KR20080100027A - Liquid crystal display - Google Patents

Abstract

A liquid crystal display device is provided to improve the response speed by installing a tilt driving electrode or shortening the length of a microelectrode. A liquid crystal display comprises a first insulating substrate, a pixel electrode(82), a second insulating substrate, a common electrode and a liquid crystal layer. The pixel electrode is formed on the first insulating substrate. The pixel electrode comprises the domain group consisting of a plurality of domains with a plurality of, and each domain made of a plurality of microelectrodes materially side by side arranged to the fixed direction. The second insulating substrate is place facing the first insulating substrate. The common electrode formed on the second insulating substrate and is not patterned. The liquid crystal layer is interposed between the first and the second insulating substrate.

Description

Liquid crystal display

1 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a first exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line AA ′ of the thin film transistor array panel of FIG. 1.

3 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line BB ′ of the thin film transistor array panel of FIG. 1.

4 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a modification of the first exemplary embodiment of the present invention.

FIG. 5 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line CC ′ of the thin film transistor array panel of FIG. 4.

6 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a second exemplary embodiment of the present invention.

FIG. 7 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line D-D ′ of the thin film transistor array panel of FIG. 6.

FIG. 8 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line E-E ′ of the thin film transistor array panel of FIG. 6.

9 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a modification of the second exemplary embodiment of the present invention.

FIG. 10 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line F-F ′ of the thin film transistor array panel of FIG. 9.

11 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a third exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: first insulating substrate 22: gate line

26: gate electrode 28: storage wiring

30: gate insulating film 40: semiconductor layer

55, 56: ohmic contact layer 62: data line

65 source electrode 66 drain electrode

70, 70 ': Shield 76, 77, 78: Contact hole

82, 84, 86: pixel electrode

82_1, 84_1, 86_1: first fine electrode

82_2, 84_2, 86_2: second fine electrode 82_3, 84_3, 86_3: third fine electrode

82_4, 84_4, 86_4: fourth fine electrode

83_1, 85_1, 87_1: first fine slit

83_2, 85_2, 87_2: second fine slit 83_3, 85_3, 87_3: third fine slit

83_4, 85_4, 87_4: Fourth fine slit 92, 152: Vertical alignment film

95_1, 97_1: first connection pattern 95_2, 97_2: second connection pattern

96, 96 ': connection pattern 97_3: third connection pattern

97_4: fourth connection pattern

100, 100 ', 101, 101': thin film transistor array panel

110: second insulating substrate 120, 121, 121 ': black matrix

130: color filter 135: overcoat layer

140: common electrode

162, 183, 184, 184'_1, 184'_2: Tilt driving force applying electrode

182: additional tilt driving force electrode

200: common electrode display panel 300: liquid crystal layer

310: liquid crystal

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having improved response speed of liquid crystals.

The liquid crystal display is one of the most widely used flat panel display devices. The liquid crystal display includes two substrates on which a field generating electrode such as a pixel electrode and a common electrode are formed, and a liquid crystal layer interposed therebetween. Is applied to generate an electric field in the liquid crystal layer, thereby determining the orientation of the liquid crystal in the liquid crystal layer and controlling the polarization of incident light to display an image.

Among them, the vertical alignment mode liquid crystal display in which the long axis of the liquid crystal is arranged vertically with respect to the upper and lower substrates without an electric field applied, has gained much attention due to its large contrast ratio and easy implementation of a wide reference viewing angle. Vertical alignment mode As a means for implementing a wide viewing angle in a liquid crystal display, there are a method of forming a gap in the field generating electrode and a method of forming a protrusion on the field generating electrode.

The liquid crystal display device having a gap includes a patterned vertical alignment (PVA) mode liquid crystal display device having a gap on both upper and lower substrates, and a patternless VA (patternless) in which a fine pattern is formed only on the lower substrate and no pattern is formed on the upper substrate. VA mode liquid crystal display devices, and the like, and there is an increasing demand for a patternless VA mode liquid crystal display device which is advantageous in preventing static electricity and does not cause an alignment miss.

However, the patternless VA mode liquid crystal display has a problem in that random motion occurs in a liquid crystal or a reverse domain is induced, resulting in a slow response speed, a decrease in luminance, or an instant afterimage.

Accordingly, there is a need for a liquid crystal display device in which the reverse domain is reduced and the response speed is improved.

An object of the present invention is to provide a liquid crystal display device having improved response speed.

Technical problems of the present invention are not limited to the above-mentioned technical problems, other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

A liquid crystal display according to an exemplary embodiment of the present invention for achieving the above technical problem is a pixel electrode including a plurality of domain groups formed on a first insulating substrate and the first insulating substrate and composed of a plurality of domains. Each of the domains may include a pixel electrode including a plurality of fine electrodes arranged substantially parallel to each other in a predetermined direction, a second insulating substrate facing the first insulating substrate, and a common pattern formed on the second insulating substrate and not patterned. And a liquid crystal layer interposed between an electrode and the first and second insulating substrates, wherein the maximum length of the fine electrode does not exceed (0.5) ^3/2 times the horizontal length of the pixel electrode.

