KR100480813B1 - Multi-domain liquid crystal display device - Google Patents

Abstract

The multi-domain liquid crystal display device of the present invention includes a first substrate and a second substrate, a plurality of gate wirings formed in a first direction on the first substrate, and a second direction perpendicular to the first direction to form a pixel region. A plurality of data wirings to be defined, a plurality of thin film transistors formed at intersections of the gate wirings and the data wirings, and a common auxiliary including at least one independent electrode formed to surround the pixel area on the same layer as the gate wirings An electrode, a plurality of pixel electrodes formed to be connected to the thin film transistor in each pixel region, a storage electrode formed to overlap the gate wiring or the common auxiliary electrode, and at least one of the first and second substrates; And a liquid crystal layer formed between the first substrate and the second substrate.

Description

Multi-domain liquid crystal display device {MULTI-DOMAIN LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a multi-domain liquid crystal display device for distorting an electric field by forming a common auxiliary electrode to surround a pixel region in the same layer as a gate wiring. .

Recently, a liquid crystal display device for driving a liquid crystal by an auxiliary electrode electrically insulated from the pixel electrode without aligning the liquid crystal has been proposed. 1 is a cross-sectional view of a unit pixel of the conventional liquid crystal display device.

The conventional liquid crystal display device includes a first substrate and a second substrate, a plurality of data wirings and gate wirings formed vertically and horizontally on the first substrate to divide the first substrate into a plurality of pixel regions, and the pixel regions on the first substrate, respectively. A thin film transistor (TFT) formed at the gate electrode, a gate insulating film, a semiconductor layer, an ohmic contact layer, and a source / drain electrode, and a protective film 37 formed over the entire first substrate. And a pixel electrode 13 formed to be connected to the drain electrode on the passivation layer 37, and an auxiliary electrode 21 formed to overlap a portion of the pixel electrode 13 on the gate insulating layer.

A light blocking layer 25 for blocking light leaking from the gate wiring, the data wiring, and the thin film transistor on the second substrate, the color filter layer 23 formed on the light blocking layer 25, and the color filter layer ( 23 and a liquid crystal layer formed between the common electrode 17 and the first substrate and the second substrate.

The auxiliary electrode 21 formed around the pixel electrode 13 and the open area 27 of the common electrode 17 distort the electric field applied to the liquid crystal layer, thereby driving various liquid crystal molecules in the unit pixel. This means that when a voltage is applied to the liquid crystal display, the dielectric energy due to the distorted electric field places the liquid crystal director in a desired direction.

However, the liquid crystal display device requires an open area 27 in the common electrode 17 in order to obtain a multi-domain effect. For this purpose, a process of patterning the common electrode 17 in the manufacturing process of the liquid crystal display device is added. .

If the open area is not present or the width thereof is small, the degree of electric field distortion required for domain division is weak. Therefore, the time for reaching a stable state of the liquid crystal director is relatively long.

In addition, in the conventional liquid crystal display device, a storage electrode is formed on the gate wiring to maintain a voltage applied to the pixel electrode, but there is still little flicker due to the small capacitance formed between the gate wiring and the storage electrode. There is also a problem that appears.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art, and forms a common auxiliary electrode to surround a pixel region in the same layer as a gate wiring, and the common auxiliary electrode and / or the gate wiring and a common auxiliary electrode of a neighboring pixel. An object of the present invention is to provide a multi-domain liquid crystal display device in which a storage electrode is formed so as to overlap with each other to maintain proper capacitance, thereby preventing flicker, improving aperture ratio, and implementing a multi-domain effect.

The multi-domain liquid crystal display device of the present invention is the content corresponding to the invention described in the patent application No. 1999-05587 filed by the applicant of the present application, and common assistance so as to surround the pixel region with at least one independent electrode in the same layer as the gate wiring. An electrode is formed and the storage electrode is formed to overlap the common auxiliary electrode of the common auxiliary electrode and / or the gate wiring neighboring pixel.

In order to achieve the above object, a multi-domain liquid crystal display device according to an embodiment of the present invention, the first substrate and the second substrate, a plurality of gate wiring formed in the first direction on the first substrate and the first substrate A plurality of data lines formed in a second direction orthogonal to a direction to define a pixel area, a plurality of thin film transistors formed at an intersection of the gate line and the data line, and surrounding the pixel area on the same layer as the gate line; A common auxiliary electrode formed of at least one independent electrode, a plurality of pixel electrodes formed to be connected to the thin film transistor in each of the pixel regions, a storage electrode formed to overlap the gate wiring or the common auxiliary electrode; An alignment layer formed on at least one of the first and second substrates, and between the first and second substrates. Generated comprises a liquid crystal layer.

