KR101041613B1 - Transverse electric field liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a transverse electric field type liquid crystal display which realizes a high aperture ratio, a wide viewing angle, and high luminance.

In the transverse electric field type liquid crystal display device, in order to maintain the alignment direction of the liquid crystal having the maximum transmittance even when a high voltage of a predetermined voltage or more is applied, the common electrodes and the pixel electrodes are formed on the lower substrate by using "a" and "b". It is characterized in that the configuration, symmetrical configuration in the diagonal direction to each other, the upper substrate further comprises a common electrode having the same shape as the common electrode.

Description

Transverse electric field liquid crystal display device {In-Plane switching mode LCD}             

1 is a cross-sectional view schematically showing a part of a general transverse electric field type liquid crystal display device,

2 is an enlarged plan view showing the configuration of a conventional array substrate for a transverse electric field type liquid crystal display device;

3A and 3B are cross-sectional views illustrating operations of off and on states of a general transverse electric field type liquid crystal display device, respectively.

4 is a graph illustrating voltage-transmittance (V-T) characteristics of a transverse electric field liquid crystal display according to the related art.

5 is a view showing a wide viewing angle characteristics of a conventional transverse electric field type liquid crystal display device,

6 is an enlarged plan view showing the configuration of a lower substrate for a transverse electric field type liquid crystal display device according to the present invention;

7 is an enlarged plan view showing a part of a transverse electric field type upper substrate according to the present invention;

8A and 8B are diagrams illustrating the operation of liquid crystals when the voltage is turned off and on, respectively.

FIG. 9 is a diagram illustrating a result of simulating an arrangement of liquid crystals positioned in regions included in S of FIGS. 6 and 7.

FIG. 10 is a cross-sectional view illustrating the arrangement state of the liquid crystals positioned along the cut region of FIG. 9 and the transmittance characteristics thereof according to FIG. 9.

11A to 11E and 12A to 12E are cross-sectional views illustrating a manufacturing process of an array substrate for a transverse electric field type liquid crystal display device according to the present invention, in the order of a process.

<Brief description of the main parts of the drawing>

100 substrate 102 gate electrode

104: gate wiring 106a, 106b: vertical portion of the common electrode

108: horizontal portion of the common electrode 112: active layer

116: source electrode 118: drain electrode

120: data wiring 126a: vertical portion of pixel electrode

126b: horizontal portion of the pixel electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a transverse electric field type liquid crystal display device having a high aperture ratio, a wide viewing angle, and a high brightness characteristic.

Generally, the driving principle of a liquid crystal display device utilizes the optical anisotropy and polarization properties of a liquid crystal. Since the liquid crystal has a long structure, it has a directionality in the arrangement of molecules, and the direction of the molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal.

Therefore, when the molecular alignment direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular alignment direction of the liquid crystal by optical anisotropy, so that image information can be expressed.

Currently, an active matrix liquid crystal display device (AM-LCD: below Active Matrix LCD, abbreviated as liquid crystal display device) in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner has the best resolution and video performance. It is attracting attention.

The liquid crystal display includes a color filter substrate (upper substrate) on which a common electrode is formed, an array substrate (lower substrate) on which a pixel electrode is formed, and a liquid crystal filled between upper and lower substrates. In such a manner that the liquid crystal is driven by an electric field applied up and down, the pixel electrode has excellent characteristics such as transmittance and aperture ratio.

However, the liquid crystal drive by the electric field applied up-down has a disadvantage that the viewing angle characteristics are not excellent. Therefore, new techniques have been proposed to overcome the above disadvantages. The liquid crystal display device to be described below has an advantage of excellent viewing angle characteristics by a liquid crystal driving method using a transverse electric field.                         

1 is an enlarged cross-sectional view illustrating a cross section of a general transverse electric field type liquid crystal display device.

As shown in the drawing, the transverse electric field type liquid crystal display device B is composed of a color filter substrate B1 and an array substrate B2 spaced apart from each other, and a liquid crystal layer 90 between the color filter substrate and the array substrates B1 and B2. ) Is intervened.

