CN108257576B - Array substrate and driving method thereof, and liquid crystal display device and driving method thereof - Google Patents
Array substrate and driving method thereof, and liquid crystal display device and driving method thereof Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims abstract description 75
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- 210000004027 cell Anatomy 0.000 description 17
- 230000000007 visual effect Effects 0.000 description 11
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- 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
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Abstract
The invention discloses an array substrate and a driving method thereof, a liquid crystal display device and a driving method thereof, wherein the array substrate is provided with a plurality of scanning lines, a plurality of data lines, a plurality of common electrode blocks and a plurality of pixel units, each common electrode block simultaneously covers two adjacent pixel units along the scanning line direction, a pixel electrode is arranged in each pixel unit, two adjacent pixel units in the scanning line direction are arranged in a group on the array substrate in an array way, the pixel electrode in one pixel unit of each group of pixel units is connected with two scanning lines positioned at the upper side and the lower side of the pixel unit and the data lines close to the two switching elements in series through a first switching element and a second switching element which are connected in series, the pixel electrode in another pixel unit is connected with the adjacent scanning line and data line through the third switch element, and each common electrode block is connected with the scanning line and the common line adjacent to the fourth switch element through the fourth switch element.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to an array substrate and a driving method thereof, and a liquid crystal display device and a driving method thereof.
Background
A Liquid Crystal Display (LCD) has advantages of good picture quality, small size, light weight, low driving voltage, low power consumption, no radiation, and relatively low manufacturing cost, and is dominant in the field of flat panel displays.
With the continuous progress of the liquid crystal display technology, the viewing angle of the display has been widened from about 120 ° to over 160 °, and people want to effectively protect business confidentiality and personal privacy while enjoying visual experience brought by a large viewing angle, so as to avoid business loss or embarrassment caused by the leakage of screen information. There is therefore a need for a display device that can be switched to a narrow viewing angle in addition to a wide viewing angle.
Recently, it has been proposed to apply a vertical electric field to liquid crystal molecules by using a viewing angle control electrode on the color filter substrate (CF) side to realize wide and narrow viewing angle switching. Referring to fig. 1 and 2, the lcd device includes an upper substrate 62, a lower substrate 61, and a liquid crystal layer 63 disposed between the upper substrate 62 and the lower substrate 61, wherein a viewing angle control electrode 621 is disposed on the upper substrate 62. As shown in fig. 1, in the wide viewing angle display, the viewing angle control electrode 621 on the upper substrate 62 does not apply a voltage, and the liquid crystal display device realizes the wide viewing angle display. As shown in fig. 2, when a narrow viewing angle display is required, the viewing angle control electrode 621 on the upper substrate 62 applies a voltage, the liquid crystal molecules in the liquid crystal layer 63 will tilt due to the vertical electric field E (as shown by the arrow in fig. 2), and the contrast of the liquid crystal display device is reduced due to light leakage, thereby finally realizing the narrow viewing angle display.
In the narrow viewing angle display, the voltage applied to the viewing angle control electrode is generally an ac voltage. When the liquid crystal display device displays a frame of picture, the liquid crystal display device carries out line-by-line scanning along the direction from top to bottom, because the visual angle control electrode is a plane electrode of the whole surface, when a first line of scanning lines G1 is opened, the visual angle control electrode is already endowed with alternating current voltage, when the following G2-Gn is opened, the voltage of the scanning lines is changed from VGH to VGL, because of the capacitive coupling influence between the scanning lines and the visual angle control electrode, when the next line of scanning lines is opened, the signals on the visual angle control electrode are coupled once, so that the pixels at different positions in the panel are not consistent by the coupling influence of the signals, the picture flicker is caused, obvious bright and dark stripes appear at the jumping point of waveform voltage, and the problem of regional band-shaped display unevenness (band mura) appears at the position of the liquid crystal display device close to the lower end.
In order to solve the problem, the prior art optimizes the driving waveform and the driving voltage of the alternating voltage applied to the viewing angle control electrode to reduce the influence of the display unevenness, but cannot completely eliminate the influence; or, the frame frequency of the liquid crystal display device is increased to 120Hz to reduce the flicker of the picture, but the time for opening each scanning line is halved, which reduces the charging time of the pixel and affects the charging effect of the pixel.
Disclosure of Invention
In order to overcome the disadvantages and shortcomings of the prior art, the present invention provides an array substrate and a driving method thereof, and a liquid crystal display device and a driving method thereof, so as to improve the problem of uneven image display.
The purpose of the invention is realized by the following technical scheme:
the invention provides an array substrate, wherein the array substrate is provided with a plurality of scanning lines, a plurality of data lines and a plurality of pixel electrodes, the array substrate is also provided with a plurality of common lines and common electrodes, the common lines and the data lines extend along the same direction and are arranged alternately, and the scanning lines, the data lines and the common lines are defined in an insulating and crossed way to form a plurality of pixel units; the common electrode comprises a plurality of common electrode blocks which are distributed in an array and are insulated from each other, each common electrode block covers two adjacent pixel units simultaneously along the scanning line direction, the two adjacent pixel units in the scanning line direction are arranged in a group on the array substrate in an array mode, the pixel electrode in one pixel unit of each group of pixel units is connected with the two scanning lines on the upper side and the lower side of the pixel unit and the data lines of the first switching element and the second switching element which are adjacent to and connected in series through the first switching element and the second switching element which are connected in series, the pixel electrode in the other pixel unit is connected with the scanning line and the data line which are adjacent to the third switching element through the third switching element, and each common electrode block is connected with the scanning line and the common line which are adjacent to the fourth switching element through the fourth switching element.