According to another aspect of the present invention, a liquid crystal display device includes a data line formed in a vertical direction on a first insulating substrate and a pair of tilt driving force formed in parallel with the data line and overlapping the data line. A pixel electrode disposed between an imparting electrode and the pair of tilt driving force imparting electrodes, wherein each of the domains comprises a plurality of fine electrodes arranged substantially side by side in a predetermined direction; A second insulating substrate facing the first insulating substrate, a common electrode formed on the second insulating substrate and not patterned, and a liquid crystal layer interposed between the first and second insulating substrates; The layer includes a liquid crystal that receives a tilt driving force from the tilt driving force applying electrode when a driving voltage is applied.

According to another aspect of the present invention, there is provided a liquid crystal display device including first and second connection patterns arranged substantially in parallel with each other in a first direction, and arranged in a second direction. A pixel electrode consisting of a plurality of first and second fine electrodes respectively connected to a second connection pattern, wherein the plurality of first and second fine electrodes respectively face pixel electrodes arranged substantially side by side and opposite the first insulating substrate. A second insulating substrate, a common electrode formed on the second insulating substrate and not patterned, and a liquid crystal layer interposed between the first and second insulating substrates, the maximum of the first and second fine electrodes The length does not exceed (0.5) ^3/2 times the horizontal length of the pixel electrode.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments and modifications described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments and modifications disclosed below, but may be embodied in various forms, and only the present embodiments are provided so that this disclosure will be thorough and complete in the art to which the present invention pertains. It is provided to fully inform the person skilled in the art the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

When elements or layers are referred to as "on" or "on" of another element or layer, intervening other elements or layers as well as intervening another layer or element in between It includes everything. On the other hand, when a device is referred to as "directly on" or "directly on" indicates that no device or layer is intervened in the middle.

The spatially relative terms " below ", " beneath ", " lower ", " above ", " upper " It may be used to easily describe the correlation of a device or components with other devices or components. Spatially relative terms are to be understood as including terms in different directions of the device in use or operation in addition to the directions shown in the figures.

Hereinafter, a liquid crystal display according to a first exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a first exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line AA ′ of the thin film transistor array panel of FIG. 1. 3 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line BB ′ of the thin film transistor array panel of FIG. 1.

1 to 3, the liquid crystal display of the present exemplary embodiment includes a thin film transistor array panel 100 and a common electrode panel 200 disposed to face each other, and a liquid crystal interposed between the two display panels 100 and 200. Layer 300.

Both the color filter 130 and the pixel electrode 82 may be formed in the thin film transistor array panel 100 included in the liquid crystal display of the present exemplary embodiment. In addition, the liquid crystal display of the present exemplary embodiment may have an array on color filter (AOC) structure in which a thin film transistor array such as a gate wiring is formed on the color filter 130.

In the thin film transistor array panel 100 of the AOC structure liquid crystal display, a black matrix 120 defining a pixel region is formed directly on the first insulating substrate 10. The black matrix 120 of the present embodiment may be formed of, for example, a metal (metal oxide) such as chromium (Cr) or chromium oxide, or an organic black resist, and serves to improve light quality by preventing light leakage. The black matrix 120 may be formed to overlap the gate and / or data line to maximize the aperture ratio.

Red, green, and blue color filters 130 are sequentially arranged in the pixel area defined by the black matrix 120. These color filters 130 serve to pass only light of a specific wavelength band.

The color filter 130 may be formed of a photosensitive organic material, for example, a photoresist. These color filters 130 may be formed to have the same thickness or may have a predetermined step.

An overcoat layer 135 may be formed on the color filter 130 to planarize these steps.

The gate line 22 is formed in the horizontal direction, for example on the overcoat layer 135, and the gate electrode 26 formed in the form of a processus | protrusion is formed in the gate line 22. As shown in FIG. The gate line 22 and the gate electrode 26 are called gate wirings.

In addition, the storage wiring 28 is formed on the first insulating substrate 10 and extends in the horizontal direction substantially in parallel with the gate line 22. The storage wiring 28 is formed to overlap a part of the pixel electrode 82 to be described later in the pixel. In the present embodiment illustrated in FIG. 1, the storage wiring 28 is disposed at the center of the pixel. However, the present invention is not limited thereto, and the storage wiring 28 overlaps the pixel electrode 82 so that a constant storage capacitance is obtained. The shape and arrangement of the storage wiring 28 may be modified in various forms within a range that satisfies the conditions for forming the).

The gate wirings 22 and 26 and the storage wiring 28 include aluminum-based metals such as aluminum (Al) and aluminum alloys, silver-based metals such as silver (Ag) and silver alloys, and copper-based metals such as copper (Cu) and copper alloys. Metal, molybdenum (Mo) and molybdenum alloys such as molybdenum-based metal, it may be made of chromium (Cr), titanium (Ti), tantalum (Ta). In addition, the gate lines 22 and 26 and the storage line 28 may have a multilayer structure including two conductive layers (not shown) having different physical properties. One of the conductive films has a low resistivity metal such as aluminum-based metal, silver-based metal, or copper-based metal so as to reduce signal delay or voltage drop in the gate wirings 22 and 26 and storage wiring 28. And so on. In contrast, the other conductive layer is made of a material having excellent contact properties with other materials, particularly indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metals, chromium, titanium, tantalum and the like. A good example of such a combination is a chromium bottom film and an aluminum top film and an aluminum bottom film and a molybdenum top film. However, the present invention is not limited thereto, and the gate wirings 22 and 26 and the storage wiring 28 may be made of various metals and conductors.

A gate insulating film 30 made of silicon nitride (SiNx), silicon oxide, or the like is formed on the gate wirings 22 and 26 and the storage wiring 28.