The array substrate B2 includes a thin film transistor T, a common electrode 58, and a pixel electrode 72 for each of the pixels P1 and P2 defined in the transparent insulating substrate 50.

The thin film transistor T includes a gate electrode 52, a semiconductor layer 62 having an insulating layer 60 interposed therebetween, and a source configured to be spaced apart from each other on the semiconductor layer 62. And drain electrodes 64 and 66.

In the above configuration, the common electrode 58 and the pixel electrode 72 are configured to be spaced apart from each other in parallel on the same substrate.

In general, the common electrode 58 is made of the same material as the gate electrode 52, and the pixel electrode 72 is made of the same material as the source and drain electrodes 64 and 66. However, as shown in order to increase the aperture ratio, the pixel electrode 72 may be formed as a transparent electrode.

Although not shown, a gate wiring (not shown) extending along one side of the pixels P1 and P2 and a data wiring (not shown) extending in a direction perpendicular thereto are formed, and the common electrode 58 is disposed on the common electrode 58. A common wiring (not shown) for applying a voltage is configured.

The color filter substrate B1 has a black matrix 32 formed on a transparent insulating substrate 30 corresponding to the gate wiring (not shown), the data wiring (not shown), and the thin film transistor T. Color filters 34a and 34b are formed corresponding to the pixels P1 and P2.

The liquid crystal layer 90 is operated by the horizontal electric field 95 of the common electrode 58 and the pixel electrode 72.

Hereinafter, referring to FIG. 2, a configuration of an array substrate constituting the transverse electric field type liquid crystal display device as described above will be described. (The array substrate of FIG. 2 is an electrode that is opaque, unlike the configuration of FIG. 1. The example formed by this is demonstrated.)

2 is a plan view schematically illustrating a configuration of a conventional array substrate for a transverse electric field type liquid crystal display device.

As shown in the drawing, the gate wiring 54 extending in one direction on the substrate 50 and the data wiring 68 are formed so as to vertically intersect the gate wiring 54 to define the pixel region P. As shown in FIG. .

In addition, the common wiring 56 is formed to cross the pixel region P while being spaced in parallel with the gate wiring 54.

At the intersection of the gate line 54 and the data line 68, the gate electrode 52 connected to the gate line 54, the semiconductor layer 62 on the gate electrode 52, and the semiconductor layer 62 are provided. The thin film transistor T including the upper source electrode 64 and the drain electrode 66 is configured.

The pixel region P includes a common electrode 58 extending perpendicular to the common wiring 56 and spaced in parallel to each other, and spaced in parallel with the common electrode 58 between the common electrodes 58. The pixel electrode 72 is constituted.

3A and 3B, operation characteristics of the transverse electric field mode according to on / off of voltage will be described.

3A and 3B are diagrams illustrating operating characteristics of a liquid crystal positioned between a common electrode and a pixel electrode when voltages are in an off state and an on state, respectively.

As shown in FIG. 3A, when no voltage is applied between the common electrode 58 and the pixel electrode 72, the liquid crystal 90 maintains an initial arrangement state.

However, as shown in FIG. 3B, when a voltage is applied between the common electrode 58 and the pixel electrode 72, the horizontal electric field 95 is distributed between the two electrodes.

In this case, the liquid crystal 90 has a characteristic of moving in the distribution direction of the electric field 95 and is arranged at an angle with the direction of the electric field.

At this time, when liquid crystals are arranged in the direction of 45 degrees, the maximum transmittance | permeability characteristic is shown.

However, when a high voltage of a predetermined value or more is applied, the liquid crystal 90 becomes stronger to move in a direction parallel to the direction of the electric field 95, so that the liquid crystal 90 is arranged at 45 degrees or more. The phenomenon that the transmittance falls considerably occurs.

A description with reference to FIG. 4 is as follows.

FIG. 4 is a graph showing transmittance characteristics (V-T characteristics) in a voltage of a conventional transverse electric field type liquid crystal display device.                         

