in the present invention, the design of the common electrode line driving circuit 17 can be easily realized according to the driving method by any person skilled in the art. For example, it can be implemented with two single selectors or two relays.

Optionally, in a specific implementation manner, as shown in FIG. 6, the common electrode line driving circuit 17 includes:

a selector for outputting the preset first common voltage VCOMH and the preset second common voltage VCOML to the first common electrode line 131 and the second common electrode line 132 according to the received polarity control signal POL, The polarity of a common voltage VCOMH is opposite to the polarity of the second common voltage VCOML.

In this embodiment, the preset first common voltage VCOMH is positive (for example: +5V), and the preset second common voltage VCOML is negative (for example: -2V), and VCOM1 and VCOM2 in the figure also represent input to the first A common voltage signal of a common electrode line 131 and a second common electrode line 132. Different driving methods require different timing signals of VCOM1 and VCOM2, and the polarity control signal POL thus designed is also different. The specific working process and connection mode of the selector are also different. For example, when row inversion is implemented, the polarities of VCOM1 and VCOM2 are required to be changed synchronously, and the polarity of each frame is changed once, and the first common electrode line 131 and the second common electrode line 132 can be connected to the same output terminal. The polarities of VCOM1 and VCOM2 are kept changing synchronously, and the level of the polarity control signal POL is changed every frame, so that the polarities of VCOM1 and VCOM2 are synchronously changed once per frame. For example, when implementing column inversion or dot inversion, two of the selectors One output terminal, one connected to the first common electrode line, and one connected to the second common electrode line, as shown in FIG. 7, the specific working process is as follows: When the polarity control signal POL is high level, the checker output presets first The common voltage VC0MH to the first common electrode line 131 outputs a preset second common voltage VC0ML to the second common electrode line 132; when the polarity control signal POL is low level, the selector outputs VC0ML to the first common electrode line 131. Output VC0MH to the second common electrode line 132. If the level of the polarity control signal POL changes once per frame, the polarities of VC0M1 and VC0M2 are interchanged once per frame, which can be used to implement column inversion. Further, if the level of the polarity control signal POL changes according to the horizontal frequency, that is, every frame is displayed, the level of the polarity control signal POL changes once every time the pixel unit 14 is turned on, ensuring the same column of two adjacent rows. Load the opposite polarity of the positive and negative polarity to achieve dot inversion.

As shown in FIG. 6, the data line driving circuit 16 includes a digital-to-analog converter 161 for selecting a set of gray-scale reference voltages for digital-to-analog conversion among two sets of gray-scale reference voltages according to the input polarity control signal POL. Maintaining a polarity of a driving voltage difference applied to any one of the pixel units through the data line and the first common electrode line/the second common electrode line with a polarity of a common voltage applied to the pixel unit in contrast. The two sets of gray scale reference voltages (VREFH and VREFL ) required for the digital-to-analog converter 161 to perform digital-to-analog conversion correspond to the first common voltage VC0MH and the second common voltage VC0ML, respectively. In Figure 6, SCLK is the serial clock signal, Data is the grayscale signal, and LD is the data loading synchronization signal.

If the gray scales are displayed as 0, 1, 2, and 3, respectively, the required voltage difference (pixel cell driving voltage difference) corresponding to the display gray scale is 0V, ± 2V, ± 4V, and ± 6V, respectively. A common voltage VC0MH and a preset second common voltage VC0ML are respectively set to 5V and -2V, and when the common electrode of the pixel unit 14 is loaded with a negative voltage of -2V, the corresponding display gray-scale pixel electrode loading voltage (pixel voltage) is -2V, respectively. 0V, 2V, and 4V; When the common electrode is loaded with a positive voltage of 5V, the corresponding grayscale pixel voltages are 5V, 3V, IV, and -1V, respectively. Digital-to-analog converter 161 The two sets of gray-scale reference voltages VREFH and VREFL required for digital-to-analog conversion correspond to VC0ML and VC0MH, respectively. The first set of gray scale reference voltage VREFH is a pixel voltage corresponding to a preset second common voltage VCOML ( -2V ), that is, -2V, 0V, 2V, and 4V; the second set of gray scale reference voltage VREFL is preset The first common voltage VCOMH (5V) corresponds to the pixel voltages, namely 5V, 3V, IV and -1V.