On the gate insulating film 30, a semiconductor layer 40 made of hydrogenated amorphous silicon, polycrystalline silicon, or the like is formed. The semiconductor layer 40 may have various shapes such as an island shape and a linear shape. For example, the semiconductor layer 40 may be formed in an island shape on the gate electrode 26 as shown in FIG. 1. In addition, in another embodiment of the present invention, when the semiconductor layer is linearly formed, the semiconductor layer may be positioned below the data line 62 and extend to the upper portion of the gate electrode 26.

On the semiconductor layer 40, ohmic contact layers 55 and 56 made of a material such as n + hydrogenated amorphous silicon doped with a high concentration of silicide or n-type impurities are formed. The ohmic contact layers 55 and 56 may have various shapes such as an island shape and a linear shape. For example, when the ohmic contact layers 55 and 56 have island shapes, the ohmic contact layers 55 and 56 may be island shapes. 56 may be located under the source electrode 65 and the drain electrode 66. In addition, in another embodiment of the present invention, when the ohmic contact layer is linear, the ohmic contact layer may be formed to extend below the data line 62.

The data line 62 and the drain electrode 66 are formed on the ohmic contact layers 55 and 56 and the gate insulating layer 30. For example, the data line 62 extends in the vertical direction and crosses the gate line 22 to define a pixel. The data line 62 is formed in a lower layer than the pixel electrode 82 which will be described later. The source electrode 65 extends from the data line 62 to the upper portion of the semiconductor layer 40 in the form of a branch. The drain electrode 66 is separated from the source electrode 65 and positioned above the semiconductor layer 40 so as to face the source electrode 65 with respect to the gate electrode 26. The drain electrode 66 includes a rod-shaped pattern disposed on the semiconductor layer 40 and an extension pattern extending from the rod-shaped pattern and having a large area and in which the contact hole 76 is located.

The data line 62, the source electrode 65, and the drain electrode 66 are referred to as data lines 62, 65, and 66.

The data lines 62, 65, and 66 are preferably made of refractory metals such as chromium, molybdenum-based metals, tantalum, and titanium, and include a lower layer (not shown) such as a refractory metal and an upper layer of low resistance material (not shown). It may have a multilayer film structure consisting of a). Examples of the multilayer film structure include a triple film of molybdenum film, aluminum film, and molybdenum film in addition to the above-described double film of chromium lower film and aluminum upper film or aluminum lower film and molybdenum upper film.

The source electrode 65 overlaps at least a portion of the semiconductor layer 40, and the drain electrode 66 faces the source electrode 65 around the gate electrode 26 and at least partially overlaps the semiconductor layer 40. do. Here, the ohmic contact layers 55 and 56 are interposed between the semiconductor layer 40, the source electrode 65, and the semiconductor layer 40 and the drain electrode 66 to lower contact resistance therebetween.

A passivation layer 70 made of an insulating layer is formed on the data line 62, the drain electrode 66, and the exposed semiconductor layer 40. The protective film 70 of the present embodiment may be made of, for example, an inorganic material made of silicon nitride or silicon oxide. Since the inorganic material is generally higher in dielectric constant than the organic material, the protective film 70 made of the inorganic material transmits electrical energy better than that of the organic material. Accordingly, a horizontal field may be formed between the data line 62 disposed below the passivation layer 70 made of an inorganic material and the first microelectrode 82_1 disposed above the passivation layer 70. 70, a horizontal electric field may be formed between the tilt driving force applying electrode 162 disposed below the second fine electrode 82_2 disposed on the passivation layer 70. This horizontal electric field will be described in detail later.

In the passivation layer 70, a contact hole 76 exposing the drain electrode 66 is formed. The contact hole 76 may be formed to be adjacent to the first connection pattern 95_1 connecting the third and fourth fine electrodes 82_3 and 82_4.

The pixel electrode 82 electrically connected to the drain electrode 66 is formed on the passivation layer 70 through the contact hole 76 for each pixel. That is, the pixel electrode 82 is physically and electrically connected to the drain electrode 66 through the contact hole 76 to receive a data voltage from the drain electrode 66. The pixel electrode 82 is made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO).

Hereinafter, the characteristic of the pixel electrode of this embodiment is demonstrated in detail.

Referring to FIG. 1, the pixel electrode 82 of the present exemplary embodiment may be formed of a plurality of domain groups. One domain group may be formed, for example, on each quadrant that divides the pixel electrode 82 into quarters. In addition, each domain group may be composed of a plurality of domains, for example, one may be formed on each quadrant that divides each domain group into quarters. That is, each pixel electrode 82 may be divided into, for example, 16 domains. Each domain is composed of a plurality of fine electrodes 82_1, 82_2, 82_3, 82_4 arranged substantially side by side in a constant direction, and between the plurality of fine electrodes 82_1, 82_2, 82_3, 82_4, fine slits 83_1, 83_2. , 83_3, 83_4) are disposed. Domains adjacent to each other are connected by the first connection pattern 95_1 to form one domain group. Each domain group is disposed on each quadrant that divides the pixel electrode 82 into quadrants and is connected to the adjacent domain group by the second connection pattern 95_2.

The fine electrodes 82_1, 82_2, 82_3, and 82_4 may have a bar shape that is elongated in a predetermined direction in each domain. The fine electrodes 82_1, 82_2, 82_3 and 82_4 and the fine slits 83_1, 83_2, 83_3 and 83_4 are arranged side by side in one direction in one domain, and the fine electrodes 82_1, 82_2, 82_3 and 82_4 are formed in different domains. ) Are arranged in different directions.