Furthermore, the control end of the first switch element is connected with one of the two scanning lines on the upper side and the lower side of the pixel unit, the control end of the second switch element is connected with the other of the two scanning lines, one conducting end of the first switch element is connected with the data line, one conducting end of the second switch element is connected with the pixel electrode, and the other conducting end of the first switch element is connected with the other conducting end of the second switch element.
Further, the control terminal of the first switching element is connected to the scanning line located on the upper side of the pixel unit, and the control terminal of the second switching element is connected to the scanning line located on the lower side of the pixel unit.
Further, the control terminal of the second switching element is connected to the scanning line located at the lower side of the pixel unit through a connection line.
Further, the control end of the first switching element, the control end of the third switching element and the control end of the fourth switching element are all connected to the same scanning line.
The invention also provides a driving method of the array substrate, which comprises the following steps:
in three adjacent scanning lines Gn, Gn +1 and Gn +2, in a first time period t1, the scanning line Gn and the scanning line Gn +1 are simultaneously made to be at a high level, each pixel unit connected with the first switch element and the second switch element between the scanning line Gn and the scanning line Gn +1 is opened and is charged with a correct data voltage through a plurality of data lines, and each common electrode block between the scanning line Gn and the scanning line Gn +1 is charged with a common voltage through a plurality of common lines;
during a second time period t2, the scanning line Gn is set to a high level, the scanning line Gn +1 is set to a low level, the pixel units connected with the first switching element and the second switching element between the scanning line Gn and the scanning line Gn +1 are closed, the pixel units connected with the third switching element between the scanning line Gn and the scanning line Gn +1 are opened and charged with correct data voltages through a plurality of data lines, and each common electrode block between the scanning line Gn and the scanning line Gn +1 is charged with a common voltage through a plurality of common lines;
during a third time period t3, simultaneously making the scan line Gn +1 and the scan line Gn +2 high, opening the respective pixel units connected to the first and second switching elements between the scan line Gn +1 and the scan line Gn +2 and charging correct data voltages through the plurality of data lines, each common electrode block between the scan line Gn +1 and the scan line Gn +2 being charged with a common voltage through the plurality of common lines;
during a fourth time period t4, the scan line Gn +1 is set to a high level, the scan line Gn +2 is set to a low level, the pixel units connected to the first and second switching elements between the scan line Gn +1 and the scan line Gn +2 are turned off, the pixel units connected to the third switching elements between the scan line Gn +1 and the scan line Gn +2 are turned on and charged with correct data voltages through the plurality of data lines, and each common electrode block between the scan line Gn +1 and the scan line Gn +2 is charged with a common voltage through the plurality of common lines;
wherein n is a positive integer greater than 1.
The invention also provides a liquid crystal display device which comprises the array substrate, a color film substrate arranged opposite to the array substrate and a liquid crystal layer positioned between the array substrate and the color film substrate, wherein the color film substrate is provided with an auxiliary electrode.
The invention also provides a driving method of the liquid crystal display device, which comprises the following steps:
in a first view angle mode, an auxiliary reference voltage is applied to the auxiliary electrode, and a common voltage with a smaller voltage difference relative to the auxiliary reference voltage is applied to each common electrode block through the common line, so that the voltage difference between all the common electrode blocks and the auxiliary electrode is smaller than a preset value;
in a second viewing angle mode, an auxiliary reference voltage is applied to the auxiliary electrode, and a common voltage having a large voltage difference with respect to the auxiliary reference voltage is applied to each common electrode block through the common line such that the voltage difference between all the common electrode blocks and the auxiliary electrode is greater than a preset value.
Further, when a common voltage is applied to each common electrode block through a common line, a first common voltage is applied to the common line positioned at an odd-numbered position in the scanning line direction, and a second common voltage is applied to the common line positioned at an even-numbered position in the scanning line direction, the first and second common voltages are direct current voltages having an amplitude equal to that of the auxiliary reference voltage in a first viewing angle mode, and the first and second common voltages are alternating current voltages having opposite polarities in a second viewing angle mode.
Further, the liquid crystal layer adopts positive liquid crystal molecules, the first visual angle mode is a wide visual angle mode, and the second visual angle mode is a narrow visual angle mode; alternatively, the liquid crystal layer uses negative liquid crystal molecules, and the first viewing angle mode is a narrow viewing angle mode and the second viewing angle mode is a wide viewing angle mode.