As shown, assuming that the maximum voltage that can be applied to the transverse electric field type liquid crystal panel is 10V, it shows the maximum transmittance characteristic when 6V, while the transmittance curve 99 suddenly drops when 6V is exceeded. have.

This means that when 6V or more is applied, the liquid crystal is arranged in parallel with the horizontal electric field so that the liquid crystal is arranged at 45 or more.

In such a case, the transmittance characteristic of the liquid crystal panel is inferior.

This will be described below with reference to FIG. 5.

5 is a graph showing a wide viewing angle characteristic of a conventional transverse electric field type liquid crystal display device.

As shown, it can be seen that the contrast characteristics are not symmetrical in the top, bottom, left and right of the liquid crystal panel.

That is, since they are arranged in one direction without being compensated with each other, it is seen that yellow shift and blue shift phenomena occur in up, down, left and right directions without showing stable wide viewing angle characteristics.

Such a phenomenon causes not only the wide viewing angle characteristic of the transverse electric field type liquid crystal display device to be significantly reduced but also a problem of degrading image quality.

SUMMARY OF THE INVENTION The present invention has been proposed for the purpose of solving the above-described problems, and has a common electrode and a pixel electrode in the lower and lower portions of the lower electrode and the lower electrode in the diagonal direction. The upper common electrode may be further configured on one surface of the corresponding upper substrate.

Such a configuration allows an electric field to be distributed at 45 degrees (or 135 degrees) between the common electrode and the pixel electrode, and further configures the common electrode on the upper substrate, thereby opening the region regardless of the distance between the common electrode and the pixel electrode. Since the luminance in the portion corresponding to the center of the region and in the region corresponding to the periphery of the opening region is almost the same, the liquid crystal array can be maintained uniformly 45 degrees (or 135 degrees) corresponding to the opening region even when a high voltage is applied. It is possible to maintain high transmittance characteristics and to realize high brightness.

In addition, since it is not necessary to separately configure a common wiring on the lower substrate, it is possible to implement a higher opening ratio than the conventional transverse electric field type liquid crystal display device.

In addition, the structure of the electrode described above divides one pixel into a plurality of regions, and the liquid crystals formed in each region are arranged in a symmetrical direction. Therefore, the color shift phenomenon can be prevented by the optical compensation characteristics.

In accordance with an aspect of the present invention, a transverse electric field type liquid crystal display device includes: a first substrate and a second substrate spaced apart from each other; A gate wiring extending in one direction on the first substrate; A data line crossing the gate line in a direction perpendicular to the pixel line to define a pixel area; A thin film transistor configured at an intersection point of the gate line and the data line; A plurality of common horizontal portions formed in the pixel area, the first common vertical portion and the second common vertical portion formed in parallel with the data line, and the first and second common vertical portions and ends thereof connected to and spaced apart from each other; A common electrode having a ladder shape; A plurality of pixel vertical portions positioned between the two components in parallel with the first and second common vertical portions in the pixel area and vertically intersecting with the pixel vertical portions and alternately arranged in parallel with the plurality of common horizontal portions; A pixel electrode composed of a pixel horizontal portion; An upper common electrode formed on one surface of the second substrate facing the first substrate, the upper common electrode having an identical shape overlapping the common electrode formed on the first substrate; The first common vertical part and the second common vertical part which are adjacent to each other with the data wires interposed therebetween are adjacent to each other, and a common connection part of which both ends thereof contact each other.

The pixel horizontal portion positioned at the top of the pixel region among the plurality of pixel horizontal portions of the pixel electrode is positioned above the gate wiring, so that the gate wiring is the first electrode and the pixel horizontal portion is the second electrode. The capacitor is configured.

The thin film transistor includes a gate electrode connected to the gate line, a source electrode connected to the data line, a drain electrode spaced apart from the source electrode by a predetermined distance, and a drain electrode connected to the pixel electrode.

The common electrode, the upper common electrode, and the pixel electrode are configured to be symmetrical to each other in a plane, thereby forming a square or a rectangle.

