KR100864923B1 - Multi-domain liquid crystal display device and method for fabricating the same - Google Patents

Abstract

The present invention relates to a multi-domain liquid crystal display device and a method for manufacturing the same, which can simplify the manufacturing process, comprising: a first substrate and a second substrate; A plurality of gate lines and data lines formed vertically and horizontally on the first substrate to define pixel regions; A passivation layer formed on an entire surface of the first substrate including the data line and the gate line and formed to have an inclined surface at an edge of the pixel area; A pixel electrode formed in the pixel region on the passivation layer; A color filter layer formed on the second substrate; A common electrode formed on the color filter layer; And a liquid crystal layer formed between the first substrate and the second substrate, wherein the passivation layer includes a passivation layer protrusion having an inclined surface at the center of the pixel area.

Protective film, pixel electrode

Description

MULTI-DOMAIN LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR FABRICATING THE SAME

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

2 is a plan view illustrating unit pixels of a multi-domain liquid crystal display device according to a first exemplary embodiment of the present invention.

3A and 3B are cross-sectional views taken along line A-A 'and B-B' of FIG. 2, respectively.

4 is a plan view illustrating unit pixels of a multi-domain liquid crystal display according to a second exemplary embodiment of the present invention.

5A and 5B are cross sectional views taken along the line A-A 'and B-B' of FIG. 4, respectively.

6 is a plan view illustrating unit pixels of a multi-domain liquid crystal display according to a third exemplary embodiment of the present invention.

7A-7B are cross-sectional views taken along the line A-A 'and B-B' of FIG. 6, respectively.

<Description of main parts of drawing>

10: first substrate 11: gate insulating film

12: gate wiring 13: data wiring

14: protective film 15: pixel electrode

20: second substrate 21: light shielding layer

22: color filter layer 23: common electrode                 

24: dielectric structure

The present invention relates to a liquid crystal display device, and more particularly, to a multi-domain liquid crystal display device and a method of manufacturing the same that can simplify the manufacturing process.

In general, a liquid crystal display device is composed of a lower substrate and an upper substrate facing each other at a predetermined interval, and a liquid crystal layer formed between the two substrates.

Among the liquid crystal display devices, the vertical alignment mode liquid crystal display device uses a negative liquid crystal having a negative dielectric anisotropy. In a state where no voltage is applied, the long axis direction of the liquid crystal molecules is perpendicular to the alignment layer plane. When the voltage is applied, the liquid crystal molecules are oriented obliquely by the electric field. That is, an image is displayed by adjusting the transmittance of light by using the property oriented by an electric field.

Meanwhile, in the vertical alignment mode, in order to realize a wide viewing angle, an auxiliary electrode, a rib, or a slit is formed on a substrate to distort the electric field applied to the liquid crystal layer, thereby directing the director of the liquid crystal molecules in a desired direction. Positioning methods are proposed, for example, patterned vertical alignment (PVA), multi-domain vertical alignment (MVA), and the like.

Hereinafter, a conventional liquid crystal display device will be described with reference to the accompanying drawings.                         

1 is a cross-sectional view of a unit pixel of a conventional liquid crystal display device for driving a liquid crystal by projections and slits, the conventional liquid crystal display device comprising: a first substrate and a second substrate (not shown); A plurality of gate lines and data lines (not shown) formed vertically and horizontally on the first substrate to define pixel regions; A thin film transistor (not shown) formed in the pixel region and composed of a gate electrode, a gate insulating film, a semiconductor layer, an ohmic contact layer, and a source / drain electrode; A pixel electrode (1) formed in the pixel region and having an electric field induction window (2) therein; A protective film 4 formed under the pixel electrode 1; A light blocking layer (not shown) formed on the second substrate to block light leaking from the gate wiring, the data wiring, and the thin film transistor; A color filter layer 7 formed on the light blocking layer; A common electrode 9 formed on the color filter layer 7; A dielectric structure 6 formed on the common electrode 9; And a liquid crystal layer (not shown) formed between the first substrate and the second substrate.

The conventional liquid crystal display device distorts the electric field applied to the liquid crystal layer by the action of the electric field induction window 2 and the dielectric structure 6. Therefore, the dielectric energy is positioned in the desired direction by the distorted electric field, thereby driving the liquid crystal molecules in the unit pixel in various ways to implement a multi-domain effect.