The data line driver circuit output channel (1~N) is connected to the data line (S^Sn) of the TFT array, the polarity control signal POL controls the voltage polarity of the output channel, and the odd output channel and the even Several channels use VREFH and VREFL respectively. Specifically, as shown in FIG. 7, when the polarity control signal POL is at a high level, the MUX selector outputs VCOML (-2V) at VCOM1, and VCOMH (+5V) at VCOM2, and for pixel cells loaded into odd columns. The data signal (corresponding to the odd output channel of the data line driving circuit), and the digital-to-analog converter 161 performs the digital-to-analog conversion using the first set of gray-scale reference voltage VREFH corresponding to the second common voltage VCOML ( -2V ), that is, - 2V, 0V, 2V, and 4V; for the data signal loaded into the even-numbered column pixel unit (corresponding to the even-numbered output channel of the data line driving circuit), the digital-to-analog conversion is performed with the first common voltage VCOMH (+5V) Corresponding second set of gray scale reference voltages VREFL, namely 5V, 3V, IV and -1V. When the polarity control signal goes low, the odd output channel uses the second set of gray scale reference voltage VREFL, the even output channel uses the first set of gray scale reference voltage VREFH, COM1 outputs VCOMH, and VCOM2 outputs VCOML. The digital-to-analog converter 161 has various implementations. One of the alternative implementations is implemented by an alternative selector and an existing digital-to-analog conversion device. The digital-to-analog conversion device performs odd-numbered output channels/even-numbered output channels. In digital-to-analog conversion, a set of gray-scale reference voltages is selected by a selector of two choices, and then digital-to-analog conversion is performed according to the selected gray-scale reference voltages. The alternative selector selects an input to the existing digital to analog conversion device based on the polarity control signal POL input to the control terminal at two sets of gray scale reference voltages (VREFH and VREFL).

As shown in FIG. 8, the pixel unit 14 in this embodiment may include:

The thin film transistor 20 has a gate connected to the gate line 11, a source connected to the data line 12, and a drain receiving a data signal applied to the source through the channel; and a pixel connected to the drain of the thin film transistor 20. The electrode 22 and the common electrode 23 connected to the first common electrode line 131 or the second common electrode line 132. The storage capacitor Cst in the figure is a parasitic capacitance between the common electrode line and the data line.

Optionally, a specific structure of the pixel unit in this embodiment is shown in FIG. 9. The common electrode 23 includes a plurality of connected portions (slit electrodes), and the pixel electrode 22 is a whole block (plate electrode). The insulating layer 24 is disposed under the common electrode 23.

The upper slit electrode may also serve as a common electrode, and the corresponding lower plate electrode serves as a pixel electrode, that is, the pixel electrode includes a plurality of connected portions (slit electrodes), and the common electrode is disposed on the pixel electrode via an insulating layer. Below.

More specifically, the insulating layer 24 is provided with a via hole 241 through which the common electrode is disposed.

The transparent conductive material in 241 is connected to the first common electrode line 131 or the second common electrode line 132, the first common electrode line 131 or the second common electrode line 132 is disposed in the same layer as the pixel electrode 22 and is located at the periphery of the pixel electrode 22.

FIG. 9 is a diagram showing a pixel unit structure according to an embodiment of the present invention, which is suitable for an advanced super-dimension field switching (ADS) or an in-plane conversion (In-Plane Switcb, IPS) mode liquid crystal. Display device array substrate. The advanced super-dimensional field conversion technology forms a multi-dimensional electric field by the electric field generated by the edge of the slit electrode in the same plane and the electric field generated between the slit electrode layer and the plate electrode layer, so that all the slit electrodes between the liquid crystal cell and the electrode are directly above The oriented liquid crystal molecules are capable of rotating, thereby improving the liquid crystal working efficiency and increasing the light transmission efficiency. Advanced super-dimensional field switching technology can improve the picture quality of TFT-LCD products, with high resolution, high transmittance, low power consumption, wide viewing angle, high aperture ratio, low chromatic aberration, push mura, etc. Advantageously, compared with the prior art, only the first common electrode line 131 or the second common electrode line 132 is disposed in the layer where the pixel electrode 22 (corresponding to the plate electrode) is disposed, and is arranged above or below the pixel electrode 22 The liquid crystal display device array substrate can be produced without greatly improving the production line of the existing ADS or IPS mode liquid crystal display device array substrate. The material of the common electrode line may be the same material as the gate line or the same material as the data line. Of course, there are many variations depending on the actual situation. For example, the slit electrode above the insulating layer is a pixel electrode, and the plate electrode under the insulating layer is a common electrode, and the arrangement of the common electrode line is the same as described above.

