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KR20160145383A - High Transmittance and Fast Response Liquid Crystal Display - Google Patents

High Transmittance and Fast Response Liquid Crystal Display Download PDF

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Publication number
KR20160145383A
KR20160145383A KR1020150081929A KR20150081929A KR20160145383A KR 20160145383 A KR20160145383 A KR 20160145383A KR 1020150081929 A KR1020150081929 A KR 1020150081929A KR 20150081929 A KR20150081929 A KR 20150081929A KR 20160145383 A KR20160145383 A KR 20160145383A
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South Korea
Prior art keywords
liquid crystal
electrode
substrate
crystal display
display device
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KR1020150081929A
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Korean (ko)
Inventor
윤태훈
허준
최태훈
허재원
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부산대학교 산학협력단
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Priority to KR1020150081929A priority Critical patent/KR20160145383A/en
Publication of KR20160145383A publication Critical patent/KR20160145383A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F2001/134372—

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Liquid Crystal (AREA)

Abstract

The first electrode formed on the first substrate and the second electrode formed on the second substrate have a parallel structure in which the positions of the electrodes are different from each other and an electric field in a diagonal direction is formed to form a high- A first substrate and a second substrate facing each other; A first electrode formed on the first substrate; A second electrode formed on the second substrate; And a liquid crystal layer composed of a plurality of liquid crystal molecules injected between the first substrate and the second substrate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display (LCD)

More specifically, the present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a first electrode formed on a first substrate and a second electrode formed on a second substrate and forming an electric field in a diagonal direction, To a liquid crystal display device.

The liquid crystal display device includes a lower substrate, an upper substrate, and a liquid crystal layer formed between the both substrates, and the arrangement of the liquid crystal layers is controlled according to whether an electric field is applied or not, thereby controlling the transmittance of light to display an image .

Such a liquid crystal display device may be variously used in a twisted nematic (TN) mode, a VA (Vertical Alignment) mode, an IPS (In Plane Switching) mode or an FFS (Fringe Field Switching) mode depending on a method of controlling the arrangement of liquid crystal layers Has been developed.

In the IPS mode and the FFS mode, a pixel electrode and a common electrode are disposed together on a lower substrate, and the arrangement of the liquid crystal layer is controlled by an electric field between the pixel electrode and the common electrode.

In the IPS mode, the pixel electrodes and the common electrode are alternately arranged in parallel to each other to generate a horizontal electric field between the two electrodes to control the alignment of the liquid crystal layer. In the FFS mode, One electrode is formed in a plate shape and the other electrode is formed in a finger shape so that the alignment of the liquid crystal layer is formed through a fringe field generated between the two electrodes Control.

1 is a configuration diagram of a conventional liquid crystal display device.

Here, the FFS (Fringe Field Switching) mode liquid crystal display device is intended to increase the transmittance and realize a wide viewing angle.

In the FFS mode, a pixel electrode and a common electrode are formed on different layers on one substrate, and liquid crystal molecules are rotated by using an electric field in a horizontal direction and a vertical direction.

However, the FFS mode has a disadvantage in that the response speed is slow, and has a higher transmittance than the IPS mode, but has a lower transmittance than the TN mode or the VA mode. Further, as the performance of the liquid crystal display device has improved, demands for a faster response speed and a higher transmittance have been increasing.

In accordance with this demand, Korean Unexamined Patent Publication No. 10-2008-0049304 proposes a liquid crystal display device having a liquid crystal in which the positions of the electrodes of the upper and lower plates are different from each other and are arranged in parallel with the initial substrate. However, The purpose of switching between wide viewing angles is limited in improvement of high transmittance.

In particular, the driving voltage is high by using both the electric field in the oblique direction and the electric field in the horizontal direction, and the actual driving is limited by the positive liquid crystal.

Korean Patent Publication No. 10-2008-0049304 Korean Patent Publication No. 10-2013-0056875

A liquid crystal display device having a first electrode on a first substrate and a second electrode on a second substrate and having a high transmission characteristic and a high speed response characteristic, The purpose is to provide.

The present invention provides a liquid crystal display device having a first electrode formed on a first substrate and a second electrode formed on a second substrate, and forming an electric field in a diagonal direction to have a high transmissivity and a high-speed response characteristic, There is a purpose.