However, the conventional liquid crystal display device requires a patterning process for forming the electric field guide window 2 on the pixel electrode 1, and also requires a dielectric structure 6 to be complicated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a multi-domain liquid crystal display device and a method for manufacturing the same, which can simplify the manufacturing process by implementing a multi-domain without an electric field induction window or a dielectric structure on the lower substrate. will be.

Multi-domain liquid crystal display device of the present invention for achieving the above object is a first substrate and a second substrate; A plurality of gate lines and data lines formed vertically and horizontally on the first substrate to define pixel regions; A passivation layer formed on an entire surface of the first substrate including the data line and formed to have an inclined surface at an edge of the pixel region; A pixel electrode formed in the pixel area on the passivation layer; A color filter layer formed on the second substrate; A common electrode formed on the color filter layer; It comprises a liquid crystal layer formed between the first substrate and the second substrate.
Method of manufacturing a multi-domain liquid crystal display device of the present invention for achieving the above object comprises the steps of providing a first substrate and a second substrate; Forming a plurality of gate lines and data lines formed on the first substrate in a length and width direction to define pixel regions; Forming a passivation layer formed on an entire surface of the first substrate including the data line and having an inclined surface at an edge of the pixel region; Forming a pixel electrode in the pixel area on the passivation layer; Forming a color filter layer on the second substrate; Forming a common electrode on the color filter layer; And forming a liquid crystal layer between the first substrate and the second substrate.

In addition, a dielectric structure may be further formed on the common electrode or an inclined surface may be formed in the center of the pixel electrode in order to improve response speed and realize stable texture. Here, the center of the pixel electrode is formed to serve as a projection by a protective film having an inclined surface.

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

First embodiment

FIG. 2 is a plan view of a unit pixel of a multi-domain liquid crystal display device according to a first exemplary embodiment of the present invention, FIG. 3A is a cross-sectional view taken along the line AA ′ of FIG. 2, and FIG. 3B is a cross-sectional view taken along the line B-B ′ of FIG. 2.

A first embodiment of the present invention includes a first substrate 10 and a second substrate 20; A plurality of gate lines 12 and data lines 13 formed on the first substrate 10 in a length and width direction to define pixel regions; A gate insulating film 11 formed on the gate wiring 12 and the first substrate 10; A passivation layer 14 formed on the data line 13 and the gate insulating layer 11 and having an inclined surface at an edge of the pixel region; A pixel electrode 15 formed on the passivation layer 14 in the pixel region; A thin film transistor (not shown) formed at an intersection point of the gate line 12 and the data line 13; A light blocking layer 21 formed in a predetermined region on the second substrate 20 to prevent light leakage generated in the region in which the gate wiring 12, the data wiring 13, and the thin film transistor are formed; A color filter layer 22 formed on the light blocking layer 21; A common electrode 23 formed on an entire surface of the color filter layer 22; And a liquid crystal layer (not shown) formed between the first substrate 10 and the second substrate 20.

Here, the passivation layer 14 is formed to be thicker on the data line 13 and the gate line 12 than the thickness in the pixel area, and the data line 13 and the gate line 12 in the pixel area. It is formed to become thicker toward the side to have an inclined surface.

In order to form the protective film 14 having the inclined surface, a photo-acryl, which is a positive type photo-resist, is used as a material, and a half-tone exposure method is used for patterning. Use

That is, after the photo-acryl is deposited on the gate insulating layer 11 on which the data line 13 is formed, the photo-acryl is patterned using a mask to form a protective film 14 having an inclined surface and a step.

Here, the passivation film 14 in the pixel region is formed thin so that the passivation film 14 on the data wiring 13 and the gate wiring 12 and the passivation film 14 in the pixel region have a large step. In addition, the mask prevents light from being applied to the data line 13 and the gate line 12, and receives a lot of light from the pixel area, and gradually increases the light from the data line 13 and the gate line 12 toward the pixel area. Use what is designed to receive a lot.

On the other hand, when a negative type photo-resist is used as the material of the protective film 14, the mask receives a lot of light on the data line 13 and the gate line 12, and light is applied to the pixel region. It is designed to receive less light from the data line 13 and the gate line 12 toward the pixel area.

The pixel electrode 15 is preferably made of indium tin oxide (ITO) or indium zinc oxide (IZO), and the edge of the pixel electrode 15 is inclined by the inclined surface of the passivation layer 14.