The invention has the beneficial effects that: the voltage for controlling the switching of the wide and narrow visual angles is converted from the visual angle control electrode on the side of the color film substrate to the public electrode block on the side of the array substrate, a public line and a switch element are additionally arranged, the pixel electrodes and the public electrode blocks in the pixel units are synchronously charged through the data line and the public line, each charged pixel unit and the pixel unit to be charged are not influenced by voltage coupling, signal coupling can be effectively reduced, the problem of uneven picture display (Mura) caused by the fact that pixels at different positions in a panel are affected by coupling of signals in an inconsistent mode is solved, and display image quality is improved. Therefore, the frame frequency of the liquid crystal display device can be maintained at a low frequency of 60Hz, which is beneficial to reducing power consumption and increasing the charging time and charging effect of pixels.
Drawings
Fig. 1 is a partial cross-sectional view of a conventional liquid crystal display device at a wide viewing angle.
Fig. 2 is a partial cross-sectional view of a conventional liquid crystal display device at a narrow viewing angle.
Fig. 3 is a circuit configuration diagram of a liquid crystal display device in a first embodiment of the present invention.
Fig. 4 is a partial cross-sectional view of a liquid crystal display device at a wide viewing angle in accordance with a first embodiment of the present invention.
Fig. 5 is a partial cross-sectional view of a liquid crystal display device at a narrow viewing angle in accordance with a first embodiment of the present invention.
FIG. 6a is a schematic diagram of driving waveforms of the liquid crystal display device in the first embodiment of the present invention in the Nth frame at a wide viewing angle.
FIG. 6b is a schematic diagram of driving waveforms of the liquid crystal display device in the first embodiment of the present invention for the (N + 1) th frame at a wide viewing angle.
FIG. 7a is a schematic diagram of the driving waveforms of the N-th frame of the LCD device at a narrow viewing angle according to the first embodiment of the present invention.
FIG. 7b is a schematic diagram of driving waveforms of the N +1 th frame of the LCD device at a narrow viewing angle according to the first embodiment of the present invention.
Fig. 8 is a partial cross-sectional view of a liquid crystal display device at a narrow viewing angle in a second embodiment of the present invention.
Fig. 9 is a partial cross-sectional view of a liquid crystal display device at a wide viewing angle in a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, but the scope of the present invention is not limited thereto.
[ first embodiment ]
Referring to fig. 3 and 4, a first embodiment of the invention provides an array substrate, in which a plurality of scan lines 16, a plurality of data lines 17, a plurality of common lines 18 and a common electrode 11 are disposed on an array substrate 10.
The plurality of data lines 17 and the plurality of common lines 18 extend in the same direction, the plurality of data lines 17 and the plurality of common lines 18 are alternately arranged in the direction of the scanning line 16, the plurality of scanning lines 16, the plurality of data lines 17 and the plurality of common lines 18 are mutually insulated and crossed to define a plurality of pixel units P on the array substrate 10, and a pixel electrode 13 is arranged in each pixel unit P.
The common electrode 11 includes a plurality of common electrode blocks 111 distributed in an array and insulated from each other, and each common electrode block 111 covers two adjacent pixel units P simultaneously along the scanning line 16 direction.
Two pixel units P adjacent to each other in the scanning line direction are arranged in an array on the array substrate 10 as a group, the pixel electrode 13 in one of the pixel units P in each group of pixel units P is connected to two scanning lines 16 on the upper and lower sides of the pixel unit P and the data line 17 adjacent to the first and second switching elements 1 and 2 through the first and second switching elements 1 and 2 connected in series, the pixel electrode 13 in the other pixel unit P is connected to the scanning line 16 and the data line 17 adjacent to the third switching element 3 through the third switching element 3, and each common electrode block 111 is connected to the scanning line 16 and the common line 18 adjacent to the fourth switching element 4 through the fourth switching element 4.
Further, the control terminal of the first switching element 1 is connected to one of the two scanning lines 16 located at the upper and lower sides of the pixel unit P, the control terminal of the second switching element 2 is connected to the other scanning line 16 located at the upper and lower sides of the pixel unit P, one of the conductive terminals of the first switching element 1 is connected to the data line 17, one of the conductive terminals of the second switching element 2 is connected to the pixel electrode 13, and the other conductive terminal of the first switching element 1 is connected to the other conductive terminal of the second switching element 2. In the present embodiment, the first switching element 1, the second switching element 2, the third switching element 3, and the fourth switching element 4 are all thin film transistors.
In this embodiment, the control terminal of the first switching element 1 is connected to the scan line 16 located on the upper side of the pixel unit P, the control terminal of the second switching element 2 is connected to the scan line 16 located on the lower side of the pixel unit P through a connection line 5, and the control terminal of the second switching element 2 and the connection line 5 are formed on the same layer. However, the present invention is not limited thereto, and in other embodiments, the control terminal of the first switching element 1 is connected to the scan line 16 located at the lower side of the pixel unit P, the control terminal of the second switching element 2 is connected to the scan line 16 located at the upper side of the pixel unit P, and the control terminal of the second switching element 2 is connected to the scan line 16 located at the lower side of the pixel unit P through one connection line 5.