It should be noted that the embodiments of the present invention can be used in any combination without conflict. In the array substrate of the embodiment, two common electrode lines, a first common electrode line and a second common electrode line, are used to provide two common voltage signals of opposite polarities to the pixel unit, and are loaded into the pixel unit. The driving voltage difference is opposite to the polarity of the common voltage applied to the pixel unit, so that the pixel voltage and the common voltage can be effectively reduced, the DC bias voltage difference can be reduced, and the saving can be achieved when the voltage difference required for the operation of the liquid crystal cell is the same. Power consumption.

According to an embodiment of the present invention, there is further provided a display device comprising any one of the array substrates described above. The display device may be: a product or a component having a display function such as a liquid crystal panel, an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.

The display device provided by the embodiment of the invention can effectively reduce the pixel voltage and the common voltage, reduce the DC bias voltage difference, and achieve the purpose of saving power consumption.

Second embodiment Based on the array substrate of the first embodiment, the embodiment of the present invention provides a method for driving the array substrate. As shown in FIG. 10, the method includes:

Step 101, when displaying one frame of image, sequentially turning on each row of pixel units through the gate line; Step 102, when each row of pixel cells is turned on, driving the opposite driving voltage through the data line and the first common electrode line or the second common electrode line The difference is loaded to the odd column pixel unit and the even column pixel unit, respectively. Wherein, a common voltage applied to the odd-numbered column pixel unit is opposite to a polarity of a common voltage loaded to the even-numbered column pixel unit, and a driving voltage difference applied to any one of the pixel units is opposite to a polarity of a common voltage applied to the pixel unit .

In the method for driving an array substrate according to this embodiment, the common voltage applied to the odd-numbered column pixel unit is opposite to the polarity of the common voltage loaded to the even-numbered column pixel unit, and the driving voltage difference loaded to any of the pixel units is loaded into the The polarity of the common voltage of the pixel unit is always opposite. Therefore, when the voltage difference required for the operation of the liquid crystal cell is the same, the pixel voltage and the common voltage can be effectively reduced, the DC bias voltage difference can be reduced, and power consumption can be saved.

Optionally, the method for driving the array substrate further includes:

Step 103: Every other preset time, the common voltage loaded into the odd column pixel unit and the common voltage loaded into the even column pixel unit are swapped once to make the driving voltage difference loaded into the odd column pixel unit and the even column pixel unit The polarity is exchanged once and the direction of the generated electric field is reversed correspondingly to avoid permanent damage caused by polarization of the liquid crystal material. The preset time is an interval time in which the driving voltage difference and the electric field direction are reversed in the pixel unit. Preferably, the common voltage applied to the odd-numbered column pixel unit and the even-numbered column pixel unit is interchanged once per frame, and the driving voltage difference is Polarity is also exchanged once per frame.