According to another exemplary embodiment of the present invention, a multi-domain liquid crystal display device includes a plurality of gate wirings and data wirings formed on a first substrate and a second substrate, vertically and horizontally on the first substrate to define a pixel area, and the gate. A common auxiliary electrode formed on the same layer as the wiring to surround the pixel area, a gate insulating film formed over the entire first substrate, a protective film formed over the first substrate over the gate insulating film, and integrated in the pixel region A storage electrode formed on the second substrate, a storage electrode formed on the second substrate, the storage electrode formed to be connected to the pixel electrode under the passivation layer, the storage electrode formed to overlap the common auxiliary electrode and the common auxiliary electrode surrounding the adjacent pixel region; A color filter layer formed on the second substrate between the light blocking layers, a common electrode formed on the second substrate including the color filter layer, and the first filter; And an alignment film formed on the plate and on at least one substrate of the second substrate, and comprises a liquid crystal layer formed between the first substrate and the second substrate.

The liquid crystal constituting the liquid crystal layer is a liquid crystal having positive or negative dielectric anisotropy, and the liquid crystal layer contains a chiral dopant.

Hereinafter, a multi-domain liquid crystal display device according to the present invention will be described in detail with reference to the drawings.

2A, 2B, and 2C are plan views of a multi-domain liquid crystal display device according to a first embodiment of the present invention, and FIG. 3 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along line II ′ of FIG. 2A. 4A, 4B, 4C and 4D are cross-sectional views of the multi-domain liquid crystal display device of the present invention taken along the line II-II 'of FIG. 2A, and FIG. 5 is the present invention taken along the line III-III' of FIG. 2A. 6 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention, FIG. 6 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along line IV-IV 'of FIG. 2A, and FIG. It is sectional drawing of the multidomain liquid crystal display element of this invention.

As shown in the drawing, the multi-domain liquid crystal display device of the present invention is formed vertically and horizontally on the first substrate 31 and the second substrate 33 and the first substrate so as to form a plurality of first substrates 31. A plurality of data lines 3 and gate lines 1 divided into pixel regions, a common auxiliary electrode 15 formed of at least one independent electrode on the same layer as the gate line 1 to distort an electric field, Thin films formed on each of the pixel regions on the first substrate 31 and composed of a gate electrode 11, a gate insulating film 35, a semiconductor layer 5, an ohmic contact layer 6, and source / drain electrodes 7 and 9. A transistor, a protective film 37 formed over the first substrate 31, and a pixel electrode 13 connected to the drain electrode 9 on the protective film 37 (see FIG. 3).

And a light shielding layer 25 for blocking light leaking from the gate wiring 1, the data wiring 3, and the thin film transistor on the second substrate 33, and the thin film transistor; A color filter layer 23 formed on the light shielding layer 25, a common electrode 17 formed on the color filter layer 23, and a liquid crystal layer formed between the first substrate and the second substrate. , 4a to 4d, 7)

31A to 31E are cross-sectional views illustrating a manufacturing process of the multi-domain liquid crystal display device of the present invention taken along the line X-X 'of FIG. 2C.

In order to manufacture a multi-domain liquid crystal display device having the above structure, first, a gate electrode 11, a gate insulating film 35, a semiconductor layer 5, an ohmic contact layer 6 and a source / A thin film transistor consisting of the drain electrodes 7 and 9 is formed. In this case, a plurality of gate wirings 1 and data wirings 3 which divide the first substrate into a plurality of pixel regions are formed. A manufacturing method of the multi-domain liquid crystal display device of the present invention will be described in detail with reference to the drawings. As shown in 31a, the gate electrode 11 and the gate wiring 1 are formed by stacking and patterning a metal made of Al, Mo, Cr, Ta, Al alloy, or a double layer thereof by a sputtering method. At the same time, the common auxiliary electrode 15 is formed so as to surround the pixel region. The common auxiliary electrode 15 is formed of at least one electrode in one pixel, and each electrode is independently driven. In addition, as shown in Figs. 2A and 5, the distance A between the common auxiliary electrodes in the connection portion with the neighboring pixels may be 7 m or less, preferably 4 m to 7 m.

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When the common auxiliary electrode 15 is formed using the same material as the gate wiring 1, the common auxiliary electrode 15 is formed on the same layer as the gate wiring 1 with the same mask to be electrically connected to the common electrode 17. Alternatively, additional masks may be used to form different metals, or different double layers.

