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WO2013018965A1 - Dispositif d'affichage à cristaux liquides à commutation horizontale - Google Patents

Dispositif d'affichage à cristaux liquides à commutation horizontale Download PDF

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Publication number
WO2013018965A1
WO2013018965A1 PCT/KR2012/000524 KR2012000524W WO2013018965A1 WO 2013018965 A1 WO2013018965 A1 WO 2013018965A1 KR 2012000524 W KR2012000524 W KR 2012000524W WO 2013018965 A1 WO2013018965 A1 WO 2013018965A1
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WIPO (PCT)
Prior art keywords
pixel electrode
pixel
electrode
liquid crystal
voltage
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Application number
PCT/KR2012/000524
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English (en)
Korean (ko)
Inventor
윤태훈
송동한
김기한
Original Assignee
부산대학교 산학협력단
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Priority claimed from KR1020110077050A external-priority patent/KR101383785B1/ko
Priority claimed from KR1020110085241A external-priority patent/KR101375243B1/ko
Application filed by 부산대학교 산학협력단 filed Critical 부산대학교 산학협력단
Publication of WO2013018965A1 publication Critical patent/WO2013018965A1/fr

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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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0434—Flat panel display in which a field is applied parallel to the display plane

Definitions

  • the present invention relates to a liquid crystal display device. Specifically, in a horizontal switching mode liquid crystal display device in which liquid crystal molecules are rotated on a plane parallel to a substrate, a horizontal switching mode liquid crystal in which an in-plane electric field formed between each electrode overlaps. It relates to a display device.
  • a liquid crystal display device is a device for displaying a desired image by applying an electric field to a liquid crystal material having an anisotropic dielectric constant injected between two substrates, and controlling the amount of light transmitted through the substrate by adjusting the intensity of the electric field.
  • Liquid crystal displays require high transmittance of liquid crystals, fast response times, and the like. Due to the characteristics of the liquid crystal display, only about 20 to 30% of light emitted from the backlight passes through the liquid crystal display.
  • the transmittance is about 28%, and when using the improved electrode structure of the FFS mode (Fringe Field Switching) mode, it is about 29%. It shows transmittance. This shows low transmittance characteristics compared to TN (Twisted Nematic) mode having a transmittance of about 34%.
  • the TN mode Since the advent of the liquid crystal display device, the most commonly used liquid crystal mode for displays such as laptops and monitors is the TN mode.
  • the TN mode has a high transmittance of about 34% and has advantages in terms of processes.
  • the liquid crystal mode has a narrow viewing angle at the left and right or up and down of the liquid crystal display.
  • the liquid crystal mode developed to cope with this is an IPS or FFS mode using horizontal switching.
  • the IPS or FFS mode rotates the liquid crystal molecules in a plane parallel to the substrate, and thus exhibits a better viewing angle than the TN mode.
  • these two modes show lower transmittance characteristics than the TN mode because there is a portion in which the liquid crystal does not rotate due to the electrode structure.
  • FFS mode has emerged to address the shortcomings of IPS's low transmittance and high drive voltage, but still do not exceed 30%.
  • the present invention is to solve the problem of the IPS or FFS mode liquid crystal display using the horizontal switching of the prior art, each electrode in the horizontal switching mode liquid crystal display device to rotate the liquid crystal molecules on a plane parallel to the substrate It is an object of the present invention to provide a horizontal switching mode liquid crystal display device in which an in-plane electric field formed therebetween is overlapped.
  • the present invention is a horizontal switching mode in which the liquid crystal molecules are rotated on a plane parallel to the substrate in order to increase the transmittance by applying the magnitude of the horizontal electric field voltage applied to the liquid crystal layer at three or more voltage levels. It is an object of the present invention to provide a switching mode liquid crystal display.
  • the present invention has an electrode structure of the IPS mode and uses a three or more voltage level instead of two voltage levels to widen the range of the horizontal electric field to ensure a high transmittance compared to the IPS mode or FFS mode It is an object of the present invention to provide a horizontal switching mode liquid crystal display.
  • three voltage levels are formed by applying a voltage of Vc + V 1 to both electrodes 1 and Vc-V 2 to electrodes 1 based on the electrode C to which the voltage of Vc is applied.
  • Vc + V 1 a voltage of Vc + V 1 to both electrodes 1 and Vc-V 2 to electrodes 1 based on the electrode C to which the voltage of Vc is applied.
  • the liquid crystal is rotated to a portion where the liquid crystal cannot rotate and thus the transmittance decreases, thereby achieving high transmittance. It is an object of the present invention to provide a horizontal switching mode liquid crystal display device.
  • the present invention is to change the shape and material of the pixel electrodes in the horizontal switching mode liquid crystal display device for rotating the liquid crystal molecules on a plane parallel to the substrate so that the in-plane electric field formed between the respective electrodes even under the same voltage application conditions It is an object of the present invention to provide a horizontal switching mode liquid crystal display.
  • An object of the present invention is to provide a horizontal switching mode liquid crystal display device in which an in-plane electric field formed between each electrode is overlapped even under a condition of applying the same voltage to the pixel electrodes to increase transmittance.