For example, among the quadrants that divide each domain group into four quadrants, the first domain located in the quadrant of the upper direction includes a plurality of first fine electrodes 82_1 arranged side by side in the first direction. The first direction may be substantially 45 ° with respect to the polarization axis of the polarizer (not shown) formed on the first insulating substrate 10. The first fine slits 83_1 are disposed between the plurality of first fine electrodes 82_1 formed in the first direction. In addition, among the quadrants that divide each domain group into quadrants, the second domains positioned in the quadrants of the left and upper directions include a plurality of second fine electrodes 82_2 arranged side by side in the second direction. The second direction may be substantially perpendicular to the first direction, and may be substantially 135 ° with respect to the polarization axis of the polarizer (not shown) formed on the first insulating substrate 10. The second fine slits 83_2 are disposed between the plurality of second fine electrodes 82_2. The third domain may be located in, for example, quadrants in the left and bottom directions among quadrants that divide each domain group into quadrants. The third domain includes a plurality of third fine electrodes 82_3 arranged side by side in the third direction. The third direction may be substantially perpendicular to the second direction, and may be substantially 225 ° with respect to the polarization axis of the polarizer (not shown) formed on the first insulating substrate 10. The third fine slits 83_3 are disposed between the adjacent third fine electrodes 82_3. For example, the fourth domain may be located in a quadrant of the lower right and quadrants of the quadrant that divides each domain group. The fourth domain includes a plurality of fourth fine electrodes 82_4 arranged side by side in the fourth direction. The fourth direction may be substantially perpendicular to the third direction and the first direction, and may be substantially 315 ° with respect to the polarization axis of the polarizer (not shown) formed on the first insulating substrate 10. The fourth fine slits 83_4 are disposed between the plurality of fourth fine electrodes 82_4 formed in the fourth direction.

Each of the fine electrodes 82_1, 82_2, 82_3, and 82_4 is disposed in each domain that divides the pixel electrode 82 into, for example, sixteen, and is formed in a constant direction as described above, so that the fine electrodes 82_1, 82_2, The maximum lengths of 82_3 and 82_4 do not exceed (0.5) ^3/2 times the horizontal length of the pixel electrode 82. As described above, the liquid crystal 310 disposed on the pixel electrode 82 having a short length may quickly be tilted toward the first connection pattern 95_1 when the driving voltage is applied, thereby forming a reverse domain in the liquid crystal display. Can not be prevented.

The widths of the fine electrodes 82_1, 82_2, 82_3 and 82_4 and the fine slits 83_1, 83_2, 83_3 and 83_4 may be the same. In this case, the widths of the fine electrodes 82_1, 82_2, 82_3 and 82_4 may be constant regardless of the distance from the first connection pattern 95_1. The high light transmittance and the fine electrodes 82_1, 82_2, 82_3 and 82_4 may be reduced. In consideration of the exposure sensitivity of the exposure machine to be formed may be 1 ~ 5㎛. The widths of the fine electrodes 82_1, 82_2, 82_3, and 82_4 of the present exemplary embodiment may become narrower as they move away from the first connection pattern 95_1. When the fine electrodes 82_1, 82_2, 82_3, and 82_4 have such widths, the liquid crystal 310, which will be described later, may be easily tilted toward the first connection pattern 95_1.

The first connection pattern 95_1 connecting each domain may have a cross shape, for example, to divide each domain group into a plurality of domains in a horizontal direction and a vertical direction. The first connection pattern 95_1 of the present exemplary embodiment is not limited to such a shape, and may have a zigzag shape in which extension portions of each of the fine electrodes 82_1, 82_2, 82_3, and 82_4 are alternately arranged, and various modifications are possible. Do.

Hereinafter, referring to FIGS. 1 and 2, the behavior of the tilt driving force applying electrode 162 and the liquid crystal 310 thereby will be described.

The tilt driving force applying electrode 162 and the data line 62 are disposed to be spaced apart from the fine electrodes 82_1, 82_2, 82_3 and 82_4 by a predetermined interval to form a horizontal electric field with the fine electrodes 82_1, 82_2, 82_3 and 82_4 to form a liquid crystal. The tilt driving force is imparted to 310. The tilt driving force imparting electrode 162 is formed in parallel with the data line 62 so that the pixel electrode 82 is divided into two equally in the longitudinal direction. The domain group may be disposed at both sides of the tilt driving force imparting electrode 162. As a result, a domain group is disposed between the tilt driving force applying electrode 162 and the data line 62 spaced apart from the edge of the pixel electrode 82 by a predetermined interval. The tilt driving force applying electrode 162 of the present embodiment may be formed on the same layer as the data line 62. A protective film 70 is formed in the layer between the data line 62 or the tilt driving force imparting electrode 162 and the fine electrodes 82_1, 82_2, 82_3 and 82_4 of the present embodiment. 62) or the horizontal electric field is not blocked between the tilt driving force applying electrode 162 and the fine electrodes 82_1, 82_2, 82_3 and 82_4 disposed to be spaced apart from the predetermined electrodes. Accordingly, a horizontal electric field is formed by the data line 62 and the fine electrodes 82_1, 82_2, 82_3 and 82_4, and the tilt driving force applying electrode 162 and the fine electrodes 82_1, 82_2, 82_3 and 82_4 when the driving voltage is applied. do. The horizontal electric field formed as described above tilts the liquid crystal 310 disposed above the domain group disposed between the data line 62 and the tilt driving force applying electrode 162 toward the first connection pattern 95_1. That is, the liquid crystal 310 is tilted toward the first connection pattern 95_1 at a high speed without displaying random motion or forming a reverse domain when the driving voltage is applied, thereby improving the response speed of the liquid crystal display.