As shown in FIG. 31B, a gate insulating film 35 is deposited on the gate electrode 11, the common auxiliary electrode 15, and the gate wiring 1 by SiN _X or SiO _X by PECVD. Subsequently, the semiconductor layer 5 and the ohmic contact layer 6 respectively a-Si and n ⁺ a-Si are laminated by PECVD (Plasma Enhanced Chemical Vapor Deposition) method, and then the a-Si and n ⁺ a- It is formed by patterning Si.

In another method, SiN _X or SiO _X , a-Si, and n ⁺ a-Si are sequentially stacked to form a gate insulating film 35, and a-Si and n ⁺ a-Si are patterned to form a semiconductor layer ( 5) and the ohmic contact layer 6 are formed.

As shown in FIG. 31C, a metal including Al, Mo, Cr, Ta, or an Al alloy, or a double layer thereof is laminated by a sputtering method, and then patterned to form data wirings 3 and source / drain electrodes 7 and 9. . In this case, the storage electrode 43 is formed simultaneously so as to overlap the gate wiring 1, the common auxiliary electrode 15, and / or the common auxiliary electrode 15 of the neighboring pixel, and the storage electrode 43 is formed as described above. The gate wiring 1 and / or the common auxiliary electrode 15 serve as a storage capacitor.

As shown in FIG. 31D, the protective film 37 is formed of a material such as BCB (BenzoCycloButene), acrylic resin, polyimide compound, SiN _X or SiO _X over the first substrate 31. As shown in FIG. 31E, an ITO (indium tin oxide) is stacked by a sputtering method and then patterned to form a pixel electrode 13.

At this time, the pixel electrode 13 has a portion where the storage electrode 43 extends and overlaps, and the contact hole 39 is formed by removing the passivation layer 37 under the overlapping region. 43) is electrically connected. In addition, the protective layer 37 on the drain electrode 9 is selectively removed to form a contact hole 39 in the same manner, and is connected to the drain electrode 9 through the contact hole 39.

In addition, an alignment layer (not shown) may be formed on the pixel electrode 13.

The light blocking layer 25 is formed on the second substrate 33, and the color filter layer 23 is formed such that R, G, and B (red, green, blue) elements are repeated for each pixel. Subsequently, the common electrode 17 is formed of a transparent electrode such as ITO, like the pixel electrode 13, and a photosensitive material is stacked on the common electrode 17, and then patterned by photolithography to form various shapes. Dielectric structure 53 is formed (see FIGS. 4A and 4B).

In addition, an alignment layer (not shown) may be formed on the dielectric structure 53.

The liquid crystal is injected between the first substrate 31 and the second substrate 33 to complete a multi-domain liquid crystal display device. The liquid crystal constituting the liquid crystal layer may use a liquid crystal having positive or negative dielectric anisotropy, and may include a chiral dopant.

The material constituting the dielectric structure 53 preferably has a dielectric constant equal to or less than the dielectric constant of the liquid crystal layer, and preferably 3 or less, and includes a material such as acrylic (photoacrylate) or BCB (BenzoCycloButene). Can be.

The voltage V _com is applied to the common auxiliary electrode 15 by forming Ag-Dotting portions at each corner of the driving region of the liquid crystal display device on the first substrate 31. An electric field is applied to drive the liquid crystal by the vertical potential difference. The Ag-Dotting portion of each corner and the common auxiliary electrode 15 are connected to apply a voltage V _com . This process is performed simultaneously with forming the common auxiliary electrode 15.

In addition, in the multi-domain liquid crystal display device of the present invention, a polymer is stretched on at least one of the first substrate 31 and the second substrate 33 to form a retardation film 29.

The retardation film 29 is a negative uniaxial film, which is formed of a uniaxial material having one optical axis, and compensates for a phase difference felt by a user in a direction perpendicular to the substrate and a change in viewing angle. do. Accordingly, the viewing angle in the left and right directions can be more effectively compensated by widening the region without gray inversion, increasing the contrast ratio in the oblique direction, and forming one pixel in a multi-domain.

In the multi-domain liquid crystal display device of the present invention, in addition to the negative uniaxial film, a negative biaxial film may be formed as the retardation film 29, and a voice composed of a biaxial material having two optical axes may be used. The layered film may obtain a wider viewing angle than the uniaxial film.