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Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Example

The array substrate for a transverse electric field type liquid crystal display device according to the present invention is configured such that the common electrode and the pixel electrode are symmetrically diagonally aligned with each other in a shape of "a" and "b" on the lower substrate, and the common electrode on the upper substrate. It is characterized by further comprising the same upper common electrode as.

Hereinafter, with reference to the drawings, the configuration of the array substrate according to the present invention will be described schematically.

6 and 7 are enlarged plan views schematically illustrating one pixel of a lower substrate and an upper substrate for a transverse electric field type liquid crystal display according to the present invention.

As shown in the drawing, the gate line 104 extending in one direction and the data line 120 defining the pixel area PA intersect the gate line 104 on one surface of the lower substrate 100.

One side of the pixel area PA includes a gate electrode 102, a semiconductor layer 112 on the gate electrode 102, and a source electrode 116 and a drain electrode spaced apart from each other on the semiconductor layer 112. 118 to form a thin film transistor (T).

In the pixel area PA, the common electrodes 106a, 106b and 108 and the pixel electrodes 126a and 126b are configured to be symmetrically diagonally aligned with each other in a "b" shape and a "b" shape, respectively.

This configuration divides the pixel area PA into a plurality of areas A1, A2, A3, A4, A5, A6, A7, and A8 in a square or rectangular shape.

The configuration of the common electrodes 106a, 106b and 108 and the pixel electrodes 126a and 126b will be described in more detail. The common electrodes 106a, 106b and 108 are positioned at both sides of the pixel area PA and the data wires. Vertical parts 106a and 106b configured in parallel with 120 and a plurality of horizontal parts 108 connecting the vertical parts.

The pixel electrodes 126a and 126b are disposed between the vertical portions 106a and 106b of the common electrodes 106a, 106b and 108 and vertically spaced apart from and parallel to the vertical portions 126a and the vertical portions 126a. And a horizontal portion 126b intersecting in the vertical direction.

The horizontal portions 126b of the pixel electrodes 126a and 126b are spaced apart from each other in parallel with the horizontal portions 108 of the common electrode.

In the above-described configuration, the common electrodes 106a, 106b, and 108 include a connection part c connected to the common electrodes of adjacent pixel regions (not shown). Therefore, the same common voltage flows to the entire surface of the liquid crystal panel.

In addition, the horizontal portion 126b of the pixel electrode is positioned above the gate wiring 104, and the horizontal portion 126b of the pixel electrode is the first electrode, and the lower gate wiring 102 is the second electrode. A storage capacitor C _ST serving as an electrode is formed.

As shown in FIG. 7, the upper common electrode 204a, 204b, and 206 having the same shape on one surface of the upper substrate 200 corresponding to the lower substrate 100 at the same position as the common electrodes 106a and 106b. ).                     

That is, the upper common electrodes 204a, 204b, and 206 may include two vertical parts 204a and 204b spaced in parallel and a plurality of horizontal parts 206 connecting the two vertical parts.

At this time, the common electrodes 106a, 106b and 108, the pixel electrodes 126a and 126b, and the upper common electrodes 204a, 204b and 206 formed in the lower substrate 100 correspond to each other. As described above, the pixel area PA is divided into a plurality of rectangular areas A1, A2, A3, A4, A5, A6, A7, and A8, and the electric field 300a generated in each area 300b is distributed in a shape symmetrical with respect to the horizontal portions 108 (and 206 and 126b) of the common electrode and the pixel electrode in the 45 degree and 135 degree directions.

Accordingly, due to the distribution of the electric fields 300a and 300b, a plurality of domains in which the arrangement directions of the liquid crystals are symmetric with each other may be formed in a single pixel.

Such a configuration can induce optical compensation to prevent defects such as color shift, thereby making it possible to manufacture a liquid crystal panel having a wide viewing angle characteristic of high quality.

In addition, the liquid crystal panel has a high transmittance even though a voltage of a predetermined voltage or more is applied by the configuration of the common electrodes 106a, 106b, 108, the pixel electrodes 126a, 126b, and the upper common electrodes 204a, 204b, 206. It is possible to maintain and obtain a uniform luminance distribution in the opening area.