A first vertical alignment layer 92 may be formed on the pixel electrode 82 and the passivation layer 70 of the present exemplary embodiment to align the liquid crystals. The first vertical alignment layer 92 orients the liquid crystals 310 vertically together with the second vertical alignment layer 152. Accordingly, when the driving voltage is not applied to the liquid crystal display, a clear black color is implemented in the liquid crystal display. The first vertical alignment layer 92 may be formed of a material including, for example, polyimide as a main chain and a side chain.

A polarizing plate (not shown) may be formed on the first insulating substrate 10. In more detail, the polarizer may be formed on the first insulating substrate 10 opposite to the pixel electrode 82. The polarization axes of the polarizing plates formed on the first insulating substrate 10 are perpendicular to the polarization axes of the polarizing plates formed on the second insulating substrate 110.

The common electrode display panel 200 includes a common electrode 140 formed on the second insulating substrate 110 and not patterned, and is disposed to face the thin film transistor array panel 100. The common electrode 140 of this embodiment is not patterned. Since the process for patterning the common electrode 140 is not required for the common electrode display panel 200 according to the present exemplary embodiment, misalignment may be prevented from occurring when the thin film transistor array panel 100 and the common electrode display panel 200 are assembled. It does not need to be anti-static treatment, the transmittance is high and the manufacturing cost can be reduced.

A second vertical alignment layer 152 that vertically aligns the liquid crystals 310 is formed on the common electrode 140. A spacer may be interposed between the thin film transistor array panel 100 and the common electrode panel 200 to maintain a cell gap, which is a gap between the two display panels.

On the second insulation substrate 110, a polarizer may be disposed on an opposite surface on which the common electrode 140 is formed, which is perpendicular to the polarization axis of the polarizer formed on the first insulating substrate 10.

The liquid crystal layer 300 formed from the liquid crystal 310, the UV curable monomer, and the UV curing initiator is interposed between the thin film transistor array panel 100 and the common electrode display panel 200 facing each other.

The liquid crystal 310 included in the liquid crystal layer 300 may have negative dielectric anisotropy, and may be, for example, the nematic liquid crystal 310. The UV curable monomer may be, for example, an acrylate-based monomer, the initiator for UV curing may be made of a material that can be absorbed in the UV region.

A backlight assembly including a lamp is disposed under the thin film transistor array panel 100, the common electrode display panel 200, and the liquid crystal layer 300 interposed therebetween.

Hereinafter, a liquid crystal display according to a modification of the first embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5. 4 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a modification of the first exemplary embodiment of the present invention. FIG. 5 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line CC ′ of the thin film transistor array panel of FIG. 4. In the following embodiments and modifications, the same reference numerals are used for the same elements as those of the first embodiment of the present invention for convenience of description, and the description thereof is omitted or simplified.

4 and 5, the liquid crystal display of the present modification includes a thin film transistor array panel 100 ′ having a protective film 70 ′ made of an organic material.

The passivation layer 70 ′ is disposed in the layer between the fine electrodes 82_1, 82_2, 82_3 and 82_4 and the data line 62 as in the first embodiment of the present invention. The passivation layer 70 ′ is made of an organic material, and thus has low dielectric constant as compared with the case of an inorganic material, and thus, electrical energy may not be transferred well. As a result, a horizontal electric field is not formed between the data line 62 and the first microelectrode 82_1 or mostly blocked to form a weak horizontal electric field. That is, the data line 62 of the present modification does not give the tilt driving force to the liquid crystal 310.

In this modification, the tilt driving force imparting electrode 183 is formed on the upper layer than the protective film 70 'made of an organic material. The tilt driving force applying electrode 183 is formed on the same layer as the fine electrodes 82_1, 82_2, 82_3 and 82_4, for example, to form a horizontal electric field with the fine electrodes 82_1, 82_2, 82_3 and 82_4, and to the liquid crystal 310. Give tilt driving force. The tilt driving force applying electrode 183 is formed in the vertical direction to divide the pixel electrode 82 into two. Domain groups including the fine electrodes 82_1, 82_2, 82_3, and 82_4 may be disposed at both sides of the tilt driving force applying electrode 183. That is, the tilt driving force applying electrode 183 imparts a tilt driving force to the liquid crystal 310 at one side of the fine electrodes 82_1, 82_2, 82_3, and 82_4. Meanwhile, the additional tilt driving force applying electrode 182 is disposed at the edge of the pixel electrode 82 so as to overlap the other side of the fine electrodes 82_1, 82_2, 82_3, and 82_4 in parallel with the data line 62. ) To give tilt driving force. The additional tilt driving force applying electrode 182 may be formed on the same layer as the fine electrodes 82_1, 82_2, 82_3 and 82_4. As a result, each domain group is disposed between the tilt driving force imparting electrode 183 and the additional tilt driving force imparting electrode 182 to impart the tilt driving force to the liquid crystal 310 when the driving voltage is applied. 310 is tilted toward the first connection pattern 95_1.