After attaching the retardation film 29, a polarizer (not shown) is attached to both substrates 31 and 33, wherein the polarizer is integrally formed with the retardation film 29. Can be attached.

In the multi-domain liquid crystal display device of the present invention, the pixel electrode 13 is formed to overlap with the common auxiliary electrode 15, and the light blocking layer 25 also overlaps with the common auxiliary electrode 15, so that the aperture ratio is high, and the storage is performed. The electrode 43 overlaps the gate wiring 1 and / or the common auxiliary electrode 15 to form a storage capacitor.

In the multi-domain liquid crystal display device shown in FIG. 2A, two common auxiliary electrodes 15 driven independently in one pixel are formed to surround the pixel region, and each common auxiliary electrode 15 is a common auxiliary electrode of neighboring pixels. It is connected to the electrode and a part of the connection. That is, the common auxiliary electrode 15 surrounding the pixel area is formed to have an opening. In addition, the storage electrode 43 is formed to overlap the common auxiliary electrode 15 and the gate wiring 1 to secure the storage capacitor.

In the multi-domain liquid crystal display device shown in FIG. 2B, the common auxiliary electrode 15 having the same structure as the common auxiliary electrode 15 of FIG. 2A is formed, and the common auxiliary electrode 15, the gate wiring 1, and The storage electrode 43 is formed to overlap with the common auxiliary electrode 15 of the neighboring pixel to secure a further extended storage capacitor.

The multi-domain liquid crystal display device shown in FIG. 2C forms a common auxiliary electrode 15 having the same structure as the common auxiliary electrode of FIG. 2A and overlaps the common auxiliary electrode 15 and the common auxiliary electrode of the neighboring pixel. The storage electrode 43 is formed to secure the storage capacitor, thereby eliminating a signal delay phenomenon in the wiring generated when the storage electrode 43 is formed to overlap the gate wiring 1.

8A, 8B and 8C are plan views of the multi-domain liquid crystal display device according to the second embodiment of the present invention, and FIGS. 9A, 9B and 9C are plan views of the multi-domain liquid crystal display device according to the third embodiment of the present invention. 10A, 10B, and 10C are plan views of a multi-domain liquid crystal display device according to a fourth embodiment of the present invention, and FIGS. 11A, 11B, and 11C are multi-domain liquid crystal display devices according to a fifth embodiment of the present invention. 12A, 12B, and 12C are plan views of a multi-domain liquid crystal display device according to a sixth embodiment of the present invention, and FIGS. 13A and 13B illustrate a multi-domain liquid crystal display device according to a seventh embodiment of the present invention. Top view.

In the multi-domain liquid crystal display device shown in FIGS. 8A to 8C, two common auxiliary poles 15 independently driven within one pixel are formed so as to surround the pixel region, and each common auxiliary electrode 15 is adjacent to the pixel. Is connected to the common auxiliary electrode of the part different from the common auxiliary electrode shown in FIGS. 2A to 2C. In each case, the common auxiliary electrode 15 and the gate wiring 1 overlap each other (FIG. 8A), the gate wiring 1, the common auxiliary electrode 15, and the common auxiliary electrode of the neighboring pixel. 8B, the storage electrode 43 is formed to overlap the common auxiliary electrode 15 and the common auxiliary electrode of the neighboring pixel (FIG. 8C) to secure the storage capacitor.

In the multi-domain liquid crystal display device shown in Figs. 9A to 9C, two common auxiliary electrodes 15 driven independently in one pixel are formed to surround the pixel region, and each common auxiliary electrode 15 is formed of a neighboring pixel. The common auxiliary electrode is connected to the connection part formed on the gate wiring 1 side. In each case, the common auxiliary electrode 15 and the gate wiring 1 overlap (FIG. 9A), the gate wiring 1, the common auxiliary electrode 15, and the common auxiliary electrode of the neighboring pixel. 9B, the storage electrode 43 is formed to overlap the common auxiliary electrode 15 and the common auxiliary electrode of the neighboring pixel (FIG. 9C) to secure the storage capacitor.

In the multi-domain liquid crystal display device shown in Figs. 10A to 10C, two common auxiliary electrodes 15 driven independently in one pixel are formed to surround the pixel region, and each common auxiliary electrode 15 is formed of a neighboring pixel. The common auxiliary electrode is connected to the gate wiring 1 side and the common auxiliary electrode 15, respectively, and is connected through a connection part formed to cross the pixel region in the direction of the gate wiring 1. Further, the common auxiliary electrode 15 and the gate wiring 1 overlap (FIG. 10A), the gate wiring 1, the common auxiliary electrode 15, and the common auxiliary electrode of the neighboring pixel (FIG. 10B). In addition, the storage electrode 43 is formed to overlap the common auxiliary electrode 15 and the common auxiliary electrode of the neighboring pixel (FIG. 10C) to secure the storage capacitor.