In the present embodiment, the control terminal of the first switching element 1, the control terminal of the third switching element 3, and the control terminal of the fourth switching element 4 are all connected to the same scan line 16. However, the present invention is not limited thereto, and in other embodiments, the control terminal of the first switching element 1, the control terminal of the third switching element 3, and the control terminal of the fourth switching element 4 may be respectively connected to any one of two scan lines 16 adjacent to the first switching element 1.
The first embodiment of the present invention further provides a driving method of an array substrate, where the driving method includes:
of the three adjacent scan lines Gn, Gn +1, Gn +2, in the first period t1, while making the scan line Gn and the scan line Gn +1 high, each pixel unit P connected to the first switching element 1 and the second switching element 2 between the scan line Gn and the scan line Gn +1 is turned on and charged with a correct data voltage through the plurality of data lines 17, and each common electrode block 111 between the scan line Gn and the scan line Gn +1 is charged with a common voltage through the plurality of common lines 18;
during a second period t2, the scan line Gn is made high, the scan line Gn +1 is made low, the respective pixel units P connected to the first and second switching elements 1 and 2 between the scan line Gn and the scan line Gn +1 are turned off, the respective pixel units P connected to the third switching element 3 between the scan line Gn and the scan line Gn +1 are turned on and charged with correct data voltages through the plurality of data lines 17, and each common electrode block 111 between the scan line Gn and the scan line Gn +1 is charged with a common voltage through the plurality of common lines 18;
during a third period t3, while the scan line Gn +1 and the scan line Gn +2 are made high, the respective pixel cells P connected to the first switching element 1 and the second switching element 2 between the scan line Gn +1 and the scan line Gn +2 are turned on and charged with the correct data voltage through the plurality of data lines 17, and each common electrode block 111 between the scan line Gn +1 and the scan line Gn +2 is charged with the common voltage through the plurality of common lines 18;
during a fourth period t4, the scan line Gn +1 is made high, the scan line Gn +2 is made low, the respective pixel units P connected to the first and second switching elements 1 and 2 between the scan line Gn +1 and the scan line Gn +2 are turned off, the respective pixel units P connected to the third switching element 3 between the scan line Gn +1 and the scan line Gn +2 are turned on and charged with correct data voltages through the plurality of data lines 17, and each common electrode block 111 between the scan line Gn +1 and the scan line Gn +2 is charged with a common voltage through the plurality of common lines 18;
wherein n is a positive integer greater than 1.
The first embodiment of the present invention further provides a liquid crystal display device, as shown in fig. 4, the liquid crystal display device includes the array substrate 10, the color filter substrate 20 disposed opposite to the array substrate 10, and the liquid crystal layer 30 located between the array substrate 10 and the color filter substrate 20.
The color filter substrate 20 has a color resist layer 22, a black matrix BM21, and an auxiliary electrode 24 on the entire surface on the side facing the liquid crystal layer 30. The color resist layer 22 includes, for example, color resist materials of three colors of red, green and blue, and the pixel units P of the three colors of red, green and blue are formed correspondingly. The black matrix 21 is positioned between the pixel units P of three colors of red, green, and blue, so that adjacent pixel units P are spaced apart from each other by the black matrix 21.
In this embodiment, the liquid crystal molecules in the liquid crystal layer 30 are positive liquid crystal molecules, and the positive liquid crystal molecules have the advantage of fast response. As shown in fig. 4, in an initial state (i.e., in a state where no voltage is applied to the liquid crystal display device), the positive liquid crystal molecules in the liquid crystal layer 30 assume a lying posture substantially parallel to the substrates, i.e., the long axis direction of the positive liquid crystal molecules is substantially parallel to the surfaces of the substrates. However, in practical applications, the positive liquid crystal molecules in the liquid crystal layer 30 may have a smaller initial pretilt angle with respect to the substrate, and the initial pretilt angle may be in a range of less than or equal to 10 degrees, that is: 0 DEG ≦ theta ≦ 10 deg.
In this embodiment, the liquid crystal display device can be switched between the wide viewing angle mode and the narrow viewing angle mode by controlling the voltage signals applied to the auxiliary electrode 24 of the color filter substrate 20 and the common electrode 11 of the array substrate 10.