  • the present invention has an electrode structure of the IPS mode, and even in the same voltage application conditions, the in-plane electric field formed between each electrode is overlapped in a way of increasing the range of the horizontal electric field to have a higher transmittance than the IPS mode or FFS mode SUMMARY OF THE INVENTION
  • An object of the present invention is to provide a horizontal switching mode liquid crystal display device capable of ensuring a reliability.
  • the present invention provides a horizontal switching mode liquid crystal display device having a high transmittance by rotating the liquid crystal to a portion where the liquid crystal cannot be rotated so that the transmittance is reduced by overlapping the in-plane electric field formed between the electrodes even under the same voltage application conditions.
  • the purpose is to provide.
  • a horizontal switching mode liquid crystal display device including: a lower substrate; pixel electrodes separately formed in a unit pixel area on the lower substrate; Among the pixel electrodes, other pixel electrodes positioned on both sides of the one electrode used as a common electrode are driven at different voltages so that an in-plane electric field formed between the respective electrodes overlaps. do.
  • each of the one electrode used as the common electrode and the outermost sides of both sides of the common electrode respectively
  • Other pixel electrodes except for the N-th pixel electrodes are applied to the common electrode and the N-th pixel electrode on both sides by floating or applying an arbitrary voltage other than the voltage applied to the common electrode and the N-th pixel electrode. It is characterized in that the driving voltage is automatically applied to the floating pixel electrodes between the voltage levels, or the in-plane electric field is formed by the voltage applied between the common electrode and the N-th pixel electrode.
  • the pixel electrodes separated in the unit pixel area on the lower substrate may be formed in the same layer or in different layers with an insulating layer therebetween.
  • the electrode widths of the pixel electrodes separately formed in the unit pixel area on the lower substrate may be 1 ⁇ m to 10 ⁇ m, and the interval between the electrodes may be 1 ⁇ m to 30 ⁇ m.
  • a horizontal switching mode liquid crystal display device including: a lower substrate; pixel electrodes separately formed in a unit pixel area on the lower substrate; The voltage V c is applied to the pixel electrode C to be used, the voltage V c + V 1 is applied to the pixel electrode 1 positioned on one side of the pixel electrode C, and the pixel electrode positioned on the other side of the pixel electrode C.
  • the voltage (V c -V 2 ) is applied to 2 so that the in-plane electric field formed between each electrode is overlapped.
  • the voltage level of the pixel electrode C is plotted, and one of the pixel electrode 1 and the pixel electrode 2 is used as a common electrode.
  • the voltage (V c) is applied to a pixel electrode C and the voltage (V c + V 1) is applied to the pixel electrode 1 and between the voltage (V c) is applied to a pixel electrode C and the voltage (V c -V 2)
  • First in-plane electric fields are respectively formed between the applied pixel electrodes 2, and between the pixel electrode 1 to which the voltage (V c + V 1 ) is applied and the pixel electrode 2 to which the voltage (V c -V 2 ) is applied.
  • a two in-plane electric field is formed, and the first and second in-plane electric fields overlap in the entire area of the unit pixel area.
  • a horizontal switching mode liquid crystal display device including: a lower substrate; pixel electrodes separately formed in a unit pixel area on the lower substrate; the pixel electrode is used as electrode voltage (V c) is applied and the voltage to the pixel electrode 1 which is located on one side of the common electrode (V c -V 2) is applied, the voltage to the pixel electrode 3 (V c -V 4 ) between each of the electrodes to ensure that the application is approved, is applied to the voltage (V c + V 1) to the pixel electrode 2 which is located on the other side of the common electrode, a voltage (V c + V 3) to the pixel electrode 4 Formed in-plane electric field is characterized by overlapping.
  • a first in-plane electric field is formed between the pixel electrode 3, the pixel electrode 1, the pixel electrode C used as the pixel electrode 1, the pixel electrode C and the pixel electrode 2, the pixel electrode 2, and the pixel electrode 4,
  • a second in-plane electric field is formed between the pixel electrode 3 and the pixel electrode C, the pixel electrode 1 and the pixel electrode 2, the pixel electrode C and the pixel electrode 4, and a third in-plane electric field between the pixel electrode 3 and the pixel electrode 4 Is formed to overlap the first, second, and third inplane electric fields in the entire region of the pixel region.
  • a horizontal switching mode liquid crystal display device includes a lower substrate; used as a common electrode in any one layer of a unit pixel region on the lower substrate; Another pixel electrode 3 and a pixel electrode 4 formed on both outer edges of the pixel electrode C and the pixel electrode C; another pixel electrode 1 formed on the other layer between the one layer and the insulating layer; A pixel electrode 2; a voltage V c is applied to the pixel electrode C, a voltage V c -V 2 is applied to the pixel electrode 1, and a voltage V c -V 4 is applied to the pixel electrode 3.
  • a voltage (V c + V 1 ) is applied to the pixel electrode 2
  • a voltage (V c + V 3 ) is applied to the pixel electrode 4 so that an in-plane electric field formed between the respective electrodes overlaps. It is done.
  • a first in-plane electric field is formed between the pixel electrode 3 and the pixel electrode 1, the pixel electrode 1 and the pixel electrode C, the pixel electrode C and the pixel electrode 2, and the pixel electrode 2 and the pixel electrode 4.