In the multi-domain liquid crystal display device shown in Figs. 11A to 11C, two common auxiliary electrodes 15 are formed so as to surround the pixel region in one pixel, and the common auxiliary electrodes 15 are formed with the common auxiliary electrodes of neighboring pixels. Each of the connecting portions formed in the direction of the gate wiring 1 is connected to each other, and two parallel connecting portions formed in the direction of the gate wiring 1 are further provided at the portion of the data wiring 3 formed on one side of the pixel to be connected to each other. This results in the same effect that the common auxiliary electrode 15 is formed of one common auxiliary electrode 15, but two electrodes are formed in one pixel. In addition, in each case, the common auxiliary electrode 15 and the gate wiring 1 overlap (FIG. 11A), or the gate wiring 1, the common auxiliary electrode 15, and the common auxiliary electrode of the neighboring pixel. 11B), the storage electrode 43 is formed to overlap the common auxiliary electrode 15 and the common auxiliary electrode of the neighboring pixel (FIG. 11C) to secure the storage capacitor.

In the multi-domain liquid crystal display device shown in Figs. 12A to 12C, two common auxiliary electrodes 15 are formed so as to surround the pixel region in one pixel, and the common auxiliary electrodes 15 are formed with the common auxiliary electrodes of neighboring pixels. Each connecting portion formed in the direction of the gate wiring 1 across each pixel, and two parallel connecting portions formed in the direction of the gate wiring 1 further include a connecting portion at the data wiring 3 forming portions on both sides of the pixel. Finally, one common auxiliary electrode 15 or two electrodes are formed in one pixel. In each case, the common auxiliary electrode 15 and the gate wiring 1 overlap each other (FIG. 12A), the gate wiring 1, the common auxiliary electrode 15, and the common auxiliary electrode of the neighboring pixel. 12B, the storage electrode 43 is formed to overlap the common auxiliary electrode 15 and the common auxiliary electrode of the neighboring pixel (FIG. 12C) to secure the storage capacitor.

In the multi-domain liquid crystal display device shown in Figs. 13A to 13B, one common auxiliary electrode 15 is formed so as to surround the pixel region in one pixel, and the common auxiliary electrode 15 is formed of a common auxiliary electrode of a neighboring pixel. Connected. In other words, the common auxiliary electrode 15 surrounding the pixel region is formed without openings. The common auxiliary electrode 15 overlaps with the gate wiring 1, the common auxiliary electrode 15, and the common auxiliary electrode of neighboring pixels (FIG. 13A). ), The storage electrode 43 is formed to overlap the common auxiliary electrode 15 and the common auxiliary electrode of the neighboring pixel (FIG. 13B) to secure the storage capacitor.

4A and 4B illustrate embodiments in which a dielectric structure 53 is formed on the common electrode 17, and FIGS. 4C and 4D illustrate embodiments in which an electric field induction window 51 is formed in the common electrode 17. 4A and 4C illustrate embodiments in which the protective layer 37 is formed of a material such as SiN _X or SiO _X. FIGS. 4B and 4D illustrate BCB (BenzoCycloButene), acrylic resin, or polyimide. It is the Example formed with the compound.

14 is a plan view of a multi-domain liquid crystal display device according to an eighth embodiment of the present invention, FIG. 16 is a plan view of a multi-domain liquid crystal display device according to a ninth embodiment of the present invention, and FIG. 17 is a tenth embodiment of the present invention. 18 is a plan view of a multi-domain liquid crystal display device according to an embodiment, FIG. 18 is a plan view of a multi-domain liquid crystal display device according to an eleventh embodiment of the present invention, and FIG. 19 is a multi-domain liquid crystal display according to a twelfth embodiment of the present invention. 20 is a plan view of a multi-domain liquid crystal display device according to a thirteenth embodiment of the present invention, and FIG. 15 is a plan view of the multi-domain liquid crystal display device of the present invention according to line VI-VI 'of FIG. It is a cross section.

The multi-domain liquid crystal display elements shown in the eighth to thirteenth embodiments of the present invention have the same structure except that the storage electrodes are not formed in the liquid crystal display elements shown in the first to sixth embodiments. That is, the pixel electrode 13 overlaps the common auxiliary electrode 15 to form a storage capacitor, and the light blocking layer 25 overlaps the common auxiliary electrode 15. Same as 6. 15 shows a structure without a storage electrode.