Further, when the dot inversion is specifically implemented, the driving method steps are as follows: Step 11: In a certain frame image display, when a row of pixel units is turned on, the common electrode of the odd-numbered column pixel unit of the row is loaded. The first common voltage VCOMH, the common electrode of the even-numbered column pixel unit of the row is loaded with the second common voltage VCOML, and the polarity of the first common voltage VCOMH is opposite to the polarity of the second common voltage VCOML, and the next row of pixel units is turned on When the common electrode of the odd-numbered column pixel unit is loaded with the second common voltage VCOML, the common electrode of the even-numbered column pixel unit is loaded with the first common voltage VCOMH; Step 12, displaying the next frame picture, loading the common voltage and loading into the odd-numbered column pixel unit The common voltage to the even-numbered column pixel cells is swapped once to swap the polarity of the driving voltage difference applied to the odd-column pixel unit and the even-numbered column pixel unit once. For convenience of explanation, taking a 3-row, 4-column pixel array as an example, assuming that the required operating voltage of the liquid crystal cell is 0 to ±6V, the negative voltage (VCOML) of VCOM1 and VCOM2 is -2¥, and the positive voltage (VCOMH) is +5V. In order to achieve 0~±6V operation with respect to the common voltage, the pixel voltage ranges from -2 to 4V. The driving timing for realizing the dot inversion is as shown in Fig. 11, and the driving timing of the images of three consecutive frames is listed. In the figure, S1 to S4 represent timing signal diagrams on the data line S wide S ₄ , G1 to G3 represent timing signal diagrams on the gate line G wide G ₄ , and VCOM1 and VCOM 2 represent the first common electrode line and the second common electrode line, respectively. Timing signal diagram on. The gray scales are displayed as 0, 1, 2, and 3, respectively. The corresponding cell voltages are 0V, ± 2V, ± 4V, and ± 6V, respectively. The gray scale is shown on the data signal timing diagram of S1~S4 in Figure 11. When VCOM is loaded with a negative voltage of -2V, the pixel voltages are -2V, 0V, 2V, and 4V, respectively; when VCOM is loaded with a positive voltage of +5V, the pixel voltages are 5V, 3V, IV, and -1V, respectively.

Specifically, in the first frame scan, when the first row is scanned, the common electrode VCOM1 of the odd column is loaded with a negative voltage of -2V, and the common electrode VCOM2 of the even column is loaded with a positive voltage of +5V, and for the pixel electrode, the odd column is loaded relative to At the positive voltage of VCOM1, the even column loads the negative voltage relative to VCOM2. Specifically, the common electrode VCOM1 of the first row and the first column are loaded with -2V, and the gray scale is 2, the corresponding driving potential difference is +4V, and the voltage applied to the pixel electrode is +2V. Similarly, the pixel electrode of the first row and the second column is loaded with +3V, the pixel electrode of the third column is loaded with +4V, and the pixel electrode of the fourth column is loaded with +1V, forming an electric field of positive and negative alternating transformation in the same row, as shown in FIG. When scanning the second row, the voltages of the common electrode loading of the odd-numbered column and the even-numbered column pixel unit are interchanged, VCOM1 is loaded with +5V, and VCOM2 is loaded with -2V, thereby driving the remaining row of TFT pixels in a loop to complete the first frame scanning. Then, in the second frame scan, when scanning the first line, the common electrode loads the opposite voltage as the first line of the previous frame, that is, VCOM1 is +5V, VCOM2 is -2V, and when scanning the second line, odd The voltages of the common electrode loading of the column and even column pixel units are interchanged, that is, VCOM1 is -2V, VCOM2 is +5V, and the remaining rows of TFT pixels are scanned in this cycle to complete the second frame scanning. The result is shown in Figure 13. The "+" in the figure indicates that the pixel voltage of the pixel unit is higher than the common voltage, whereas the "-" indicates that the pixel voltage is lower than the common voltage. According to this rule, frame-by-frame scanning can realize dot inversion, that is, the polarity of the driving potential difference of each pixel unit adjacent to the space is opposite, and the driving potential difference of the adjacent two frames of the same pixel unit is opposite in polarity, that is, each frame is reversed. Turn once.

Optionally, as shown in FIG. 14, according to steps 101-103, when the common voltage loaded to any of the pixel units is maintained at a predetermined level during a time when one frame of picture is displayed, the column inverse can be implemented. Turn.

Optionally, the common voltage applied to the first common electrode line or the second common electrode line is an alternating current square wave voltage signal.

In the driving method of the driving array substrate according to the embodiment, when the voltage difference required for the operation of the liquid crystal cell is the same, the pixel voltage and the common voltage can be effectively reduced, and the DC bias voltage difference can be reduced, thereby achieving the purpose of saving power consumption.