  • a second in-plane electric field is formed between the pixel electrode 2
  • a third in-plane electric field is formed between the pixel electrode 3 and the pixel electrode C, the pixel electrode C, and the pixel electrode 4, and between the pixel electrode 3 and the pixel electrode 4.
  • a fourth in-plane electric field is formed in the first, second, third, and fourth in-plane electric field in the entire region of the pixel region.
  • a horizontal switching mode liquid crystal display device including: a lower substrate; pixel electrodes separately formed in a unit pixel area on the lower substrate; Among the pixel electrodes, the thickness of the other pixel electrodes positioned on both sides of the pixel electrode, which is used as a common electrode, is varied so that the voltage flowing through each electrode varies even when the same voltage is applied by the cross-sectional area of the electrodes.
  • the in-plane electric field formed between each electrode is characterized in that to overlap.
  • a horizontal switching mode liquid crystal display device including: a lower substrate; pixel electrodes separately formed in a unit pixel area on the lower substrate; Among the pixel electrodes, the width of the other pixel electrodes positioned on both sides of the pixel electrode, which is used as a common electrode, is varied so that the voltage flowing through each electrode is different even when the same voltage is applied by the cross-sectional area of the electrodes.
  • the in-plane electric field formed between each electrode is characterized in that to overlap.
  • a horizontal switching mode liquid crystal display device including: a lower substrate; pixel electrodes separately formed in a unit pixel area on the lower substrate; Each of the other pixel electrodes positioned on both sides of one of the pixel electrodes, which is used as a common electrode, is formed of a material having a different electrical conductivity, so that each electrode is applied even under the condition of applying the same voltage due to the difference in electrical conductivity of the electrodes.
  • the in-plane electric field formed between the respective electrodes is characterized in that overlapping the entire area of the unit pixel area.
  • an alignment layer formed on a lower substrate on which pixel electrodes separated in the unit pixel region are formed to align the liquid crystal molecules.
  • the alignment layer may be a horizontal alignment layer such that the arrangement of liquid crystal molecules may have a horizontal direction with respect to the substrate, or a vertical alignment layer such that the arrangement of liquid crystal molecules may have a vertical direction with respect to the substrate, or 0 ° or more and 90 ° for the alignment of liquid crystal molecules. It has the following rubbing direction, It is characterized by the above-mentioned.
  • the liquid crystals driven by the in-plane electric field formed to overlap each other may have positive dielectric anisotropy or negative dielectric anisotropy.
  • the pixel electrodes separately formed in the unit pixel region on the lower substrate may be alternately patterned in a slit form to have a multi-domain structure in which the alignment of liquid crystal molecules is divided in the unit pixel region.
  • Such a horizontal switching mode liquid crystal display according to the present invention has the following effects.
  • the in-plane electric field may be overlapped in each divided region to widen the range of the horizontal electric field.
  • transmittance may be increased by applying three or more voltage levels of the horizontal electric field voltage applied to the liquid crystal layer.
  • the in-plane electric field formed between the respective electrodes may be overlapped even under the condition of applying the same voltage to the pixel electrodes.
  • transmittance can be increased by eliminating areas that do not rotate even when an electric field is applied by allowing each inplane electric field having different intensities to overlap in an arbitrary area of the pixel area.
  • a wide viewing angle of the liquid crystal display may be secured by forming a multi domain.
  • the in-plane electric field formed between the respective electrodes may be overlapped even under the condition of applying the same voltage to the pixel electrodes, which is advantageous in terms of power consumption and driving method.
  • FIG. 1 is a block diagram showing an electrode structure of a liquid crystal display according to the present invention
  • FIG. 2 is a configuration diagram showing electric field formation of a liquid crystal display according to the present invention.
  • 3 and 4 are graphs comparing the distribution and transmittance of liquid crystal molecules according to electric field formation of the liquid crystal display according to the present invention.
  • FIG. 5 and 6 are diagrams illustrating an electrode structure for forming a multi-domain of a liquid crystal display according to the present invention.
  • FIG. 7 and 8 are graphs comparing the transmittances of the VA-IPS mode liquid crystal display using the electrode structure according to the present invention.
  • FIG. 9 is a configuration diagram illustrating an electrode structure of a liquid crystal display according to another exemplary embodiment of the present invention.
  • FIG. 10 is a configuration diagram illustrating the electric field formation of a liquid crystal display according to another exemplary embodiment of the present invention.
  • FIG. 11 is a configuration diagram illustrating an electrode structure of a liquid crystal display according to another exemplary embodiment of the present invention.
  • FIG. 12 is a block diagram showing the formation of an electric field of a liquid crystal display according to another exemplary embodiment of the present invention.
  • FIG. 13 is a graph showing a transmittance curve according to an applied voltage of a liquid crystal display according to the present invention.
  • FIGS. 14 and 15 are diagrams illustrating an electrode structure and electric field formation of a liquid crystal display according to another exemplary embodiment of the present invention.
  • 16 and 17 are schematic diagrams illustrating an electrode structure and an electric field of a liquid crystal display according to another exemplary embodiment of the present invention.