21A, 21B, and 21C are plan views of a multi-domain liquid crystal display device according to a fourteenth embodiment of the present invention, and FIGS. 25A, 25B, and 25C are plan views of a multi-domain liquid crystal display device according to a fifteenth embodiment of the present invention. 26A, 26B, and 26C are plan views of a multi-domain liquid crystal display device according to a sixteenth embodiment of the present invention, and FIGS. 27A, 27B and 27C are multi-domain liquid crystal display devices according to a seventeenth embodiment of the present invention. 28A, 28B, and 28C are plan views of a multi-domain liquid crystal display device according to an eighteenth embodiment of the present invention, and FIGS. 29A, 29B, and 29C are multi-domain liquid crystals according to a nineteenth embodiment of the present invention. 30A and 30B are plan views of a multi-domain liquid crystal display device according to a twentieth embodiment of the present invention. 22 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along the line VII-VII 'of FIG. 21A, and FIGS. 23A, 23B, 23C, and 23D are taken along the line VIII-VIII' of FIG. 21A. It is sectional drawing of the multidomain liquid crystal display element of this invention, and FIG. 24 is sectional drawing of the multidomain liquid crystal display element of this invention along the IX-IX 'line | wire of said FIG.

In the multi-domain liquid crystal display device shown in Embodiments 14 to 20 of the present invention, in the liquid crystal display device shown in Embodiments 1 to 6, the pixel electrode 13 does not overlap the common auxiliary electrode 15, and the light shielding layer Except that 25 is overlapped with the pixel electrode 13, they are all the same structure.

FIG. 22 illustrates a structure in which the storage electrode 43 is formed by overlapping the common auxiliary electrode 15 and the gate wiring 1 so as to function as the storage electrode 43. FIG. 24 illustrates the storage electrode 43 so as to overlap the gate wiring 1, the common auxiliary electrode 15, and the common auxiliary electrode of the neighboring pixel, or overlap the common auxiliary electrode 15 and the common auxiliary electrode of the neighboring pixel. It shows the structure to form a storage capacitor by forming.

23A and 23B illustrate embodiments in which a dielectric structure 53 is formed on the common electrode 17, and FIGS. 23C and 23D illustrate embodiments in which an electric field induction window 51 is formed in the common electrode 17. 23A and 23C illustrate embodiments in which the protective film 37 is formed of a material such as SiN _X or SiO _X. FIGS. 23B and 23D illustrate BCB (BenzoCycloButene), acrylic resin, or polyimide. It is the Example formed and flattened by the compound.

Embodiments of the multi-domain liquid crystal display device of the present invention are a high-throughput L-lined thin film transistor structure, wherein the L-shaped TFT is formed by forming a TFT in the L-shape on the gate wiring 1, Compared to the liquid crystal display device, the aperture ratio is improved, and parasitic capacitors generated between the gate wiring 1 and the drain electrode 9 can be reduced.

32A to 32G illustrate various electric field induction windows 51 or dielectric structures 53 according to an embodiment of the present invention. In the multi-domain liquid crystal display device of the present invention, a dielectric structure 53 is formed on the pixel electrode 13 and / or the common electrode 17, or the pixel electrode 13, the protective film 37, and the gate insulating film ( 35, by patterning the color filter layer 23, overcoat layer (not shown) and / or common electrode 17, thereby forming an electric field induction window 51 such as a hole or slit. Implement field distortion effects and multidomains.

The field induction window 51 or the dielectric structure 53 is long, patterned horizontally, vertically, and diagonally so as to divide into two domains, or have an X shape, a + shape, a ◇ shape, a comb shape, and a double shape. The effect of dividing the Y (Fig. 32G) shape and the X and + shapes into four domains and multi-domains simultaneously is realized, and is formed on at least one of the first and second substrates 31 and 33. It is also possible to apply the two substrates 31 and 33 independently or in combination.

In addition, the multi-domain liquid crystal display device of the present invention forms an alignment film (not shown) over the entirety of the first substrate 31 and / or the second substrate 33. At this time, a material such as polyamide or polyimide compound, PVA (polyvinylalcohol), polyamic acid or SiO ₂ is used as the alignment material constituting the alignment film, and a rubbing method is used. In order to determine the orientation direction, any material can be applied as long as it is a material suitable for other rubbing treatment.