According to the embodiment of the present invention, another driving method is further provided, which is applicable to the array substrate of the first embodiment, and the line inversion can be implemented. The method includes:

Step 201: When a frame of a picture is displayed, each row of pixel units is sequentially turned on by the gate line; Step 202, when each row of pixel units is turned on, pass the data line, and the first common electrode line or a second common electrode line, the driving voltage difference is loaded to the pixel unit, and the polarity of the driving voltage difference loaded when any two adjacent rows of the pixel unit are turned on is opposite, and is loaded into any of the pixel units The driving voltage difference is opposite to the polarity of the common voltage applied to the pixel unit; Step 203, when the next frame picture is displayed, the polarity of the common voltage loaded to any adjacent two rows of pixel units is swapped once to enable loading The polarity of the driving voltage difference of any two adjacent rows of pixel units is interchanged once.

Specifically, as shown in FIG. 15, when performing row inversion, when scanning the N-I frame, step 202 includes:

21, when a row of pixel units is turned on, the common electrode of the odd column pixel unit and the common electrode of the even column pixel unit are loaded with a first common voltage; 22, when the next row of pixel units is turned on, The common electrodes of the odd column pixel unit and the even column pixel unit are each loaded with a second common voltage, the polarity of the first common voltage being opposite to the polarity of the second common voltage. When the Nth frame (next frame) picture is displayed, the polarity of the common voltage applied to the pixel unit of any two adjacent rows is changed once. According to this rule, frame-by-frame scanning can achieve line inversion. The method of realizing polarity inversion of the driving array substrate described in the above embodiments is not limited to the above-described manner, and is not described here.

In the driving method of driving the array substrate in the embodiment, when the voltage difference required for the operation of the liquid crystal cell is the same, dot inversion, row inversion, and column inversion can be realized, and the pixel voltage and the common voltage can be effectively reduced. Reduce the DC bias voltage difference to save power consumption.

The embodiment of the present invention can be implemented by using the array substrate provided in the embodiment of the present invention. For the specific function implementation, refer to the description in the method embodiment, and details are not described herein again. According to this issue The array substrate and the driving method thereof provided by the embodiment can be applied to the display field, but are not limited thereto.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general hardware, and of course, can also be implemented by hardware, but in many cases, the former is better. Implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer. A hard disk or optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

The above description is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. It is intended to be covered by the scope of the invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

claims

1. An array substrate, including:

Several pixel units, the pixel units include thin film transistors, pixel electrodes and common electrodes; Several gate lines, wherein each gate line is connected to the gate electrode of the thin film transistor in a row of pixel units;

A plurality of data lines, wherein each data line is connected to a pixel electrode in a column of pixel units through the thin film transistor;

A plurality of first common electrode lines and a plurality of second common electrode lines are connected to the common electrode in the pixel unit, wherein each first common electrode line is connected to an odd-numbered column pixel unit, and each second common electrode The line is connected to the even column pixel unit, and provides a common voltage with opposite polarity to the odd column pixel unit and the even column pixel unit respectively, through the data line and the first common electrode line/the second common The polarity of the driving voltage difference applied to any one of the pixel units by the electrode line is opposite to the polarity of the common voltage applied to the pixel unit.

2. The array substrate according to claim 1, further comprising:

A gate line driving circuit for applying a gate scanning signal to the gate line;

A data line driving circuit for applying data signals to the data lines;

A common electrode line driving circuit is used to apply a common voltage with opposite polarity to the first common electrode line and the second common electrode line.

3. The array substrate according to claim 2, wherein the common electrode line driving circuit includes:

a multiplexer for outputting a preset first common voltage and a preset second common voltage to the first common electrode line and the second common electrode line according to the received polarity control signal, the The polarity of the first common voltage is opposite to the polarity of the second common voltage.

4. The array substrate according to claim 2, wherein the data line driving circuit includes:

a digital-to-analog converter, configured to select one set of gray-scale reference voltages from two sets of gray-scale reference voltages for digital-to-analog conversion according to the input polarity control signal, so that the data line and the first common electrode The polarity of the driving voltage difference applied to any one of the pixel units by line/the second common electrode line remains opposite to the polarity of the common voltage applied to the pixel unit;

The two sets of gray-scale reference voltages are respectively connected with the first common voltage and the second common voltage. Pressure corresponds.