Wide view angle mode: referring to fig. 4, in the present embodiment, in the wide viewing angle mode, the auxiliary reference voltage Vref is applied to the auxiliary electrode 24 of the color filter substrate 20. As shown in fig. 3, 6a and 6B, G1 … G5 represents a plurality of scan lines 16, D1 and D2 represent a first data line 17 and a second data line 17, respectively, a represents a pixel unit at an odd position of a first row, B represents a pixel unit at an even position of a first row, C represents a pixel unit at an odd position of a second row, D represents a pixel unit at an even position of a second row, and t1, t2, t3 and t4 illustrate four stages of charging of the pixels a to D:
t 1: meanwhile, the scanning line G1 and the scanning line G2 are set to be at a high level, the pixel cells a connected to the first switch element 1 and the second switch element 2 between the scanning line G1 and the scanning line G2 are turned on and are charged with correct data voltages through the data lines 17, and each common electrode block 111 between the scanning line G1 and the scanning line G2 is charged with a first common voltage Vcom1 through the common lines 18, so that the voltage difference between each common electrode block 111 and the auxiliary electrode 24 between the scanning line G1 and the scanning line G2 is smaller than a preset value (e.g., smaller than 0.5V);
t 2: making the scanning line G1 high, the scanning line G2 low, the pixel cells a connected to the first switch element 1 and the second switch element 2 between the scanning line G1 and the scanning line G2 are turned off, the pixel cells B connected to the third switch element 3 between the scanning line G1 and the scanning line G2 are turned on and charged with correct data voltages through the data lines 17, and each common electrode block 111 between the scanning line G1 and the scanning line G2 is charged with a first common voltage Vcom1 through the common lines 18, so that the voltage difference between each common electrode block 111 and the auxiliary electrode 24 between the scanning line G1 and the scanning line G2 is less than a preset value;
t 3: meanwhile, the scanning line G2 and the scanning line G3 are set to be at a high level, the pixel cells C connected to the first switch element 1 and the second switch element 2 between the scanning line G2 and the scanning line G3 are turned on and charged with correct data voltages through the data lines 17, and each common electrode block 111 between the scanning line G2 and the scanning line G3 is charged with a second common voltage Vcom2 through the common lines 18, so that the voltage difference between each common electrode block 111 and the auxiliary electrode 24 between the scanning line G2 and the scanning line G3 is smaller than a preset value;
t 4: the scanning line G2 is set to be at a high level, the scanning line G3 is set to be at a low level, the pixel cells C connected with the first switch element 1 and the second switch element 2 between the scanning line G2 and the scanning line G3 are turned off, the pixel cells D connected with the third switch element 3 between the scanning line G2 and the scanning line G3 are turned on and charged with correct data voltages through the data lines 17, and each common electrode block 111 between the scanning line G2 and the scanning line G3 is charged with a second common voltage Vcom2 through the common lines 18, so that the voltage difference between each common electrode block 111 and the auxiliary electrode 24 between the scanning line G2 and the scanning line G3 is smaller than a preset value. At this time, since the voltage difference between all the common electrode blocks 111 and the auxiliary electrodes 24 is small, the tilt angle of the liquid crystal molecules in the liquid crystal layer 30 is hardly changed and is maintained in the lying posture, so that the liquid crystal display device realizes normal wide viewing angle display. Specifically, in the wide viewing angle mode, the first common voltage Vcom1 applied to the odd-numbered column common electrode blocks 111 through the common lines 18 and the second common voltage Vcom2 applied to the even-numbered column common electrode blocks 111 are dc voltages having the same amplitude as the auxiliary reference voltage Vref, the auxiliary reference voltage Vref applied to the auxiliary electrode 24 may be a constant 0V, and the voltage applied to each common line 18 may also be a constant 0V, so that the common voltage applied to each common electrode block 111 is the same as the auxiliary reference voltage Vref, and a good wide viewing angle effect can be achieved.
Narrow view angle mode: referring to fig. 5, in the embodiment, in the narrow viewing angle mode, the auxiliary reference voltage Vref is applied to the auxiliary electrode 24 of the color filter substrate 20, specifically, the auxiliary reference voltage Vref applied to the auxiliary electrode 24 may be a constant 0V. As shown in fig. 3, 7a and 7B, the plurality of scan lines 16 are represented by G1 and G2 … G5, the first data line 17 and the second data line 17 are represented by D1 and D2, respectively, the pixel cell at the odd position of the first row is represented by a, the pixel cell at the even position of the first row is represented by B, the pixel cell at the odd position of the second row is represented by C, the pixel cell at the even position of the second row is represented by D, and the four stages of charging the pixels a to D are illustrated by t1, t2, t3 and t 4:
t 1: meanwhile, the scanning line G1 and the scanning line G2 are set to be at a high level, the pixel cells a connected to the first switch element 1 and the second switch element 2 between the scanning line G1 and the scanning line G2 are turned on and are charged with correct data voltages through the data lines 17, and each common electrode block 111 between the scanning line G1 and the scanning line G2 is charged with a first common voltage Vcom1 through the common lines 18, so that the voltage difference between each common electrode block 111 and the auxiliary electrode 24 between the scanning line G1 and the scanning line G2 is greater than a preset value (e.g., greater than 2V);
t 2: making the scanning line G1 high, the scanning line G2 low, the pixel cells a connected to the first switch element 1 and the second switch element 2 between the scanning line G1 and the scanning line G2 are turned off, the pixel cells B connected to the third switch element 3 between the scanning line G1 and the scanning line G2 are turned on and charged with correct data voltages through the data lines 17, and each common electrode block 111 between the scanning line G1 and the scanning line G2 is charged with a first common voltage Vcom1 through the common lines 18, so that the voltage difference between each common electrode block 111 and the auxiliary electrode 24 between the scanning line G2 and the scanning line G2 is greater than a preset value;
t 3: meanwhile, the scanning line G2 and the scanning line G3 are set to be at a high level, the pixel cells C connected to the first switch element 1 and the second switch element 2 between the scanning line G2 and the scanning line G3 are turned on and charged with correct data voltages through the data lines 17, and each common electrode block 111 between the scanning line G2 and the scanning line G3 is charged with a second common voltage Vcom2 through the common lines 18, so that the voltage difference between each common electrode block 111 and the auxiliary electrode 24 between the scanning line G2 and the scanning line G3 is greater than a preset value;
t 4: the scanning line G2 is set to be at a high level, the scanning line G3 is set to be at a low level, the pixel cells C connected with the first switch element 1 and the second switch element 2 between the scanning line G2 and the scanning line G3 are turned off, the pixel cells D connected with the third switch element 3 between the scanning line G2 and the scanning line G3 are turned on and charged with correct data voltages through the data lines 17, and each common electrode block 111 between the scanning line G2 and the scanning line G3 is charged with a second common voltage Vcom2 through the common lines 18, so that the voltage difference between each common electrode block 111 and the auxiliary electrode 24 between the scanning line G2 and the scanning line G3 is greater than a preset value.