  • FIGS. 18 and 19 are configuration diagrams illustrating an electrode structure and an electric field of a liquid crystal display according to another exemplary embodiment of the present invention.
  • the present invention is such that the in-plane electric field formed between each electrode overlaps in the liquid crystal display of the horizontal switching mode in which the liquid crystal molecules are rotated on a plane parallel to the substrate.
  • the first method of applying the magnitude of the horizontal electric field voltage applied to the liquid crystal layer at three or more voltage levels to overlap the in-plane electric field formed between the respective electrodes, and the shape and material of the pixel electrodes And a second method of overlapping the in-plane electric field formed between the respective electrodes even under the same voltage application conditions.
  • the configuration of applying the magnitude of the horizontal electric field voltage applied to the liquid crystal layer at three or more voltage levels to overlap the in-plane electric field formed between the respective electrodes is as follows.
  • FIG. 1 is a block diagram showing the electrode structure of the liquid crystal display device according to the present invention
  • Figure 2 is a block diagram showing the electric field formation of the liquid crystal display device according to the present invention.
  • 3 and 4 are graphs showing the distribution and transmittance of liquid crystal molecules according to electric field formation of the liquid crystal display according to the present invention.
  • the present invention is to ensure a high transmittance compared to the IPS mode or FFS mode by widening the range of the horizontal electric field formed in the liquid crystal display device, has an electrode structure of the IPS mode, three or more than two voltage levels It has a driving method using a voltage level.
  • a liquid crystal display according to the present invention includes a pixel electrode formed on a lower substrate, an alignment layer formed on a lower substrate on which the pixel electrode is formed, and a liquid crystal layer positioned between the lower substrate and the upper substrate and aligned by the alignment layer.
  • the pixel electrode is configured to form three or more voltage levels, and different voltages are applied to a plurality of electrodes positioned on both sides of the common electrode with respect to the common electrode (pixel electrode C).
  • other electrodes except for the electrodes located at the outermost sides of the common electrode may have a voltage level.
  • the plurality of electrodes positioned on both sides of the common electrode centering on the common electrode has an electrode width of 1 ⁇ m to 10 ⁇ m, and an interval between the electrodes is formed of 1 ⁇ m to 30 ⁇ m, and each pixel region is The electrodes are arranged to have a plurality of domains.
  • the liquid crystal layer has positive dielectric anisotropy or negative dielectric anisotropy.
  • the alignment layer may be a horizontal alignment layer having a horizontal direction with respect to the lower substrate or more than an arrangement of liquid crystal molecules, or a vertical alignment layer having a vertical direction with respect to the upper and lower substrates, or 0 ° for the alignment of liquid crystal molecules. It has a rubbing direction of 90 degrees or less.
  • the present invention drives the liquid crystal display using three or more voltage levels to improve transmittance, secure a wide viewing angle, and drive a low power, thereby widening the range of the horizontal electric field formed in the liquid crystal display.
  • the liquid crystal display device is to improve the low transmittance caused by the liquid crystal does not rotate between the pixel electrode center and the pixel electrode in the IPS mode or FFS mode liquid crystal display device.
  • FIG. 1 illustrates an electrode structure of a horizontal switching mode liquid crystal display according to a first embodiment of the present invention, wherein a pixel electrode capable of applying three or more voltage levels on a lower substrate using a transparent glass substrate or a plastic substrate It is formed into a structure having a.
  • the pixel electrodes are separated on the lower substrate 100, and the other pixel electrodes 1 210 and the pixel electrode 2 220 are disposed on both sides of the pixel electrode C 200 that is used as a common electrode among the separated pixel electrodes. This is the structure that is formed.
  • the layout of the electrodes is alternately patterned in a slit form as shown in FIGS. 5 and 6.
  • any one of the pixel electrode C 200, the pixel electrode 1 210, and the pixel electrode 2 220 may be used as the common electrode.
  • the voltage V c is applied to the pixel electrode C 200 used as the common electrode, and the pixel electrode A voltage V c + V 1 is applied to 1 210, and a voltage V c -V 2 is applied to pixel electrode 2 220.
  • the voltage level of the pixel electrode C 200 may be floated.
  • one of the pixel electrode 1 210 and the pixel electrode 2 220 may be a common electrode. Each electrode can be applied with a voltage (V c + V 1 ) and a voltage (V c -V 2 ).
  • the in-plane electric field is overlapped in one pixel area as follows.
  • the voltage (V c) that is applied to a pixel electrode C (200) and a voltage (V c + V 1) is applied to the pixel electrode 1 210, and between the voltage (V c) applied to the pixel electrode First in-plane fields are formed between the C 200 and the pixel electrode 2 220 to which the voltage V c -V 2 is applied, and both sides of the pixel electrode C 200 are formed.
  • a second in-plane electric field is formed between the pixel electrode 1 210 to which the voltage V c + V 1 is applied and the pixel electrode 2 220 to which the voltage V c -V 2 is applied.