An object of the present invention is to provide a liquid crystal display device in which a common voltage and a data voltage are applied to a first electrode and a second electrode to form an electric field in an oblique direction, thereby achieving high throughput characteristics and high speed response characteristics.

It is an object of the present invention to provide a liquid crystal display device having a high transmissivity and a high response characteristic in which the first electrode and the second electrode have a parallel structure with different electrode positions and have a constant width and interval.

The liquid crystal molecules have negative dielectric anisotropy and the liquid crystal molecules adjacent to the first substrate of the liquid crystal layer are arranged in parallel to the surface of the first substrate and the liquid crystal molecules adjacent to the second substrate of the liquid crystal layer are aligned with the second substrate And to provide a liquid crystal display device having high throughput characteristics and high-speed response characteristics that can be arranged in parallel with the surface of a liquid crystal display device.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a liquid crystal display device including a first substrate and a second substrate facing each other, a first electrode formed on the first substrate, And a liquid crystal layer composed of a plurality of liquid crystal molecules injected between the first substrate and the second substrate, wherein a common voltage is applied to the first electrode, and a data voltage is applied to the second electrode Thereby forming an electric field in a diagonal direction.

Here, the first electrode and the second electrode are a plurality of branched electrodes extending in a predetermined direction.

The width and the interval of the first electrode and the second electrode, each having a predetermined width and spaced apart from each other by a predetermined distance, do not exceed 10 μm.

The first electrode and the second electrode are parallel to each other without overlapping the electrode positions.

And liquid crystal molecules adjacent to the first substrate are arranged in parallel to the surface of the first substrate when the electric field is not applied to the liquid crystal layer, And the molecules are arranged in parallel with the surface of the second substrate.

And a second polarizer attached to the outside of the second substrate, wherein when an electric field is not applied to the liquid crystal layer, the surface of the first substrate And the long axis of the liquid crystal molecules arranged in parallel with the absorption axis of the first polarizing plate or the second polarizing plate is arranged in parallel with the absorption axis of the first polarizing plate or the second polarizing plate.

And the direction of the long axis of the liquid crystal molecules arranged in parallel with the surface of the first substrate is 0 to 90 degrees with respect to the first electrode and the second electrode.

And the liquid crystal display device displays black when no electric field is applied.

In the ON state of the liquid crystal display device, the first voltage and the second voltage are respectively applied to the first electrode and the second electrode, and the first voltage and the second voltage having different sizes are applied to the first electrode and the second electrode, When applied to the two electrodes, a diagonal electric field is applied to the liquid crystal layer, whereby the liquid crystal molecules rotate in different directions.

And the liquid crystal molecule has a negative dielectric anisotropy so that the major axis direction of the liquid crystal molecules rotates in a direction perpendicular to the oblique electric field direction applied to the liquid crystal layer.

The liquid crystal display device having the high transmissivity characteristic and the high-speed response characteristic according to the present invention has the following effects.

First, a liquid crystal display device having high transmission characteristics can be realized.

Second, the thickness of the liquid crystal layer having the maximum transmittance can be reduced by providing a first electrode and a second electrode having parallel structures with different electrode positions and forming an electric field in a diagonal direction.

Third, a liquid crystal display device having a high-speed response characteristic can be realized due to the thickness of the thinned liquid crystal layer.

Fourth, only the electric field in the oblique direction can be structurally stable and the negative liquid crystal can be used in actual driving with a low voltage.

1 is a block diagram of a conventional liquid crystal display
2 is a diagram illustrating a configuration of a liquid crystal display device according to an embodiment of the present invention
3 and 4 are diagrams for explaining a driving method of the liquid crystal display device
5 and 6 are diagrams showing the distribution of equipotential lines and transmissivity in each region of the liquid crystal display device
7 is a graph showing the response time between black and white of the liquid crystal display device

Hereinafter, a preferred embodiment of a liquid crystal display device having high throughput characteristics and high-speed response characteristics according to the present invention will be described in detail as follows.

The features and advantages of the liquid crystal display device having the high-transmittance characteristic and the high-speed response characteristic according to the present invention will be apparent from the following detailed description of each embodiment.

FIG. 2 is a configuration diagram of a liquid crystal display device according to an embodiment of the present invention, and FIGS. 3 and 4 are diagrams for illustrating a driving method of a liquid crystal display device.