The liquid crystal layer (not shown) is a liquid crystal having a negative dielectric anisotropy, and the chiral dopant is preferably included in the VA (Vertical Alignment) liquid crystal so that the molecular arrangement and optical axis of the liquid crystal are continuously formed by applying an electric field.

The gate insulating layer 11 is preferably formed of SiNx or SiOx, and the common electrode 23 is preferably formed of ITO.                     

In addition, the gate wiring 12, the data wiring 13, the color filter layer 22, etc. may be formed by changing the range within a range that can be easily implemented by those skilled in the art having ordinary skill in the art. have.

Although not shown in the drawing, the gate line 12, the data line 13, and the pixel electrode 15 further include a thin film transistor including a gate electrode, a source electrode, and a drain electrode, respectively, An alignment layer may be formed on an entire surface of at least one of the first substrate 10 and the second substrate 20.

In addition, the first substrate 10 and the second substrate (in order to compensate for the viewing angle in a direction perpendicular to the substrate and a direction depending on the viewing angle change to widen an area without gray inversion, and to increase the contrast ratio in the inclined direction. Retardation film may be formed on the outer surface of at least one of the substrate 20).

In the liquid crystal display according to the first exemplary embodiment of the present invention configured as described above, the protective film 14 is formed to have an inclined surface at the edge of the pixel region, and the edge of the pixel electrode 15 is formed by the inclined surface of the protective film 14. It is characterized by being inclined.

Thus, the liquid crystals positioned at the edges of the pixel electrode 15 are oriented obliquely toward the center of the pixel area, and when a voltage is applied, the liquid crystals lie in the same direction as the liquid crystals are oriented by the electric field of the edge of the pixel electrode 15. The liquid crystals lie toward the center of the pixel region.

Therefore, the liquid crystal display device of the present invention can implement a multi-domain even without a dielectric structure or an electric field induction window.                     

Second embodiment

4 is a plan view of a unit pixel of a multi-domain liquid crystal display according to a second exemplary embodiment of the present invention, FIG. 5A is a cross-sectional view taken along line AA ′ of FIG. 4, and FIG. 5B is a line BB ′ of FIG. 4. It is a cross section of.

A second embodiment of the present invention includes a first substrate 10 and a second substrate 20; A plurality of gate lines 12 and data lines 13 formed on the first substrate 10 in a length and width direction to define pixel regions; A gate insulating film 11 formed on the gate wiring 12 and the first substrate 10; A passivation layer 14 formed on the data line 13 and the gate insulating layer 11 and having an inclined surface at an edge of the pixel region; A pixel electrode 15 formed on the passivation layer 14 in the pixel region; A thin film transistor (not shown) formed at an intersection point of the gate line 12 and the data line 13; A light blocking layer 21 formed in a predetermined region on the second substrate 20 to prevent light leakage generated in the region in which the gate wiring 12, the data wiring 13, and the thin film transistor are formed; A color filter layer 22 formed on the light blocking layer 21; A common electrode 23 formed on an entire surface of the color filter layer 22; A dielectric structure 24 formed on the common electrode 23; And a liquid crystal layer (not shown) formed between the first substrate 10 and the second substrate 20.

That is, in the liquid crystal display according to the second exemplary embodiment of the present invention, the passivation layer 14 and the pixel electrode 15 are formed to have an inclined surface at the edge of the pixel region as in the first exemplary embodiment, and the pixel region for stable texture is realized. It is characterized in that the dielectric structure 24 is further formed at the center thereof.
Here, the protective film 14 is formed of a photo-acryl material, and uses a half-tone exposure method for patterning to have an inclined surface.

The dielectric structure 24 is formed by depositing an acrylic resin (B- Photoacrylate) or BCB (BenzoCycloButene) material on the common electrode on the second substrate and patterning the photolithography process and etching process using a mask.

Third embodiment

FIG. 6 is a plan view illustrating various types of unit pixels of a multi-domain liquid crystal display device according to a third exemplary embodiment of the present invention, FIG. 7A is a cross-sectional view taken along a line A-A 'of FIG. 6, and FIG. 7B is a B- line of FIG. 6. Sectional view of line B '.