  • the pixel electrode 2 when using the three voltage levels is applied to the voltage (V c + V 1) to the pixel electrode 1 (210) on each side, based on the pixel electrode C (200), applying a voltage of V c, the pixel electrode 2 ( The voltage (V c -V 2 ) is applied to 220 to form three voltage levels so that the in-plane electric field is overlapped in the pixel region, so that the liquid crystal does not rotate in the general IPS mode or FFS mode, resulting in a decrease in transmittance. The liquid crystal is rotated to provide high transmittance.
  • FIG. 3 shows the distribution and transmittance of liquid crystal molecules according to the electric field formation of the conventional IPS mode liquid crystal display
  • FIG. 4 shows the distribution and transmittance of liquid crystal molecules according to the electric field formation of the liquid crystal display according to the present invention.
  • the liquid crystal display using the conventional IPS mode has an electrode structure that can use two voltage levels, applies a voltage of V c to electrode C used as a common electrode, and applies the same voltage (V) to electrode 1 and electrode 2.
  • V voltage
  • c + V or V c -V is applied to form an in-plane electric field between the electrodes.
  • FIG. 4 shows the distribution of liquid crystal molecules according to the formation of the electric field of the liquid crystal display and the transmittance characteristics thereof.
  • FIG. 5 and 6 are configuration diagrams showing an electrode structure for forming a multi-domain of the liquid crystal display according to the present invention.
  • the electrodes are alternately patterned in a slit form.
  • the plurality of pixel electrodes 410 and 420 positioned at both sides of the common electrode with respect to the common electrode (pixel electrode C) 400 have an electrode width of 1 ⁇ m to 10 ⁇ m, and a gap between the electrodes is 1. It is preferable that the electrodes are formed to have a thickness of 30 ⁇ m to 30 ⁇ m, and the pixel regions have a plurality of domains.
  • Such an electrode pattern is not limited to the structures in FIGS. 5 and 6, and may be patterned into other structures and shapes.
  • Such electrodes are patterned alternately in a slit form to form a multi-domain to secure a wide viewing angle of the liquid crystal display.
  • FIG. 7 shows the transmittance of the VA-IPS mode liquid crystal display device applying the conventional IPS electrode structure.
  • VA-IPS Conventional Vertical Alignment-In Plane Switching
  • This mode initially has a dark state.
  • a voltage of V c is applied to the pixel electrode C used as a common electrode, and the same voltage (V c + V or V c -V) is applied to the pixel electrode 1 and the pixel electrode 2 to form an in-plane electric field between the electrodes.
  • V c + V or V c -V the same voltage
  • the vertically aligned liquid crystal molecules are arranged horizontally to have a bright state.
  • the liquid crystal does not rotate, there is a disadvantage that the transmittance is low.
  • FIG 8 shows the transmittance of the VA-IPS mode liquid crystal display device applying the electrode structure according to the present invention.
  • the electrode structure for forming a horizontal electric field uses the structure proposed in the present invention, and realizes a bright state by rotating the vertically aligned liquid crystal molecules by forming a horizontal electric field.
  • the liquid crystal molecules cannot rotate in the conventional VA-IPS mode, so that a transmittance of 5% or more can be secured compared to the conventional mode.
  • FIG. 9 is a diagram illustrating an electrode structure of a liquid crystal display according to another exemplary embodiment.
  • FIG. 10 is a diagram illustrating electric field formation of a liquid crystal display according to another exemplary embodiment.
  • FIG. 1 and 2 illustrate an electrode structure in which a voltage level is added to an electrode structure, in which pixel electrodes are separated on a lower substrate 600, and a pixel electrode used as a common electrode among the separated pixel electrodes (
  • the pixel electrodes 1, 3 (611) 613 and the pixel electrodes 2, 4 612, 614 are formed on both sides of the 610.
  • the voltage V c is applied to the pixel electrode 610 used as the common electrode, and the pixel electrode 1 611 voltage (V c -V 2), the voltage (V c + V 1) is applied to the pixel electrode 3 613 voltage (V c -V 4) is applied and the pixel electrode 2 (612) in this The voltage V c + V 3 is applied to the pixel electrode 4 614.
  • V c + V 1 is +1 V. If V c + V 3 may be a form that +3 V is applied.
  • the pixel electrode 1 611 and the pixel electrode 2 612 may be floated.
  • the in-plane electric field is formed to overlap in one pixel area as follows.
  • a first in-plane electric field is formed between the electrode 2 612, the pixel electrode 2 612, and the pixel electrode 4 614, and the pixel electrode 610 and the pixel electrode used as the common electrode with the pixel electrode 3 613.
  • a second in-plane electric field is formed between the first electrode 611 and the pixel electrode 2 612, the pixel electrode 610 used as the common electrode, and the pixel electrode 4 614, and the pixel electrode 3 613 and the pixel electrode 4.
  • a third inplane electric field is formed between the 614s so that the first, second, and third inplane electric fields overlap each other in the entire region of the pixel area.
  • FIG. 10 illustrates the distribution of liquid crystal molecules and its transmittance characteristics according to the formation of an electric field in the liquid crystal display when five voltage levels are used based on the electrode structure of FIG. 9.
  • FIG. 11 is a block diagram illustrating an electrode structure of a liquid crystal display according to another exemplary embodiment.
  • FIG. 12 is a block diagram showing electric field formation of a liquid crystal display according to another exemplary embodiment.