Hereinafter, referring to FIGS. 8A and 8B, arrangement characteristics of the liquid crystal through the electrode structure according to the present invention will be described.                     

8A and 8B are diagrams showing operating characteristics of the liquid crystal when the voltages are turned off and on, respectively. (The upper common electrode is configured to correspond to the common electrode, but the configuration of the upper common electrode is omitted.)

As shown in FIG. 8A, the common electrodes 106a, 106b and 108 and the pixel electrodes 126a and 126b are symmetrically configured diagonally with each other in an "a" shape and a "b" shape, and voltage is applied thereto. If not, the liquid crystal 400 maintains an initial arrangement, but when voltage is applied as shown in FIG. 8B, an electric field is formed between the common electrodes 106a, 106b and 108 and the pixel electrodes 126a and 126b. (300a, 330b) is distributed, the liquid crystal is arranged in a direction parallel to the distribution direction of the electric field.

At this time, since the distribution directions of the electric fields 300a and 300b are distributed in the directions of 45 degrees and 135 degrees with respect to neighboring domains, the alignment direction of the liquid crystals is maintained at 45 degrees or 135 degrees no matter how high a voltage is applied.

Due to these characteristics, the liquid crystal panel according to the present invention can maintain a high transmittance characteristic unlike the prior art because the liquid crystal does not arrange more than 45 (or 135 degrees) even when a high voltage of a predetermined voltage or more is applied.

Further, by further configuring the upper common electrode on the upper substrate corresponding to the common electrode configured on the lower substrate, a uniform luminance distribution can be obtained in the opening region regardless of the distance between the common electrode and the pixel electrode. A transmittance of 80% or more can be obtained in the substrate.

The arrangement direction of the liquid crystal in each domain exhibiting the characteristics as described above and the transmittance characteristic thereof will be described in detail with reference to FIGS. 9 and 10.

FIG. 9 is a diagram illustrating a simulation result of arrangement of liquid crystals positioned in regions included in S of FIGS. 6 and 7, and FIG. 10 is cut along the line VII-VII of FIG. 9 and positioned in the cut region. It is sectional drawing which shows the arrangement state of a liquid crystal and its transmittance characteristic.

As shown in FIG. 9, the electric fields 300a and 300b distributed in the adjacent regions A1, A2, A3, and A4 in the up, down, left, and right directions are symmetrically distributed at 45 degrees and 135 degrees, respectively. It can be seen that the liquid crystal director 450 according to the distribution of the electric fields 300a and 300b is symmetrically distributed at 45 degrees and 135 degrees.

Therefore, the plurality of regions (A1, A2, A3, and A4 of FIG. 9) are arranged in directions in which they are symmetrical with each other, thereby preventing color shift through optical compensation.

In addition, by configuring the common electrode on the lower substrate and the upper substrate, the aperture region is uniformly distributed in the center and the periphery.

On the other hand, referring to FIG. 10, as shown in FIG. 10, the transmittance curve 350 shows the maximum at the openings A1 and A2 except the portions where the upper and lower common electrodes 204a and 106a are located. The liquid crystal director 450 is aligned horizontally with the inside of the openings A1 and A2 in close proximity to the upper and lower common electrodes 204a and 106a, so that the luminance difference in the openings is not severely displayed. .

This is related to the transmittance, and when the electrode structure according to the present invention is applied, the opening average transmittance of 80% or more was obtained.                     

Hereinafter, a manufacturing process of the array substrate for a transverse electric field type liquid crystal display device according to the present invention will be described with reference to FIGS. 11A to 11E and 12A to 12E.

As shown in FIGS. 11A and 12A, the switching area TA and the pixel area PA are defined on the substrate 100.

Next, aluminum (Al) and an aluminum-based metal including the same are deposited and patterned so as to be connected to the gate line 104 and the gate electrode 102 on one side of the pixel area PA and the gate electrode 102 in the switching area TA. ).