Because the voltage difference between all the common electrode blocks 111 and the auxiliary electrodes 24 is large, a strong vertical electric field E (as shown by an arrow in fig. 5) is generated between the array substrate 10 and the color film substrate 20 in the liquid crystal cell, and the positive liquid crystal molecules rotate in a direction parallel to the electric field lines under the action of the electric field, so that the positive liquid crystal molecules deflect under the action of the vertical electric field E, the inclination angle between the liquid crystal molecules and the substrate is increased and tilted, the liquid crystal molecules are changed from a lying posture to an inclined posture, the liquid crystal display device has large-angle observation light leakage, the contrast is reduced in the oblique direction, the viewing angle is narrowed, and the liquid crystal display device finally realizes narrow-viewing-angle display. Specifically, in the narrow viewing angle mode, the first common voltage Vcom1 applied to the odd-numbered column common electrode blocks 111 through the common line 18 and the second common voltage Vcom2 applied to the even-numbered column common electrode blocks 111 are both ac voltages and have opposite polarities, and the polarities of the first common voltage Vcom1 and the second common voltage Vcom2 are inverted once per frame, the two-dot inversion driving of the liquid crystal display device can be realized.
In this embodiment, the switching of the wide and narrow viewing angles is realized by controlling the voltage of the common electrode block 111 on the side of the array substrate 10, and the common line 18 and the switching element are additionally added, the pixel electrode 13 and the common electrode block 111 in the pixel unit P are synchronously charged through the data line 17 and the common line 18, and each charged pixel unit P and the pixel unit P to be charged are not affected by voltage coupling, so that signal coupling can be effectively reduced, the problem of uneven picture display (Mura) caused by the fact that pixels at different positions in the panel are affected by signal coupling in an inconsistent manner is solved, and the display image quality is improved. Therefore, the frame frequency of the liquid crystal display device can be maintained at a low frequency of 60Hz, which is beneficial to reducing power consumption and increasing the charging time and charging effect of the pixels.
[ second embodiment ]
Referring to fig. 8 and 9, a liquid crystal display device according to a second embodiment of the present invention is different from the first embodiment in that a liquid crystal layer 30 in the present embodiment uses negative liquid crystal molecules. With the technical progress, the performance of the negative liquid crystal is remarkably improved, and the application is more and more extensive. In the present embodiment, as shown in fig. 8, in the initial state (i.e., in the case where no voltage is applied to the liquid crystal display device), the negative liquid crystal molecules in the liquid crystal layer 30 have a large initial pretilt angle with respect to the substrates, i.e., the negative liquid crystal molecules are in an inclined posture with respect to the substrates in the initial state.
Narrow view angle mode: referring to fig. 8, in the embodiment, in the narrow viewing angle mode, an auxiliary reference voltage Vref is applied to the auxiliary electrode 24 of the color filter substrate 20, and a common voltage having a smaller voltage difference with respect to the auxiliary reference voltage Vref is applied to each common electrode block 111 on the array substrate 10 through the common line 18, so that the voltage difference between all the common electrode blocks 111 and the auxiliary electrode 24 is smaller than a preset value (e.g., smaller than 0.5V). At this time, since the voltage difference between all the common electrode blocks 111 and the auxiliary electrodes 24 is small, the tilt angle of the liquid crystal molecules in the liquid crystal layer 30 is almost unchanged and still kept in a tilt posture, so that the liquid crystal display device has large-angle viewing light leakage, the contrast ratio is reduced in the oblique viewing direction and the viewing angle is narrowed, and at this time, the liquid crystal display device realizes narrow viewing angle display.
Specifically, in the narrow viewing angle mode, the auxiliary reference voltage Vref applied by the auxiliary electrode 24 may be a constant 0V, and the voltage applied to each common line 18 may also be a constant 0V, so that the voltage difference between each common electrode block 111 and the auxiliary electrode 24 is zero, and a good narrow viewing angle effect may be achieved.