  • FIG. 11 illustrates an electrode structure according to a third exemplary embodiment of the present invention for patterning pixel electrodes by forming an insulating layer when forming a pattern electrode when one voltage level is added.
  • Pixel electrodes are separated on the lower substrate 800, and other pixel electrodes 3 813 and pixel electrodes 4 814 are formed on both sides of the pixel electrode 810 used as a common electrode among the separated pixel electrodes.
  • the insulating film is formed on the pixel electrode 810, the pixel electrode 3 813, and the pixel electrode 4 814, and the other pixel electrode 1 811 and the pixel electrode 2 812 are formed on the insulating film.
  • the voltage V c is applied to the pixel electrode 810 used as the common electrode, and the pixel electrode 1 811 voltage (V c -V 2), the voltage (V c + V 1) is applied to the pixel electrode 3 813 voltage (V c -V 4) is applied and the pixel electrode 2 (812) in this The voltage V c + V 3 is applied to the pixel electrode 4 814.
  • V c + V 1 is +1 V. If V c + V 3 may be a form that +3 V is applied.
  • the pixel electrode 1 811 and the pixel electrode 2 812 may be floated.
  • the in-plane and fringe fields are overlapped in one pixel area as follows.
  • the pixel electrode 3 813 and the pixel electrode 1 811, the pixel electrode 810 used as the common electrode with the pixel electrode 1 811, and the pixel electrode 810 and the pixel used as the common electrode A first in-plane electric field is formed between the electrode 2 812, the pixel electrode 2 812, and the pixel electrode 4 814, and the second in-plane electric field is formed between the pixel electrode 1 811 and the pixel electrode 2 812.
  • a third in-plane electric field is formed between the pixel electrode 3 813 and the pixel electrode 810 used as the common electrode, the pixel electrode 810 used as the common electrode, and the pixel electrode 4 814.
  • a fourth in-plane electric field is formed between the pixel electrode 3 813 and the pixel electrode 4 814 so that the first, second, third, and fourth in-plane electric fields overlap each other in the entire pixel area.
  • Electrodes are formed in a layer structure.
  • an electric field is also formed between the electrodes of different layers.
  • FIG. 12 shows the distribution of liquid crystal molecules and their transmittance characteristics according to the electric field formation of the liquid crystal display when the five voltage levels according to the present invention are used based on the electrode structure of FIG. 11.
  • the voltage level applied to the pixel electrodes positioned on one side of the common electrode increases toward the outer electrode and is applied to the pixel electrodes positioned on the other side.
  • Voltages of different levels may be applied to the electrodes by decreasing the voltage level toward the electrode positioned at the outer side.
  • a voltage may be applied to each of the formed pattern electrodes, it is also possible to drive in a form in which voltage is automatically applied between two voltage levels by floating the electrodes other than the pixel electrode and the outermost electrode.
  • FIG. 13 illustrates a liquid crystal display using the conventional IPS mode and the FFS mode, and using three voltage levels and five voltage levels (one layer and three layers), respectively, using the pixel electrode structure proposed in the present invention.
  • the transmittance is increased by more than 5% and the driving voltage is reduced by 2V.
  • the present invention forms a horizontal electric field using three or more voltage levels while maintaining a wide viewing angle characteristic as in the conventional IPS mode or the FFS mode.
  • a horizontal switching liquid crystal display device capable of improving transmittance and enabling low voltage driving.
  • FIGS. 14 and 15 are schematic diagrams illustrating an electrode structure and an electric field of a liquid crystal display according to a fourth exemplary embodiment of the present invention.
  • FIGS. 16 and 17 are schematic diagrams illustrating an electrode structure and electric field formation of a liquid crystal display according to a fifth exemplary embodiment of the present invention
  • FIGS. 18 and 19 are schematic diagrams of a liquid crystal display according to a sixth exemplary embodiment of the present invention. It is a block diagram which shows electrode structure and electric field formation.
  • the present invention is to ensure a high transmittance compared to the IPS mode or FFS mode by widening the range of the horizontal electric field formed in the liquid crystal display device, has an electrode structure of the IPS mode and between each electrode even under the same voltage application conditions It has a driving scheme to overlap the in-plane electric field formed.
  • the in-plane electric field formed between the respective electrodes is preferably overlapped in the entire region of the unit pixel region.
  • the liquid crystal display according to the fourth to sixth embodiments of the present invention includes a pixel electrode formed on the lower substrate, an alignment layer formed on the lower substrate on which the pixel electrode is formed, and a position between the lower substrate and the upper substrate. And a liquid crystal layer oriented by the alignment film.
  • the pixel electrode may be configured to form three or more voltage levels.
  • the pixel electrode is formed under the condition of applying the same voltage to a plurality of electrodes positioned on both sides of the common electrode with respect to the common electrode (pixel electrode C).
  • the power transfer efficiency is different at each electrode.
  • the resistance value is changed by the difference in the cross-sectional area, and even when a voltage having the same magnitude is applied to each electrode, the voltage actually flowing to the electrode is different.
  • the magnitude of the voltage actually flowing to each electrode is different so that the electric fields applied to the liquid crystal layer are overlapped.
  • other electrodes except for the electrodes located at the outermost sides of the common electrode may have a voltage level.