At the same time, common electrodes (106a in FIG. 6 and 106b and 108 in FIG. 6) are formed in the pixel area PA. The common electrode includes first and second vertical portions 106a and 106b positioned at both sides of the pixel area in a direction perpendicular to the gate line 104, and the first vertical portion 106a of FIG. 6. A second vertical portion (106b of FIG. 6) is connected to each other and composed of a plurality of horizontal portions 108 spaced apart in parallel by a predetermined interval.

In this case, the common electrodes 106a, 106b and 108 of FIG. 6 are formed to be connected to common electrodes (not shown) of neighboring pixel regions (not shown).

Forming the gate wiring 104 in an aluminum series is to prevent a signal delay by lowering a resistance, and in general, the aluminum-based metal is chemically and physically weak so that pin-hole or hillock ( Since defects such as hillock are likely to occur, a separate metal (chromium (Cr) or molybdenum (Mo)) is formed as a protective layer for protecting the same.

Next, as shown in FIGS. 11B and 12B, silicon oxide is formed on the entire surface of the substrate 100 on which the gate wiring 104, the gate electrode 102, and the common electrode (106a, 106b, and 108 of FIG. 6) are formed. The gate insulating layer 110 is formed by depositing one selected from the group of inorganic insulating materials including (SiO ₂ ) and silicon nitride (SiN _X ).

Subsequently, an amorphous silicon (a-Si: H) and an amorphous silicon (n + a-Si: H) including impurities are stacked on the gate insulating layer 110 and then patterned to form the gate electrode 102. An active layer 112 and an ohmic contact layer 114 are formed on the gate insulating layer 110 corresponding to the gate insulating layer 110.

Next, as illustrated in FIGS. 11C and 12C, chromium (Cr), molybdenum (Mo), and tungsten (W) are formed on the entire surface of the substrate 100 on which the active layer 112 and the ohmic contact layer 114 are formed. And depositing and patterning a metal selected from the group of conductive metals including titanium (Ti), copper (Cu), and the like, so as to be spaced apart from each other on the ohmic contact layer 112. 118 and a data line (120 of FIG. 6) connected to the source electrode 114 and crossing the gate line 104 in a vertical direction to define the pixel area PA.

As illustrated in FIGS. 11D and 12D, benzocyclobutene (BCB) and acryl based are formed on the entire surface of the substrate 100 on which the source and drain electrodes 116 and 118 and the data line 120 (FIG. 6) are formed. An organic insulating film having a low dielectric constant such as resin is coated to form the protective film 122, and then patterned to form a drain contact hole 124 exposing the drain electrode 118.                     

As shown in FIGS. 11E and 12E, a selected one of a transparent conductive metal group including indium tin oxide (ITO) and indium zinc oxide (IZO) is deposited on the passivation layer 122 and then patterned. As a result, a pixel electrode () contacting the drain electrode 118 is formed.

In this case, the pixel electrodes 126a and 126b of FIG. 6 are vertically intersected with the vertical portions 126a of FIG. 6 and perpendicular to the horizontal portions 108 of the common electrodes 106a, 106b and 108 of FIG. 6. It consists of the horizontal part 126b which cross | intersects (126a of FIG. 6) and spaced apart in parallel with the horizontal part 108 of the said common electrode.

At this time, the horizontal portion 126b of the pixel electrode is positioned above the gate wiring 104, the horizontal portion 126b of the pixel electrode is the first electrode, and the lower gate wiring 102 is the second electrode. A storage capacitor C _ST serving as an electrode is formed.

The common electrode and the pixel electrode configured as described above respectively define a plurality of quadrangular regions corresponding to the pixel area PA, and the common electrode and the pixel electrode in each region are diagonally formed in the "a" and "b" shapes. It is a symmetrical shape.

In this configuration, the electric field is distributed in 45 ° (or 135 °) directions in each area, and the adjacent areas A1, A2, A3, A4, and A are adjacent to the common electrode and the pixel electrode. For each of A5, A6, A7, and A8, the electric fields 300a and 300b of FIG. 6 are distributed with symmetry.