5. The array substrate according to claim 1, wherein the common electrode includes a plurality of connected parts, and the pixel electrode is arranged below the common electrode through an insulating layer.

6. The array substrate according to claim 1, wherein the pixel electrode includes a plurality of connected parts, and the common electrode is disposed below the pixel electrode through an insulating layer.

7. The array substrate according to claim 5 or 6, wherein a via hole is provided in the insulating layer, and the common electrode is connected to the first common electrode through a transparent conductive material provided in the via hole. The first common electrode line or the second common electrode line is arranged on the same layer as the pixel electrode and is located around the pixel electrode.

8. The array substrate according to any one of claims 1 to 6, wherein at the edge of the array substrate, the plurality of first common electrode lines are connected together to form a common voltage first input terminal, and the plurality of first common electrode lines are connected together to form a common voltage first input terminal. The two common electrode lines are connected together to form a second input terminal of the common voltage.

9. A display device, comprising the array substrate according to any one of claims 1-8.

10. A method for driving an array substrate, including the following steps:

When displaying a frame of picture, each row of pixel units is connected in turn through gate lines;

When each row of pixel units is turned on, opposite driving voltage differences are loaded to the odd-numbered column pixel units and the even-numbered column pixel units respectively through the data lines and the first common electrode line or the second common electrode line, wherein, the opposite driving voltage differences are loaded to the odd-numbered columns. The common voltage of the pixel units has an opposite polarity to the common voltage applied to the even-numbered column pixel units, and the driving voltage difference applied to any one of the pixel units has an opposite polarity to the common voltage applied to the pixel unit.

11. The method according to claim 10, further comprising the steps:

Every preset time, the common voltage loaded to the odd column pixel unit and the common voltage loaded to the even column pixel unit are exchanged once, so that the common voltage loaded to the odd column pixel unit and the even column pixel The polarity of the unit's driving voltage difference is reversed once.

12. The method according to claim 10 or 11, wherein when each row of pixel units is turned on, opposite driving voltage differences are respectively loaded to the said pixel units through a data line and a first common electrode line or a second common electrode line. The steps of the odd-numbered column pixel units and the even-numbered column pixel units include: when turning on a certain row of pixel units, the common electrodes of the odd-numbered column pixel units are loaded with a first common voltage, and the common electrodes of the even-numbered column pixel units are loaded with a second common voltage. A common voltage, the polarity of the first common voltage is opposite to the polarity of the second common voltage; When the next row of pixel units is turned on, the common electrode of the odd-numbered column pixel units is loaded with the second common voltage, and the common electrode of the even-numbered column pixel units is loaded with the first common voltage.

13. The method according to claim 10 or 11, wherein during the time of displaying one frame of picture, the common voltage loaded to any of the pixel units is maintained at a predetermined level.

14. The method according to claim 10 or 11, wherein,

The common voltage loaded to the pixel unit through the first common electrode line or the second common electrode line is an AC square wave voltage signal.

15. A method for driving an array substrate, including the following steps:

When displaying a frame of picture, each row of pixel units is sequentially connected through gate lines;

When each row of pixel units is turned on, a driving voltage difference is loaded to the pixel unit through the data line and the first common electrode line or the second common electrode line. The driving voltage applied when the pixel units of any two adjacent rows are turned on. The polarity of the difference is opposite, and the driving voltage difference applied to any one of the pixel units is opposite to the polarity of the common voltage applied to the pixel unit;

When the next frame of picture is displayed, the polarity of the common voltage loaded to any two adjacent rows of pixel units is exchanged once, so that the polarity of the driving voltage difference loaded to any two adjacent rows of pixel units is exchanged once.

16. The method according to claim 15, wherein when the pixel unit is turned on, the step of loading the driving voltage difference to the pixel unit through the data line and the first common electrode line or the second common electrode line includes: conducting When passing through a certain row of pixel units, the common electrodes of the odd-numbered column pixel units and the common electrodes of the even-numbered column pixel units are both loaded with a first common voltage;

When the next row of pixel units is turned on, the common electrodes of the odd-numbered column pixel units and the even-numbered column pixel units are both loaded with a second common voltage, and the polarity of the first common voltage is the same as that of the second common voltage. Opposite polarity.