Hereinafter, the liquid crystal display according to the second exemplary embodiment of the present invention will be described in detail with reference to FIGS. 6 to 8. 6 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a second exemplary embodiment of the present invention. FIG. 7 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line D-D ′ of the thin film transistor array panel of FIG. 6. FIG. 8 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line E-E ′ of the thin film transistor array panel of FIG. 6.

6 to 8, both the color filter 131, the pixel electrode 84, and the like may be formed in the thin film transistor array panel 101 included in the liquid crystal display of the present exemplary embodiment. In addition, the liquid crystal display of the present exemplary embodiment may have a color filter on array (COA) structure in which a black matrix 121 and a color filter 131 are formed on a thin film transistor array such as a gate wiring.

In the thin film transistor array panel 101 according to the present embodiment, a gate wiring, a gate insulating film 30, a semiconductor layer 40, ohmic contact layers 55 and 56, and a data wiring are sequentially formed on the first insulating substrate 10. It is. Here, the data lines 62 may be formed in the vertical direction along both sides of the pixel electrode 82, and may be disposed in pairs per pixel electrode 82. The same signal is applied to the pair of data lines 62 arranged on one pixel electrode 82. The passivation layer 71 may be formed to cover the upper portion of the data line, and may be formed of, for example, an inorganic material made of silicon nitride or silicon oxide.

The black matrix 121 defining the pixel region is formed on the gate line 22 and the data line 62. The black matrix 121 of the present embodiment may be formed to overlap the data lines 62. The black matrix 121 may be formed of, for example, an organic black resist, and serves to improve light quality by preventing light leakage.

In the pixel area defined by the black matrix 121, red, green, and blue color filters 131 are sequentially arranged. These color filters 131 only serve to pass light of a specific wavelength band. The color filter 131 may be formed of a photosensitive organic material, for example, a photoresist. These color filters 131 may be formed to have the same thickness or may have a predetermined step. An overcoat layer (not shown) may be formed or omitted on the color filter 131.

The pixel electrode 84 of the present exemplary embodiment is disposed above the color filter 131 and electrically connected to the drain electrode 66 by a contact hole 77 formed to penetrate the color filter 131 and the passivation layer 71. . The pixel electrode 84 may be formed of first to fourth domains divided into four parts. Each of the first to fourth domains may be arranged to be substantially parallel to each other at an angle of 45 °, 135 °, 225 °, and 315 ° with respect to a polarization axis of a polarizing plate (not shown) formed on a first insulating substrate (not shown). To fourth fourth electrodes 84_1, 84_2, 84_3, and 84_4. The first to fourth fine electrodes 84_1, 84_2, 84_3 and 84_4 are alternately arranged with the first to fourth fine slits 85_1, 85_2, 85_3 and 85_4, respectively. Each of these fine electrodes 84_1, 84_2, 84_3, 84_4 is connected by a connection pattern 96. The shape of the connection pattern 96 may be a cross shape or a zigzag shape like the first connection pattern (see 95_1 of FIG. 1) of the first embodiment of the present invention.

The tilt driving force imparting electrode 184 is disposed at both outer peripheries of the pixel electrode 84 along both sides of the pixel electrode 84 in the vertical direction. The tilt driving force applying electrode 184 is formed in parallel with the data line 62 and overlaps the data line 62 entirely, and is formed on the same layer as the pixel electrode 84. The data line 62 according to the present exemplary embodiment has a horizontal electric field with the fine electrodes 84_1, 84_2, 84_3, and 84_4 when the driving voltage is applied due to the black matrix 121 and the color filter 131 formed of the organic material disposed thereon. Can not form. Accordingly, the tilt driving force applying electrode 184 is disposed on the black matrix 121 to form a horizontal electric field with the fine electrodes 84_1, 84_2, 84_3 and 84_4 when the driving voltage is applied, thereby connecting the liquid crystal 310 to the pattern 96. Tilt to the side.

Hereinafter, a liquid crystal display according to a modification of the second embodiment of the present invention will be described in detail with reference to FIGS. 9 and 10. 9 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a modification of the second exemplary embodiment of the present invention. FIG. 10 is a cross-sectional view of a liquid crystal display including a thin film transistor array panel taken along line F-F ′ of the thin film transistor array panel of FIG. 9.

9 and 10, the liquid crystal display according to the present modification also uses the thin film transistor array panel 101 ′ in which the color filter 121 ′ and the like are formed on the thin film transistor array, as in the second embodiment of the present invention. It may be a containing COA structure.

The data lines 62 of the present modification are arranged one per pixel electrode 84 along one side of the pixel electrode 84 in the longitudinal direction.

The black matrix 121 'may be made of, for example, a metal (metal oxide) such as chromium (Cr) or chromium oxide, an organic black resist, or the like. In addition, the black matrix 121 'may be formed to overlap the data lines.

The tilt driving force imparting electrodes 184'_1 and 184'_2 of the present modification may be disposed between the pixel electrode 84 and the data line 62 so as not to overlap the data line 62. In detail, the tilt driving force applying electrodes 184'_1 and 184'_2 are disposed to be spaced apart by a predetermined interval along both sides of the vertical direction of one pixel electrode 84. The data line 62 is disposed to be spaced apart from the first tilt driving force applying electrode 184'_1 by a predetermined interval. In other words, the first tilt driving force applying electrode 184 ′ _1 is disposed between the first fine electrode 84_1, the fourth fine electrode 84_4, and the data line 62. The second tilt driving force applying electrode 184'_2 is disposed along one longitudinal direction of the pixel electrode 84 to be spaced apart from the second fine electrode 84_2 and the third fine electrode 84_3 by a predetermined interval. As such, the tilt driving force applying electrodes 184'_1 and 184'_2 are formed so as not to overlap with the data line 62, thereby giving the tilt driving force to the liquid crystal 310 without being subject to voltage distortion by the data line 62. have.