A liquid crystal display device having a high throughput characteristic and a high-speed response characteristic according to the present invention includes a first electrode formed on a first substrate and a second electrode formed on a second substrate, forming an electric field in a diagonal direction, Speed response characteristic.

In the present invention, a common voltage and a data voltage are applied to the first electrode and the second electrode to form an electric field in an oblique direction, thereby achieving high throughput characteristics and high-speed response characteristics.

The present invention includes the following structural features in order to obtain a high transmission characteristic and a high transmission characteristic.

A liquid crystal display device according to the present invention includes a first substrate and a second substrate facing each other, a first electrode formed on the first substrate, and a second electrode formed on the second substrate, And a liquid crystal layer including a plurality of liquid crystal molecules between one substrate and the second substrate.

Here, the first electrode and the second electrode have a constant width and an interval, and have a parallel structure in which the positions of the electrodes are different from each other.

Here, the first electrode and the second electrode have a plurality of branched electrodes extending in a predetermined direction.

Wherein the liquid crystal molecules have a negative dielectric anisotropy and the liquid crystal molecules adjacent to the first substrate of the liquid crystal layer are arranged in parallel to the surface of the first substrate and the liquid crystal molecules adjacent to the second substrate of the liquid crystal layer 2 < / RTI > substrate.

The liquid crystal display may further include a first polarizing plate disposed adjacent to the first substrate and having a first absorption axis and a second polarizing plate disposed adjacent to the second substrate and having a second absorption axis.

Wherein the liquid crystal display device has a rubbing direction the same as that of the first and second absorption axes, the liquid crystal display device displays black in a state in which no electric field is applied, May be between 0 and 90 degrees.

A common voltage and a data voltage may be applied to the first electrode and the second electrode to form an electric field in an oblique direction.

Specifically, the structure of a liquid crystal display device having high throughput characteristics and high-speed response characteristics according to the present invention will now be described.

2, a liquid crystal display according to an exemplary embodiment of the present invention includes a first substrate 100 and a second substrate 200 facing each other, and a second substrate 200 facing the first substrate 100 and the second substrate 200 And a liquid crystal layer (3) located in the liquid crystal layer.

Here, the first substrate 100 includes a first electrode 190 formed on a first base substrate 110.

The first electrode 190 has a constant width and a constant gap.

Here, the second substrate 200 includes a second electrode 290 formed on the second base substrate 210.

The second electrode 290 has a constant width and a predetermined gap.

The first electrode 190 and the second electrode 290 are a plurality of branched electrodes extending in a predetermined direction.

The first electrode 190 and the second electrode 290 have a parallel structure with different electrode positions.

It is preferable that the first electrode 190 and the second electrode 290 have a width and an interval not exceeding 10 탆.

Though not shown, a thin film transistor connected to a signal line such as a gate line, a data line, and a signal line may be formed on the first base substrate 110. In addition, the first electrode 190 may be connected to the output terminal of another thin film transistor.

Although not shown, a color filter is formed on the first substrate 100 or the second substrate 200.

Each color filter can display one of three primary colors of red, green, and blue, or primary colors such as yellow, cyan, magenta, and the like. In addition, each pixel can display a mixed color or a white color of the basic color in addition to the basic color.

The first polarizer 11 is located outside the first substrate 100 and the second polarizer 22 is located outside the second substrate 200.

The absorption axes of the first polarizing plate 11 and the second polarizing plate 22 may be orthogonal to each other.

The liquid crystal layer 3 includes a plurality of liquid crystal molecules 31. A plurality of liquid crystal molecules 31 adjacent to the first substrate 100 are arranged in parallel with the first substrate 100, A plurality of liquid crystal molecules 31 adjacent to the first substrate 200 are arranged in parallel with the second substrate 200 and the liquid crystal molecules 31 are aligned in a predetermined direction in an initial orientation .

The liquid crystal molecule 31 may have a negative dielectric anisotropy and the initial alignment direction may be parallel to the absorption axis of either the first polarizing plate 11 or the second polarizing plate 22, The absorption axis of the other one of the first polarizing plate 11 and the second polarizing plate 22 is vertical and black is displayed without applying an electric field.

FIGS. 3 and 4 are for explaining the driving method of the liquid crystal display of FIG.

3 shows an OFF state in which no electric field is applied.