  • the plurality of electrodes positioned on both sides of the common electrode centering on the common electrode has an electrode width of 1 ⁇ m to 10 ⁇ m, and an interval between the electrodes is 1 ⁇ m to 30 ⁇ m, and each pixel region is The electrodes are arranged to have a plurality of domains.
  • the liquid crystal layer has positive dielectric anisotropy or negative dielectric anisotropy.
  • the alignment layer may be a horizontal alignment layer such that the arrangement of liquid crystal molecules may have a horizontal direction with respect to the upper and lower substrates, or a vertical alignment layer such that the arrangement of liquid crystal molecules may have a vertical direction with respect to the upper and lower substrates, or 0 for the alignment of liquid crystal molecules. It has a rubbing direction of not less than 90 °.
  • liquid crystal displays are formed in such a manner that electric fields of different sizes are overlapped under the conditions of applying the same voltage for improving transmittance, securing a wide viewing angle, efficient driving, and low power driving.
  • the range of the horizontal electric field formed in the liquid crystal display device is widened.
  • the liquid crystal display according to the present invention is to improve the low transmittance caused by the liquid crystal does not rotate between the center of the pixel electrode and the pixel electrode in the liquid crystal display of the IPS mode or FFS mode.
  • FIG. 14 is a view illustrating an electrode structure of a horizontal switching mode liquid crystal display according to a fourth exemplary embodiment of the present invention, in which electrode formation thicknesses are different on a lower substrate using a transparent glass substrate or a plastic substrate.
  • the pixel electrodes are separated on the lower substrate 100, and the other pixel electrodes 1 210 and the pixel electrode 2 220 are disposed on both sides of the pixel electrode C 200, which is used as a common electrode among the separated pixel electrodes. This is the structure that is formed.
  • any one of the pixel electrode C 200, the pixel electrode 1 210, and the pixel electrode 2 220 may be used as the common electrode.
  • the widths of the electrodes are the same, and the spacing A between the electrodes is all the same.
  • the formation thickness B of the pixel electrode 2 220, the formation thickness C of the pixel electrode C 200, and the formation thickness C of the pixel electrode 1 210 are different from each other.
  • the voltage V c is applied to the pixel electrode C 200 used as the common electrode, and the pixel electrode Even when the voltage of a certain level is equally applied to the first 210 and the second pixel electrode 220, voltages having different magnitudes flow through the first electrode 210 and the second pixel electrode 220.
  • the in-plane electric field is overlapped in one pixel area even under the same voltage application condition due to the structure of different electrode formation thickness.
  • a first in-plane field is formed between the pixel electrode C 200 and the pixel electrode 1 210 and between the pixel electrode C 200 and the pixel electrode 2 220, respectively.
  • the second in-plane electric field is formed between the pixel electrode 1 210 and the pixel electrode 2 220 positioned at both sides of the pixel electrode C 200.
  • the electrode formation thickness is different so that the cross-sectional area is different, so that the in-plane electric field is overlapped in the pixel region even under the same voltage application conditions, so that the liquid crystal cannot rotate in the general IPS mode or FFS mode, causing the decrease in transmittance.
  • the liquid crystal is rotated up to a high transmittance.
  • FIG. 16 illustrates an electrode structure of a horizontal switching mode liquid crystal display according to a fifth exemplary embodiment of the present invention, in which electrode formation widths are changed to have different cross-sectional areas on a lower substrate using a transparent glass substrate or a plastic substrate.
  • the pixel electrodes are separated on the lower substrate 100, and the other pixel electrodes 1 210 and the pixel electrode 2 220 are disposed on both sides of the pixel electrode C 200, which is used as a common electrode among the separated pixel electrodes. This is the structure that is formed.
  • any one of the pixel electrode C 200, the pixel electrode 1 210, and the pixel electrode 2 220 may be used as the common electrode.
  • the spacing A between the electrodes and the formation height B of the electrodes are all the same.
  • the width C of the pixel electrode 2 220, the width D of the pixel electrode C 200, and the width E of the pixel electrode 1 210 are different from each other (E> D> C).
  • the voltage V c is applied to the pixel electrode C 200 used as the common electrode, and the pixel electrode Even when the voltage of a certain level is equally applied to the first 210 and the second pixel electrode 220, voltages having different magnitudes flow through the first electrode 210 and the second pixel electrode 220.
  • the in-plane electric field is overlapped in one pixel area even under the same voltage application condition by the structure in which the widths of the electrodes are different so that the cross-sectional area is different.
  • a first in-plane field is formed between the pixel electrode C 200 and the pixel electrode 1 210 and between the pixel electrode C 200 and the pixel electrode 2 220, respectively.
  • the second in-plane electric field is formed between the pixel electrode 1 210 and the pixel electrode 2 220 positioned at both sides of the pixel electrode C 200.
  • the structure of the electrodes having different widths allows the in-plane electric field to overlap in the pixel region even under the same voltage application conditions, thereby rotating the liquid crystal to a portion where the liquid crystal cannot be rotated in the general IPS mode or FFS mode, resulting in a decrease in transmittance.