A third embodiment of the present invention includes a first substrate 10 and a second substrate 20; A plurality of gate lines 12 and data lines 13 formed on the first substrate 10 in a length and width direction to define pixel regions; A gate insulating film 11 formed on the gate wiring 12 and the first substrate 10; A passivation layer 14 formed on the data line 13 and the gate insulating layer 11 and having an inclined surface at edges and centers of the pixel region; A pixel electrode 15 formed on the passivation layer 14 in the pixel region; A thin film transistor (not shown) formed at an intersection point of the gate line 12 and the data line 13; A light blocking layer 21 formed in a predetermined region on the second substrate 20 to prevent light leakage generated in the region in which the gate wiring 12, the data wiring 13, and the thin film transistor are formed; A color filter layer 22 formed on the light blocking layer 21; A common electrode 23 formed on an entire surface of the color filter layer 22; And a liquid crystal layer (not shown) formed between the first substrate 10 and the second substrate 20.

That is, the liquid crystal display device according to the third embodiment of the present invention is formed to have an inclined surface not only at the edge of the pixel region but also at the center of the pixel region as in the first embodiment. Here, the inclined surface in the center of the pixel region may be implemented by the protective film projection.

As described above, the pixel electrode 15 has an inclined surface at its edge and the center by the passivation film 14 having the inclined surface, and thus the electric field directions at the edge and the center of the pixel electrode 15 are formed the same.
Here, the protective film 14 having the protective film projections is formed of photo-acryl material, and a half-tone exposure method is used for patterning to have an inclined surface.

Meanwhile, since the initial alignment direction and the electric field direction are different from each other at the center of the pixel electrode 15, a light shielding layer may be further formed on the second substrate 20 corresponding to the passivation layer protrusion to prevent light leakage.

The present invention is not limited to the above embodiments, but is within the range that can be modified by those skilled in the art within the scope of the technical idea of the present invention.

The multi-domain liquid crystal display device and the method of manufacturing the same according to the present invention having the above-described configuration form an inclined surface at the edge of the pixel electrode by using a protective film having an inclined surface, thereby forming a pixel without forming a dielectric structure or an electric field induction window on the lower substrate. Regions can be divided into multiple domains. Therefore, the manufacturing process can be simplified.

In addition, since the thickness of the passivation layer in the pixel region can be reduced, light transmittance can be improved, and since the passivation layer on the data line and the gate line is formed thick, parasitic current generated between the line and the pixel electrode can be prevented.

Claims (13)

A first substrate and a second substrate; A plurality of gate lines and data lines formed vertically and horizontally on the first substrate to define pixel regions; A passivation layer formed on an entire surface of the first substrate including the data line and the gate line and formed to have an inclined surface at an edge of the pixel area; A pixel electrode formed in the pixel region on the passivation layer; A color filter layer formed on the second substrate; A common electrode formed on the color filter layer; And A liquid crystal layer formed between the first substrate and the second substrate, And the passivation layer includes a passivation layer projection having an inclined surface at the center of the pixel area. The method of claim 1, And wherein the passivation layer is formed to be thicker on the data line and the gate line than on the pixel area. The method of claim 1, The protective film is a multi-domain liquid crystal display device, characterized in that formed by photo-acrylic. The method of claim 1, And a dielectric structure formed over the common electrode. The method of claim 4, wherein The dielectric structure is a multi-domain liquid crystal display device, characterized in that made of acrylic resin (photoacrylate) or BCB (BenzoCycloButene). delete The method of claim 1, The liquid crystal layer is a multi-domain liquid crystal display device, characterized in that made of VA liquid crystal. Providing a first substrate and a second substrate; Forming a plurality of gate lines and data lines formed on the first substrate in a length and width direction to define pixel regions; Forming a protective film formed on an entire surface of the first substrate including the data wires and the gate wires, using a half-tone exposure method, and forming a protective film protrusion at a center of the pixel area and having an inclined surface at an edge thereof; Forming a pixel electrode in the pixel area on the passivation layer; Forming a color filter layer on the second substrate; Forming a common electrode on the color filter layer; And Forming a liquid crystal layer between the first substrate and the second substrate. The method of claim 8, And wherein the passivation layer is formed to be thicker on the data line and the gate line than the thickness in the pixel area. The method of claim 8, The protective film is a method of manufacturing a multi-domain liquid crystal display device, characterized in that formed by photo-acrylic. The method of claim 8, A method of manufacturing a multi-domain liquid crystal display device, the method comprising: forming a dielectric structure formed on the common electrode. The method of claim 11, The dielectric structure is a method of manufacturing a multi-domain liquid crystal display device, characterized in that made of acrylic resin (photoacrylate) or BCB (BenzoCycloButene). delete

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