Referring to FIG. 3, the liquid crystal molecules 31 adjacent to the first substrate 100 are oriented at a certain angle? With the first and second electrodes.

As described above, the direction in which the liquid crystal molecules 31 are initially oriented can be aligned with the polarization axis of any one of the first polarizing plate 11 and the second polarizing plate 22, and the first polarizing plate 11 and the second polarizing plate 22 The polarization axis of the other of the first and second light sources 22 may be orthogonal.

Therefore, the light incident on the first substrate 100 is not transmitted through the first polarizing plate 11, the liquid crystal layer 3, and the second polarizing plate 22, thus displaying a black state.

Next, the ON state of the liquid crystal display will be described with reference to FIG.

In the ON state of the liquid crystal display device, the first voltage and the second voltage are applied to the first electrode 190 and the second electrode 290, respectively.

The magnitudes of the first voltage and the second voltage may be the same or different from each other.

For example, the first voltage may be a common voltage and the second voltage may be a data voltage.

Referring to FIG. 4, when a first voltage and a second voltage having different sizes are applied to the first electrode 190 and the second electrode 290, an oblique electric field is applied to the liquid crystal layer, The molecule 31 rotates in the other direction 31a.

The long axis direction of the liquid crystal molecules 31 is rotated in a direction orthogonal to the electric field direction in the diagonal direction applied to the liquid crystal layer 3 because the liquid crystal molecules 31 have a negative dielectric anisotropy.

As the liquid crystal molecules 31 rotate, light incident on the first substrate 100 passes through the first polarizing plate 11, the liquid crystal layer 3, and the second polarizing plate 22 and displays a certain brightness do.

Table 1 is a table showing the thicknesses of the liquid crystal layers in which the maximum transmittance and the maximum transmittance of the liquid crystal display of the related art (Fig. 5) and the liquid crystal display of the present invention (Fig. 6) are shown.

Figure pat00001

1, the first electrode 170 and the second electrode 190 overlapping the first substrate 100 with the insulating film 80 sandwiched therebetween, 2, a first electrode 190 formed on a first substrate 100 and a second electrode 190 formed on a second substrate (not shown) are formed on the first substrate 100, 290) are formed, the distribution of the equipotential lines and the transmittance in each region are shown in FIGS. 5 and 6. FIG.

5 and 6, in the liquid crystal display of the related art, the intensity of the electric field is strongest at the edge of the electrode and weak at the top of the electrode and between the electrodes, whereas the present invention is characterized in that the intensity of the electric field is almost constant in all regions Accordingly, the present invention can achieve a maximum transmittance in all areas, and thus has a higher transmittance than a conventional liquid crystal display device.

In the conventional liquid crystal display device, the electric field intensity is weak at the upper part of the liquid crystal layer, whereas at the upper part of the liquid crystal layer in the present invention, an electric field of strong intensity is formed as in the lower part, The liquid crystal display device according to the present invention has a faster response characteristic than the conventional liquid crystal display device due to the thickness of the liquid crystal layer that is smaller than that of the conventional liquid crystal display device.

Referring to Table 1, FIG. 5, and FIG. 6, the liquid crystal display device according to the embodiment of the present invention has a high transmittance and a small thickness of the liquid crystal layer as compared with the conventional liquid crystal display device.

7 is a graph showing another calculated result of the present invention, and Table 2 is a table showing a result of response time according to the calculated result.

Figure pat00002

As a result of the calculation, compared with the case of forming the first electrode 170 and the second electrode 190 overlapping the first substrate 100 with the insulating film 80 interposed therebetween, as in the liquid crystal display device of the related art, When the first electrode 190 and the second electrode 290 are formed on the first substrate 100 and the second substrate 290 as in the liquid crystal display device according to the embodiment of the present invention, The results are shown in Fig.

The black solid line in FIG. 7 shows the results of the conventional liquid crystal display, and the red solid line shows the result of the liquid crystal display according to the embodiment of the present invention.

Referring to Table 2 and FIG. 7, the response time of the liquid crystal display device according to the embodiment of the present invention is shorter than that of the conventional liquid crystal display device.

According to the liquid crystal display device of the present invention, the first electrode formed on the first substrate and the second electrode formed on the second substrate have a parallel structure with different electrode positions So as to have a high-throughput characteristic and a high-speed response characteristic.