Hereinafter, a liquid crystal display according to a third exemplary embodiment of the present invention will be described in detail with reference to FIG. 11. 11 is a layout view of a thin film transistor array panel included in a liquid crystal display according to a third exemplary embodiment of the present invention.

Referring to FIG. 11, the pixel electrode 86 of the present exemplary embodiment may include a first connection pattern 97_1 arranged substantially in parallel with the first direction on the uppermost surface of the quadrant which divides the pixel electrode 86 into four equal parts in the horizontal direction. The second connection pattern 97_2 is included. The first connection pattern 97_1 and the second connection pattern 97_2 may be alternately arranged alternately. A third connection pattern 97_3 and a fourth connection pattern 97_4 are arranged on the second to fourth surfaces of the quadrant that divides the pixel electrode 86 into four equally in the horizontal direction. One end of the first connection pattern 97_1 and the second connection pattern 97_2 may be connected to the third connection pattern 97_3 and the fourth connection pattern 97_4 in a V shape. The first connection pattern 97_1, the second connection pattern 97_2, and the third connection pattern 97_3 are respectively disposed on the second and bottom surfaces from the bottom of the quadrant that divides the pixel electrode 86 into four in the horizontal direction. And the fourth connection pattern 97_4 are disposed.

A plurality of first fine electrodes 86_1 substantially arranged side by side in the second direction are connected to the first connection pattern 97_1, and a plurality of first fine electrodes 86_1 arranged substantially side by side in the second direction are connected to the first connection pattern 97_1. The second fine electrode 86_2 is connected. Here, the first direction and the second direction may be substantially perpendicular. Specifically, the first direction is substantially 45 ° with respect to the polarization axis of the polarizing plate formed on the first insulating substrate 10. In this case, the liquid crystals (not shown) are oriented toward the first connection pattern 97_1 in parallel with the arrangement direction of the first fine electrode 86_1 to face each other with respect to the first connection pattern 97_1. In addition, the second direction may be substantially 135 ° with respect to the polarization axis of the polarizing plate formed on the first insulating substrate 10. In this case, the liquid crystals are oriented toward the second connection pattern 97_2 in parallel to the arrangement direction of the second fine electrodes 86_2 to face each other. That is, the alignment directions of the liquid crystals are opposite to each other in a portion where the first fine electrode 86_1 and the second fine electrode 86_2 are adjacent to each other. The width of the first fine electrode 86_1 and the second fine electrode 86_2 may be 3 to 5 μm, and the first fine slit 87_1 is disposed between the adjacent first fine electrodes 86_1 and the first fine electrode 86_1. The electrodes 86_1 and the first fine slits 87_1 may be alternately disposed. The second fine slits 87_2 may be disposed between the adjacent second fine electrodes 86_2, and the second fine electrodes 86_2 and the second fine slits 87_2 may be alternately disposed. Widths of the first fine electrode 86_1 and the first fine slit 87_1 may be substantially the same. Similarly, the widths of the second fine electrode 86_2 and the second fine slit 87_2 may be substantially the same.

The first fine electrode 86_1 is bidirectionally branched around the first connection pattern 97_1, and the second fine electrode 86_2 is bidirectionally branched around the second connection pattern 97_2. In this case, the first microelectrode 86_1 and the second microelectrode 86_2 face each other at substantially 3 to 5 μm apart.

The pixel electrode 86 is connected to the third connection pattern 97_3 and the fourth connection pattern 97_4 and the third connection pattern 97_3 and the fourth connection pattern 97_4, which are arranged substantially parallel to each other in the second direction. Each may further include a third microelectrode 86_3 and a fourth microelectrode 86_4 that are arranged substantially in parallel with each other in the first direction. A third fine slit 87_3 and a fourth fine slit 87_4 are disposed between each of the third fine electrodes 86_3 and the fourth fine electrodes 86_4.

The lengths of the fine electrodes 86_1, 86_2, 86_3, and 86_4 of the present exemplary embodiment may not exceed (0.5) ^3/2 times the horizontal length of the pixel electrode 86. As such, the liquid crystal (not shown) disposed on the pixel electrode 86 having a short length is connected to the connection patterns 97_1, 97_2, 97_3, and 97_4 connected to the fine electrodes 86_1, 86_2, 86_3, and 86_4 when the driving voltage is applied. The image may be rapidly tilted, and thus, an inverse domain may not be formed in the liquid crystal display, and thus an afterimage may be prevented.

In addition, the widths of the fine electrodes 86_1, 86_2, 86_3, and 86_4 may become narrower as they move away from the connection patterns 97_1, 97_2, 97_3, and 97_4. Accordingly, the liquid crystal may be more easily tilted toward the connection patterns 97_1, 97_2, 97_3 and 97_4 when the driving voltage is applied.

Although the embodiments and modifications of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments and modifications, but may be manufactured in various forms, and the present invention belongs to the present invention. Those skilled in the art will appreciate that it can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments and modifications described above are exemplary in all respects and not restrictive.