Therefore, when driving the liquid crystal, a plurality of domains are formed in each region in which liquid crystals are arranged in a symmetrical direction.

In the above-described configuration, since the electric field is distributed in the direction of 45 degrees (or 135 degrees) in the horizontal direction, it is not arranged at 45 degrees (or 135 degrees) or more even when a high voltage of a predetermined voltage or more is applied unlike the conventional art.

Therefore, it is possible to have stable transmittance characteristics with respect to voltage, and thus, there is an advantage in that stable image quality can be obtained, and a stable wide viewing angle can be realized because defects such as color shift do not occur.

In addition, by forming a common electrode having the same shape on the upper substrate in correspondence with the common electrode formed on the lower substrate, the transmittance is further improved without causing luminance unevenness within the opening region defined by the pixel electrode and the common electrode. There is this.

Therefore, the transverse electric field type liquid crystal display device including the array substrate for the transverse electric field type liquid crystal display device according to the present invention has the following effects.

First, the common electrode and the pixel electrode are formed in the "a" and "b" shape, and are configured to be symmetrical with each other in a diagonal direction, so that even when a high voltage is applied, the liquid crystal is not arranged at more than 45 degrees (or 135 degrees) to maintain high transmittance characteristics. It can be, the effect can be achieved high brightness.

Second, by further configuring the upper common electrode on the lower common electrode, since the electric field is strongly applied due to the effect of the effective electrode distance is closer, it is possible to design a wider distance between the electrodes, it is possible to implement a high opening ratio.

Third, the common electrode and the pixel electrode are configured in "a" and "b" shapes, thereby improving the response speed characteristics of the liquid crystal due to the strong electric field near the intersection of the common electrode and the pixel electrode.

Fourth, by forming a common electrode having the same shape on the upper substrate in correspondence with the common electrode formed on the lower substrate, it is possible to further improve the transmittance without generating luminance unevenness within the opening defined by the pixel electrode and the common electrode. have.

Fifth, since a plurality of regions in which the arrangement directions of liquid crystals are symmetrical to each other are configured in a single pixel, color shift phenomenon can be prevented due to optical compensation characteristics, thereby achieving a stable wide viewing angle.

Claims (6)

A first substrate and a second substrate configured to be spaced apart from each other; A gate wiring extending in one direction on the first substrate; A data line crossing the gate line in a direction perpendicular to the pixel line to define a pixel area; A thin film transistor configured at an intersection point of the gate line and the data line; A plurality of common horizontal portions formed in the pixel area, the first common vertical portion and the second common vertical portion formed in parallel with the data line, and the first and second common vertical portions and ends thereof connected to and spaced apart from each other; A common electrode having a ladder shape; A plurality of pixel vertical portions positioned between the two components in parallel with the first and second common vertical portions in the pixel area and vertically intersecting with the pixel vertical portions and alternately arranged in parallel with the plurality of common horizontal portions; A pixel electrode composed of a pixel horizontal portion; An upper common electrode formed on one surface of the second substrate facing the first substrate, the upper common electrode having an identical shape overlapping the common electrode formed on the first substrate; A common connection portion in which both ends of the first common vertical portion and the second common vertical portion are adjacent to each other, with the data lines interposed between neighboring pixel regions; Transverse electric field type liquid crystal display device comprising a. delete The method of claim 1, The pixel horizontal portion positioned at the top of the pixel region among the plurality of pixel horizontal portions of the pixel electrode is positioned above the gate wiring, so that the gate wiring is the first electrode and the pixel horizontal portion is the second electrode. A transverse electric field liquid crystal display device having a capacitor. The method of claim 1, And the thin film transistor includes a gate electrode connected to the gate wiring, a source electrode connected to the data wiring, and a drain electrode spaced apart from the source electrode at a predetermined interval and connected to the pixel electrode. The method of claim 1, The common electrode, the upper common electrode, and the pixel electrode are configured to be symmetrical to each other in a planar shape, so as to form a square or a rectangle. delete

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