In addition, the alignment layer may be formed of a material having photoreactivity, that is, a material such as PVCN (polyvinylcinnamate), PSCN (polysiloxanecinnamate), or CelCN (cellulosecinnamate) -based compound to form an optical alignment layer, and other optical alignment treatment Any suitable material can be applied. The photoalignment layer is irradiated with light at least once to determine the pretilt angle and alignment direction or pretilt direction of the liquid crystal molecules at the same time, thereby resulting in alignment of the liquid crystal. Secure stability As for the light used for the optical alignment, light in the ultraviolet region is suitable, and any light among non-polarized light, linearly polarized light, and partially polarized light may be used.

In addition, the rubbing method or the photo-alignment method may be applied only to any one of the first substrate 31 or the second substrate 33, or may be processed on both substrates, or different alignment treatments may be performed on both substrates, or an alignment film may be used. It is also possible to form only and not perform an orientation treatment.

In addition, by performing the alignment process, a multi-domain liquid crystal display device divided into at least two regions may be formed so that the liquid crystal molecules of the liquid crystal layer may be differently aligned on each region. That is, the multi-domain effect is realized by dividing each pixel into four regions, such as + or × characters, or by dividing them into horizontal, vertical, or diagonal lines, and by forming different alignment processes or orientation directions in each region and on each substrate. do. At least one of the divided regions may be a non-oriented region, and the entire region may be a non-oriented region.

The multi-domain liquid crystal display of the present invention forms a common auxiliary electrode made of at least one electrode on the same layer as the gate wiring and surrounds the pixel region, and the common wiring of the gate wiring and / or the common auxiliary electrode and neighboring pixels. Forming a storage electrode so as to overlap the electrode has the effect of maintaining the proper capacitance, improve the viewing angle, improve the aperture ratio and maximize the multi-domain effect.

In addition, it is possible to eliminate flicker on the screen as well as to improve image quality due to the extended storage capacitor. Since the common auxiliary electrode is on the same layer as the gate wiring, the short between the pixel electrode and the common auxiliary electrode is prevented. The yield can be improved.

1 is a cross-sectional view of a conventional liquid crystal display device.

2A, 2B, and 2C are plan views of a multi-domain liquid crystal display device according to a first embodiment of the present invention.

3 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along the line II ′ of FIG. 2A.

4A, 4B, 4C, and 4D are cross-sectional views of the multi-domain liquid crystal display device of the present invention taken along the line II-II 'of FIG. 2A.

5 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along line III-III 'of FIG. 2A.

6 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along the line IV-IV 'of FIG. 2A.

7 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along the line VV ′ of FIG. 2B.

8A, 8B, and 8C are plan views of a multi-domain liquid crystal display device according to a second embodiment of the present invention.

9A, 9B, and 9C are plan views of a multi-domain liquid crystal display device according to a third embodiment of the present invention.

10A, 10B, and 10C are plan views of a multi-domain liquid crystal display device according to a fourth embodiment of the present invention.

11A, 11B, and 11C are plan views of a multi-domain liquid crystal display device according to a fifth embodiment of the present invention.

12A, 12B, and 12C are plan views of a multi-domain liquid crystal display device according to a sixth embodiment of the present invention.

13A and 13B are plan views of a multi-domain liquid crystal display device according to a seventh embodiment of the present invention.

14 is a plan view of a multi-domain liquid crystal display device according to an eighth embodiment of the present invention.

15 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along the line VI-VI 'of FIG. 14;

16 is a plan view of a multi-domain liquid crystal display device according to a ninth embodiment of the present invention.

17 is a plan view of a multi-domain liquid crystal display device according to a tenth embodiment of the present invention.

18 is a plan view of a multi-domain liquid crystal display device according to an eleventh embodiment of the present invention.

19 is a plan view of a multi-domain liquid crystal display device according to a twelfth embodiment of the present invention.

20 is a plan view of a multi-domain liquid crystal display device according to a thirteenth embodiment of the present invention.

21A, 21B, and 21C are plan views of a multi-domain liquid crystal display device according to a fourteenth embodiment of the present invention.

FIG. 22 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along the line VII-VII ′ of FIG. 21A.

23A, 23B, 23C, and 23D are cross-sectional views of the multi-domain liquid crystal display device of the present invention taken along the line VIII-VIII 'of FIG. 21A.

Fig. 24 is a cross-sectional view of the multi-domain liquid crystal display device of the present invention taken along the line IX-IX 'of Fig. 21B.