Wide view angle mode: referring to fig. 9, in the embodiment, in the narrow viewing angle mode, an auxiliary reference voltage Vref is applied to the auxiliary electrode 24 of the color filter substrate 20, and a common voltage having a larger voltage difference with respect to the auxiliary reference voltage Vref is applied to each common electrode block 111 on the array substrate 10 through the common line 18, so that the voltage difference between all the common electrode blocks 111 and the auxiliary electrode 24 is greater than a preset value (for example, greater than 2V). At this time, since the voltage difference between all the common electrode blocks 111 and the auxiliary electrodes 24 is large, a strong vertical electric field E (as shown by an arrow in fig. 9) is generated between the array substrate 10 and the color film substrate 20 in the liquid crystal cell, and since the negative liquid crystal molecules are deflected in a direction perpendicular to the electric field lines under the action of the electric field, the negative liquid crystal molecules are deflected under the action of the vertical electric field E, so that the tilt angle between the liquid crystal molecules and the substrate is reduced, the phenomenon of light leakage at a large angle of the liquid crystal display device is correspondingly reduced, the contrast is improved in the oblique viewing direction, the viewing angle is increased, and the liquid crystal display device finally realizes wide viewing angle display.
For the rest of the structure and the operation principle of this embodiment, reference may be made to the first embodiment, which is not described herein again.
The above embodiments are only examples of the present invention and are not intended to limit the scope of the present invention, and all equivalent changes and modifications made according to the contents described in the claims of the present invention should be included in the claims of the present invention.
Claims (9)
1. A driving method for driving an array substrate is provided, wherein a plurality of scanning lines (16), a plurality of data lines (17) and a plurality of pixel electrodes (13) are arranged on the array substrate (10), the driving method is characterized in that a plurality of common lines (18) and common electrodes (11) are further arranged on the array substrate (10), the plurality of common lines (18) and the plurality of data lines (17) extend along the same direction and are alternately arranged with each other, and the plurality of scanning lines (16), the plurality of data lines (17) and the plurality of common lines (18) are insulated and crossed to define a plurality of pixel units (P); the common electrode (11) comprises a plurality of common electrode blocks (111) which are distributed in an array and are insulated from each other, each common electrode block (111) covers two adjacent pixel units (P) simultaneously along the direction of a scanning line (16), two adjacent pixel units (P) in the direction of the scanning line are arranged on the array substrate (10) in an array mode, a pixel electrode (13) in one pixel unit (P) in each group of pixel units (P) is connected with two scanning lines (16) on the upper side and the lower side of the pixel unit (P) and a data line (17) adjacent to the first switching element (1) and the second switching element (2) in series through a first switching element (1) and a second switching element (2) in series, and a pixel electrode (13) in the other pixel unit (P) is connected with the scanning line (16) and the data line (17) adjacent to the third switching element (3) through the third switching element (3), each common electrode block (111) is connected to a scanning line (16) and a common line (18) adjacent to the fourth switching element (4) through the fourth switching element (4);
the driving method includes:
in three adjacent scanning lines Gn, Gn +1 and Gn +2, in a first time period t1, the scanning line Gn and the scanning line Gn +1 are simultaneously made to be in a high level, each pixel unit (P) connected with the first switching element (1) and the second switching element (2) between the scanning line Gn and the scanning line Gn +1 is opened and is charged with a correct data voltage through the plurality of data lines (17), and each common electrode block (111) between the scanning line Gn and the scanning line Gn +1 is charged with a common voltage through the plurality of common lines (18);
during a second period t2, the scan line Gn is made high, the scan line Gn +1 is made low, the respective pixel cells (P) connected to the first switching element (1) and the second switching element (2) between the scan line Gn and the scan line Gn +1 are turned off, the respective pixel cells (P) connected to the third switching element (3) between the scan line Gn and the scan line Gn +1 are turned on and charged with correct data voltages through the plurality of data lines (17), and each common electrode block (111) between the scan line Gn and the scan line Gn +1 is charged with a common voltage through the plurality of common lines (18);
during a third time period t3, while making the scan line Gn +1 and the scan line Gn +2 high, the respective pixel cells (P) connected to the first switching element (1) and the second switching element (2) between the scan line Gn +1 and the scan line Gn +2 are turned on and charged with correct data voltages through the plurality of data lines (17), and each common electrode block (111) between the scan line Gn +1 and the scan line Gn +2 is charged with a common voltage through the plurality of common lines (18);
during a fourth time period t4, the scan line Gn +1 is set to a high level, the scan line Gn +2 is set to a low level, the pixel cells (P) connected to the first switching element (1) and the second switching element (2) between the scan line Gn +1 and the scan line Gn +2 are turned off, the pixel cells (P) connected to the third switching element (3) between the scan line Gn +1 and the scan line Gn +2 are turned on and charged with correct data voltages through the plurality of data lines (17), and each common electrode block (111) between the scan line Gn +1 and the scan line Gn +2 is charged with a common voltage through the plurality of common lines (18);
wherein n is a positive integer greater than 1.