Particularly, by applying a common voltage and a data voltage to the first electrode and the second electrode to form an electric field in a diagonal direction, the electric field intensity is constant in all regions, and the thickness of the liquid crystal layer is made small, So that the characteristics can be obtained.

As described above, it will be understood that the present invention is implemented in a modified form without departing from the essential characteristics of the present invention.

It is therefore to be understood that the specified embodiments are to be considered in an illustrative rather than a restrictive sense and that the scope of the invention is indicated by the appended claims rather than by the foregoing description and that all such differences falling within the scope of equivalents thereof are intended to be embraced therein It should be interpreted.

3. Liquid crystal layer 100. First substrate
190. First electrode 200. Second substrate
290. Second electrode

Claims (10)

A first substrate and a second substrate facing each other;
A first electrode formed on the first substrate;
A second electrode formed on the second substrate;
And a liquid crystal layer composed of a plurality of liquid crystal molecules injected between the first substrate and the second substrate,
Wherein a common voltage is applied to the first electrode and a data voltage is applied to the second electrode to form an electric field in an oblique direction. The liquid crystal display of claim 1, wherein the first electrode and the second electrode are a plurality of branched electrodes extending in parallel in a predetermined direction. The liquid crystal display device according to claim 2, wherein widths and intervals of the first electrode and the second electrode, each having a predetermined width and spaced apart from each other by a predetermined distance, do not exceed 10 占 퐉. . The liquid crystal display of claim 1, wherein the first electrode and the second electrode have a parallel structure without overlapping the electrode positions. The liquid crystal display device according to claim 1, wherein the liquid crystal molecules have negative dielectric anisotropy,
When the electric field is not applied to the liquid crystal layer, the liquid crystal molecules adjacent to the first substrate are arranged in parallel to the surface of the first substrate, and the liquid crystal molecules adjacent to the second substrate are arranged in parallel with the surface of the second substrate And a high-speed response characteristic. The liquid crystal display according to claim 1, further comprising: a first polarizer attached to the outside of the first substrate; and a second polarizer attached to the outside of the second substrate,
Wherein the long axis of the liquid crystal molecules arranged in parallel with the surface of the first substrate is arranged in parallel with the absorption axis of the first polarizing plate or the second polarizing plate when no electric field is applied to the liquid crystal layer A liquid crystal display device having a high-speed response characteristic. The liquid crystal display device according to claim 6, wherein a direction of a long axis of the liquid crystal molecules arranged in parallel to the surface of the first substrate is 0 to 90 degrees with respect to the first electrode and the second electrode, . The liquid crystal display device according to claim 6, wherein the liquid crystal display device displays black when no electric field is applied. The liquid crystal display device according to claim 1, wherein, in the ON state of the liquid crystal display device, the first voltage and the second voltage are respectively applied to the first electrode and the second electrode,
When a first voltage and a second voltage having different sizes are applied to the first electrode and the second electrode, an electric field in a diagonal direction is applied to the liquid crystal layer, and thus the liquid crystal molecules rotate in different directions And a high-speed response characteristic. 10. The liquid crystal display device according to claim 9, wherein the liquid crystal molecules have a negative dielectric anisotropy, whereby the long axis direction of the liquid crystal molecules rotates in a direction orthogonal to the oblique electric field direction applied to the liquid crystal layer, The liquid crystal display device comprising:

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112099270A (en) * 2020-09-30 2020-12-18 京东方科技集团股份有限公司 Horizontal electric field type display panel and display device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080049304A (en) 2006-11-30 2008-06-04 삼성전자주식회사 Liquid crystal display
KR20130056875A (en) 2011-10-25 2013-05-30 보에 테크놀로지 그룹 컴퍼니 리미티드 Fringe-field-switching mode liquid crystal display panel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080049304A (en) 2006-11-30 2008-06-04 삼성전자주식회사 Liquid crystal display
KR20130056875A (en) 2011-10-25 2013-05-30 보에 테크놀로지 그룹 컴퍼니 리미티드 Fringe-field-switching mode liquid crystal display panel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112099270A (en) * 2020-09-30 2020-12-18 京东方科技集团股份有限公司 Horizontal electric field type display panel and display device
US11899304B2 (en) 2020-09-30 2024-02-13 Beijing Boe Display Technology Co., Ltd. Liquid crystal display panel and driving methods therefor, and display apparatus

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