  • the electrode structure of the liquid crystal display according to the sixth exemplary embodiment of the present invention is that the electrodes are made of a material having different electrical conductivity so that the voltage actually flowing to the electrode may be different even when a voltage having the same magnitude is applied.
  • FIG. 18 illustrates an electrode structure of a horizontal switching mode liquid crystal display according to a sixth embodiment of the present invention, in which electrodes are formed of materials having different electrical conductivity on a lower substrate using a transparent glass substrate or a plastic substrate.
  • the pixel electrodes are separated on the lower substrate 100, and the other pixel electrode 1 210 and the pixel electrode 2 220 are disposed on both sides of the pixel electrode C 200 which is used as a common electrode among the separated pixel electrodes. This is the structure that is formed.
  • any one of the pixel electrode C 200, the pixel electrode 1 210, and the pixel electrode 2 220 may be used as the common electrode.
  • the spacing A between the electrodes, the formation height B of the electrodes, and the width C of the electrodes are all the same, and the electrical conductivity of the pixel electrode 2 220, the pixel electrode C, and the pixel electrode 1 210 is different. will be.
  • a voltage V c is applied to the pixel electrode C 200 used as a common electrode, and the pixel electrode Even when the voltage of a certain level is equally applied to the first 210 and the second pixel electrode 220, voltages having different magnitudes flow through the first electrode 210 and the second pixel electrode 220.
  • the in-plane electric field overlaps in one pixel region even under the same voltage application condition as follows.
  • a first in-plane field is formed between the pixel electrode C 200 and the pixel electrode 1 210 and between the pixel electrode C 200 and the pixel electrode 2 220, respectively.
  • the second in-plane electric field is formed between the pixel electrode 1 210 and the pixel electrode 2 220 positioned at both sides of the pixel electrode C 200.
  • the electrodes are formed of materials having different electrical conductivity so that the in-plane electric field overlaps in the pixel region even under the same voltage application conditions, thereby rotating the liquid crystal to the part where the liquid crystal cannot be rotated in the general IPS mode or the FFS mode, resulting in reduced transmittance. To provide high transmittance.
  • the electrode width, the thickness, and the forming material are different so that the in-plane electric field is overlapped in the pixel region even under the same voltage application condition, or the separation distance between the electrodes is different. It is obvious that the electrode may be formed by other methods such as changing the resistance value by changing the shape of the same material.
  • the in-plane electric field formed between the electrodes is overlapped in the liquid crystal display of the horizontal switching mode in which the liquid crystal molecules are rotated on a plane parallel to the substrate.
  • the present invention provides a liquid crystal display device in a horizontal switching mode in which an in-plane electric field formed between each electrode is overlapped to widen the range of the horizontal electric field and improve transmittance and viewing angle characteristics to enable low voltage driving.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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  • General Physics & Mathematics (AREA)
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Abstract

La présente invention concerne un affichage à cristaux liquides dans un mode de commutation horizontale. Des molécules de cristaux liquides sont mises à tourner sur un plan qui est parallèle à un substrat et des champs électriques dans le plan formés entre chaque électrode se chevauchent mutuellement. L'affichage à cristaux liquides comprend : un substrat inférieur ; et des électrodes de pixel formées séparément dans des régions de pixels unitaires sur le substrat inférieur, les champs électriques dans le plan formés entre chaque électrode se chevauchent mutuellement par l'attaque d'autres électrodes de pixel, qui sont situées sur les deux côtés de n'importe quelle électrode utilisée en tant qu'électrode commune parmi les électrodes de pixel, à différents niveaux de tension.
PCT/KR2012/000524 2011-08-02 2012-01-20 Dispositif d'affichage à cristaux liquides à commutation horizontale WO2013018965A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020110077050A KR101383785B1 (ko) 2011-08-02 2011-08-02 수평 스위칭 모드 액정 표시 장치
KR10-2011-0077050 2011-08-02
KR10-2011-0085241 2011-08-25
KR1020110085241A KR101375243B1 (ko) 2011-08-25 2011-08-25 수평 스위칭 모드 액정 표시 장치

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WO2013018965A1 true WO2013018965A1 (fr) 2013-02-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020034857A (ko) * 2000-10-31 2002-05-09 아끼구사 나오유끼 액정표시패널 및 그 개발 방법
KR20050053441A (ko) * 2003-12-02 2005-06-08 엘지.필립스 엘시디 주식회사 수평 전계 인가형 액정표시패널의 검사장치 및 검사방법
KR20070054010A (ko) * 2005-11-22 2007-05-28 삼성전자주식회사 표시장치
KR20080057409A (ko) * 2006-12-20 2008-06-25 부산대학교 산학협력단 액정표시장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020034857A (ko) * 2000-10-31 2002-05-09 아끼구사 나오유끼 액정표시패널 및 그 개발 방법
KR20050053441A (ko) * 2003-12-02 2005-06-08 엘지.필립스 엘시디 주식회사 수평 전계 인가형 액정표시패널의 검사장치 및 검사방법
KR20070054010A (ko) * 2005-11-22 2007-05-28 삼성전자주식회사 표시장치
KR20080057409A (ko) * 2006-12-20 2008-06-25 부산대학교 산학협력단 액정표시장치

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