2. The driving method for driving the array substrate according to claim 1, wherein a control terminal of the first switching element (1) is connected to one of the two scan lines (16) located at upper and lower sides of the pixel unit (P), a control terminal of the second switching element (2) is connected to the other of the two scan lines (16), one conductive terminal of the first switching element (1) is connected to the data line (17), one conductive terminal of the second switching element (2) is connected to the pixel electrode (13), and the other conductive terminal of the first switching element (1) is connected to the other conductive terminal of the second switching element (2).
3. The driving method for driving the array substrate according to claim 2, wherein the control terminal of the first switching element (1) is connected to the scan line (16) located at the upper side of the pixel unit (P), and the control terminal of the second switching element (2) is connected to the scan line (16) located at the lower side of the pixel unit (P).
4. The driving method for driving the array substrate according to claim 3, wherein the control terminal of the second switching element (2) is connected to the scan line (16) at the lower side of the pixel unit (P) through a connection line (5).
5. The driving method for driving the array substrate according to claim 3, wherein the control terminal of the first switching element (1), the control terminal of the third switching element (3) and the control terminal of the fourth switching element (4) are all connected to the same scan line (16).
6. A liquid crystal display device, comprising an array substrate (10), a color filter substrate (20) disposed opposite to the array substrate (10), and a liquid crystal layer (30) disposed between the array substrate (10) and the color filter substrate (20), wherein an auxiliary electrode (24) is disposed on the color filter substrate (20), and the array substrate (10) is driven by the driving method for driving the array substrate according to any one of claims 1 to 5.
7. A driving method for driving the liquid crystal display device according to claim 6, characterized in that the driving method comprises:
in a first view angle mode, an auxiliary reference voltage (Vref) is applied to the auxiliary electrode (24), a common voltage having a small voltage difference with respect to the auxiliary reference voltage (Vref) is applied to each common electrode block (111) through the common line (18), and the voltage difference between all the common electrode blocks (111) and the auxiliary electrode (24) is less than a preset value;
in a second view angle mode, an auxiliary reference voltage (Vref) is applied to the auxiliary electrode (24), and a common voltage having a large voltage difference with respect to the auxiliary reference voltage (Vref) is applied to each common electrode block (111) through the common line (18), so that the voltage difference between all the common electrode blocks (111) and the auxiliary electrode (24) is greater than a preset value.
8. The driving method according to claim 7, wherein when the common voltage is applied to each common electrode block (111) through the common lines (18), a first common voltage (Vcom1) is applied to the common lines (18) located at odd-numbered positions in the direction of the scanning lines (16), a second common voltage (Vcom2) is applied to the common lines (18) located at even-numbered positions in the direction of the scanning lines (16), the first common voltage (Vcom1) and the second common voltage (Vcom2) are direct current voltages having the same amplitude as the auxiliary reference voltage (Vref) in the first viewing angle mode, and the first common voltage (Vcom1) and the second common voltage (Vcom2) are alternating current voltages having opposite polarities in the second viewing angle mode.
9. The driving method according to claim 7, wherein the liquid crystal layer (30) employs positive liquid crystal molecules, the first viewing angle mode is a wide viewing angle mode, and the second viewing angle mode is a narrow viewing angle mode; alternatively, the liquid crystal layer (30) uses negative liquid crystal molecules, and the first viewing angle mode is a narrow viewing angle mode and the second viewing angle mode is a wide viewing angle mode.
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| CN108873415B (en) * | 2018-07-27 | 2021-03-23 | 昆山龙腾光电股份有限公司 | Liquid crystal display device and driving method |
| CN109188816B (en) * | 2018-10-26 | 2021-06-22 | 昆山龙腾光电股份有限公司 | Array substrate and driving method thereof, and liquid crystal display device and driving method thereof |
| WO2020093216A1 (en) * | 2018-11-05 | 2020-05-14 | 昆山龙腾光电股份有限公司 | Driving method for liquid crystal display device |
| CN109859705A (en) | 2019-01-30 | 2019-06-07 | 惠科股份有限公司 | A kind of driving method, display panel and drive module |
| CN109917570B (en) * | 2019-04-16 | 2022-05-20 | 昆山龙腾光电股份有限公司 | Array substrate and manufacturing method thereof, liquid crystal display device and driving method |
| CN115308954A (en) * | 2022-10-12 | 2022-11-08 | 广州华星光电半导体显示技术有限公司 | Array substrate, liquid crystal display panel and display device |
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| KR101219318B1 (en) * | 2005-12-29 | 2013-01-08 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| KR101368234B1 (en) * | 2007-11-21 | 2014-02-28 | 엘지디스플레이 주식회사 | Array substrate for liquid crystal display device and method of fabricating the same |
| CN107193164B (en) * | 2017-07-03 | 2020-06-05 | 昆山龙腾光电股份有限公司 | Array substrate, liquid crystal display device and driving method |
| TWI616861B (en) * | 2017-07-21 | 2018-03-01 | 友達光電股份有限公司 | Active matrix liquid crystal display device |
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| CN107861278B (en) * | 2017-12-26 | 2020-01-03 | 昆山龙腾光电股份有限公司 | Liquid crystal display device having a plurality of pixel electrodes |
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