25A, 25B, and 25C are plan views of a multi-domain liquid crystal display device according to a fifteenth embodiment of the present invention.

26A, 26B, and 26C are plan views of a multi-domain liquid crystal display device according to a sixteenth embodiment of the present invention.

27A, 27B, and 27C are plan views of the multi-domain liquid crystal display device according to the seventeenth embodiment of the present invention.

28A, 28B, and 28C are plan views of a multi-domain liquid crystal display device according to an eighteenth embodiment of the present invention.

29A, 29B, and 29C are plan views of a multi-domain liquid crystal display device according to a nineteenth embodiment of the present invention.

30A and 30B are plan views of a multi-domain liquid crystal display device according to a twentieth embodiment of the present invention.

31A to 31E are sectional views showing the manufacturing process of the multi-domain liquid crystal display device of the present invention taken along the line X-X 'of FIG. 2C.

32A to 32G illustrate various electric field induction windows or dielectric structures of a multi-domain liquid crystal display device according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: gate wiring 3: data wiring

5: semiconductor layer 6: ohmic contact layer

7 source electrode 9 drain electrode

11 gate electrode 13 pixel electrode

15: common auxiliary electrode 17: common electrode

21: auxiliary electrode 23: color filter layer

25: shading layer 27: open area

29: retardation film 31: the first substrate

33: second substrate 35: gate insulating film

37: shield 39: contact hole

43: storage electrode 51: field induction window (hole or slit)

53: dielectric structure

Claims (13)

A first substrate and a second substrate, A plurality of gate wirings formed in a first direction on the first substrate and a plurality of data wirings formed in a second direction perpendicular to the first direction to define a pixel region; A plurality of thin film transistors formed at intersections of the gate and data lines; A common auxiliary electrode formed on the same layer as the gate wiring so as to surround the pixel area, and having at least one independent electrode; A plurality of pixel electrodes formed to be connected to the thin film transistors in the respective pixel regions; A storage electrode formed to overlap the gate wiring or the common auxiliary electrode; An alignment layer formed on at least one of the first substrate and the second substrate, and And a liquid crystal layer formed between the first substrate and the second substrate. The multi-domain liquid crystal display of claim 1, wherein the common auxiliary electrode has a first connection part connected to the common auxiliary electrode of a pixel area adjacent to the pixel area in the first direction. The multi-domain liquid crystal display device of claim 2, wherein the first connection part has a second connection part connected in the second direction. The multi-domain liquid crystal display of claim 2, wherein the common auxiliary electrode has a protrusion perpendicular to the first connection portion. The multi-domain liquid crystal display of claim 1, wherein the pixel electrode overlaps with the common auxiliary electrode. The multi-domain liquid crystal display device of claim 1, wherein the pixel electrode does not overlap the common auxiliary electrode. The multi-domain liquid crystal display of claim 1, wherein the storage electrode is formed to overlap the gate wiring. The multi-domain liquid crystal display of claim 1, wherein the storage electrode is formed to overlap the common auxiliary electrode. The multi-domain liquid crystal display device of claim 1, wherein the storage electrode overlaps the common auxiliary electrode of the pixel area and the pixel area adjacent to the second direction. The multi-domain liquid crystal display of claim 1, wherein the pixel region is divided into at least two regions so that liquid crystal molecules of the liquid crystal layer exhibit different driving characteristics on each region. The multi-domain liquid crystal display device according to claim 1, wherein the alignment film is divided into at least two regions so that liquid crystal molecules of the liquid crystal layer exhibit different alignment characteristics on each region. A first substrate and a second substrate, A plurality of gate wirings and data wirings formed on the first substrate in a lengthwise and horizontal direction defining a pixel region; A common auxiliary electrode formed on the same layer as the gate wiring so as to surround the pixel area; A gate insulating film formed over the entire surface of the first substrate; A protective film formed over the entire first substrate on the gate insulating film; A pixel electrode integrally formed in the pixel region; A storage electrode connected to the pixel electrode under the passivation layer and overlapping with the common auxiliary electrode and the common auxiliary electrode surrounding the adjacent pixel region; A light blocking layer formed on the second substrate; A color filter layer formed on the second substrate between the light blocking layers; A common electrode formed on the second substrate including the color filter layer; An alignment layer formed on at least one of the first substrate and the second substrate, and And a liquid crystal layer formed between the first substrate and the second substrate. The multi-domain liquid crystal display of claim 12, wherein the light blocking layer overlaps the common auxiliary electrode.