As described above, in the liquid crystal display according to the exemplary embodiments, the response speed may be improved by shortening the length of the fine electrode or by arranging the tilt driving force applying electrode.

Claims (23)

A first insulating substrate; A pixel electrode formed on the first insulating substrate and including a plurality of domain groups composed of a plurality of domains, each of the domains comprising a plurality of fine electrodes arranged substantially parallel to each other in a predetermined direction; A second insulating substrate facing the first insulating substrate; A common electrode formed on the second insulating substrate and not patterned; And It includes a liquid crystal layer interposed between the first and second insulating substrate, And the maximum length of the fine electrode does not exceed (0.5) ^3/2 times the horizontal length of the pixel electrode. The method of claim 1, The domains adjacent to each other are connected by a first connection pattern, and the domain groups adjacent to each other are connected by a second connection pattern. The method of claim 1, And a pair of polarizing plates formed on the first insulating substrate and the second insulating substrate, respectively, wherein the polarization axes of the pair of polarizing plates are perpendicular to each other, and the fine electrodes of the polarizing plates formed on the first insulating substrate. A liquid crystal display comprising substantially 45 °, 135 °, 225 °, and 315 ° in each domain with respect to the polarization axis. The method of claim 1, The width of the fine electrode is narrower as the distance from the connection pattern. The method of claim 1, A data line formed in the vertical direction on the first insulating substrate in a lower layer than the pixel electrode; And And a tilt driving force imparting electrode which is formed in parallel with the data line so that the pixel electrode is divided into two in the vertical direction and imparts a tilt driving force to the liquid crystal included in the liquid crystal layer when a driving voltage is applied. The domain group is disposed on both sides of the tilt driving force applying electrode. The method of claim 5, And a black matrix or a color filter interposed between the first insulating substrate and the data line. The method of claim 6, Further comprising a protective film formed between the data line and the fine electrode made of an inorganic film, And the tilt driving force imparting electrode is formed on the same layer as the data line. The method of claim 7, wherein The data line forms a horizontal electric field with the microelectrode to impart a tilt driving force to the liquid crystal, and the liquid crystal on the domain group disposed between the tilt driving force applying electrode and the data line is connected to the first connection when a driving voltage is applied. A liquid crystal display device tilted toward the pattern side. The method of claim 6, Further comprising a protective film formed between the data line and the fine electrode made of an organic film, The tilt driving force imparting electrode is formed on the upper layer than the protective film. The method of claim 9, And an additional tilt driving force imparting electrode formed on the same layer as the microelectrode so as to overlap the data line in parallel. The method of claim 10, The additional tilt driving force imparting electrode forms a horizontal electric field with the microelectrode to impart a tilt driving force to the liquid crystal, and the liquid crystal on the domain group disposed between the tilt driving force imparting electrode and the additional tilt driving force imparting electrode is a driving voltage. The liquid crystal display device tilts toward the first connection pattern side when applied. A data line formed in a longitudinal direction on the first insulating substrate; A pair of tilt driving force applying electrodes formed in parallel with the data line and overlapping the data line; A pixel electrode disposed between the pair of tilt driving force-providing electrodes, the pixel electrode being divided into a plurality of domains, each domain including a plurality of fine electrodes arranged substantially side by side in a predetermined direction; A second insulating substrate facing the first insulating substrate; A common electrode formed on the second insulating substrate and not patterned; And It includes a liquid crystal layer interposed between the first and second insulating substrate, The liquid crystal layer may include a liquid crystal that receives a tilt driving force from the tilt driving force applying electrode when a driving voltage is applied. The method of claim 12, And a black matrix or a color filter disposed on the upper layer than the data line. The method of claim 13, And one or more pairs of the data lines per pixel electrode along both sides of the pixel electrode, and the black matrix overlaps the data lines. The method of claim 14, And the tilt driving force applying electrode is disposed on the black matrix so as to completely overlap the data line. The method of claim 13, And one data line per one pixel electrode along one side of the pixel electrode, and the black matrix overlaps the data line. The method of claim 16, And the tilt driving force applying electrode is disposed between the fine electrode and the data line so as not to overlap the data line. A pixel electrode comprising first and second connection patterns arranged substantially in parallel in a first direction, and a plurality of first and second fine electrodes arranged in a second direction and connected to the first and second connection patterns, respectively. The plurality of first and second micro electrodes may include pixel electrodes arranged substantially parallel to each other; A second insulating substrate facing the first insulating substrate; A common electrode formed on the second insulating substrate and not patterned; And It includes a liquid crystal layer interposed between the first and second insulating substrate, The maximum length of the first and second fine electrodes is not more than (0.5) ^3/2 times the horizontal length of the pixel electrode. The method of claim 18, The first and second connection patterns are disposed in quadrants that divide the pixel electrode into four equal parts in the horizontal direction. The method of claim 19, And a first direction and a second direction that are substantially perpendicular to each other. The method of claim 19, The width of the first and second fine electrodes is narrower as the width of the first and second fine electrodes increases from the first and second connection patterns. The method of claim 19, The pixel electrode may include third and fourth connection patterns arranged substantially parallel to each other in the second direction, and may be arranged in the first direction and connected to the third and fourth connection patterns, respectively. A liquid crystal display further comprising third and fourth fine electrodes. The method of claim 22, One end of the first and second connection patterns is connected to one end of the second and fourth connection patterns, respectively, and has a V shape.

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