KR20070000239A - Ips mode liquid crystal display device and method of manufacturing the same - Google Patents

Abstract

An IPS(In-Plane Switching) mode LCD and a method for manufacturing the same are provided to greatly decrease the widths of a common electrode and a pixel electrode, by surrounding a patterned insulating layer with an electrode layer and then etching an upper portion of the electrode layer. A first insulating layer(110) having a predetermined pattern is formed on a substrate(100). An electrode layer is formed to surround the first insulting layer. A second insulating layer is formed on the resultant substrate including the electrode layer. The second insulating layer is ashed to expose an upper surface of the electrode layer. The exposed electrode layer is etched to form common electrodes(200a) and pixel electrodes(200b) in parallel with one another. The common and pixel electrodes are disposed between the first insulating layer and the second insulating layer.

Description

IPS mode liquid crystal display device and method of manufacturing the same

The present invention relates to a liquid crystal display device, and more particularly to an IPS mode liquid crystal display device.

Ultra-thin flat panel display devices having a thickness of only a few centimeters of the display screen, and liquid crystal display devices (Liquid Crystal Display Device) mainly have a wide range of applications, such as notebook computers, monitors, aircraft.

The liquid crystal display device includes a liquid crystal layer formed between the lower substrate, the upper substrate, and both substrates. The liquid crystal display device is a flat panel display device in which an arrangement of the liquid crystal layers is changed according to voltage application, and accordingly, light transmittance is adjusted to display an image. .

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

1 is a schematic perspective view of a conventional liquid crystal display device, which corresponds to a so-called twisted nematic (TN) mode liquid crystal display device. 1A shows a state where no voltage is applied, and FIG. 1B shows a state where a voltage is applied.

First, the structure of the conventional TN mode liquid crystal display device will be briefly described, and then the driving principle thereof will be described.

The conventional TN mode liquid crystal display device includes a liquid crystal layer 5 between the first substrate 1, the second substrate 3, and both substrates 1, 3.

A first polarizing plate 7 having a transmission axis in a predetermined direction is formed on an outer surface of the first substrate 1, and a second transmission plate having a transmission axis in a direction opposite to the first polarizing plate is formed on an outer surface of the second substrate 3. The polarizing plate 9 is formed.

Although not shown, a pixel electrode is formed on the first substrate 1, and a common electrode is formed on the second substrate 3, so that a vertical electric field is formed between the pixel electrode and the common electrode. .

In the state where no voltage is applied as in FIG. 1A, the liquid crystal layer 5 is arranged in a twisted 90 degree state between the first substrate 1 and the second substrate 3. Herein, when light 10 is incident through the second polarizing plate 9, the light is transmitted through the liquid crystal layer 5. At this time, the liquid crystal molecules are twisted and transmitted 90 degrees in the same manner as the liquid crystal molecules that are twisted by 90 degrees. Will pass through. Thus, the image is in a white state.

In the state where a voltage is applied as shown in FIG. 1B, the liquid crystal molecules forming the liquid crystal layer 5 are vertically arranged between the substrates 1 and 3 by a vertical electric field between the pixel electrode and the common electrode. Herein, when the light 10 is incident through the second polarizing plate 9, the light 10 is transmitted through the liquid crystal layer 5. In this case, rotation of the polarization direction of the light is not performed, and thus the light 10 may not pass through the first polarizing plate 7. Thus, the image is in a black state.

However, such a TN mode liquid crystal display device has a big disadvantage that the viewing angle is narrow.

2 is a diagram illustrating a viewing angle problem of a TN mode liquid crystal display device.

2A is a white display state without a voltage, FIG. 2B is a black display state with a full voltage applied, and FIG. 2C is an intermediate display state with an intermediate voltage applied thereto.

As shown in FIG. 2A, in the state where no voltage is applied, the liquid crystal molecules 5 are twisted at a fine inclination angle in the same direction, and the incident light (shown by the arrow) displays white in any direction.

As shown in FIG. 2B, in the state where the full voltage is applied, the liquid crystal molecules 5 are oriented vertically under the influence of the electric field, and the incident light does not twist and displays black.

As shown in FIG. 2C, the liquid crystal molecules 5 are oriented in an oblique direction in a state where an intermediate voltage is applied, and thus the display state is different according to the direction of incident light. That is, the light incident from the lower right to the upper left does not change the polarization direction of the light, and thus displays black, whereas the light incident from the lower left to the upper right shows the polarized direction of the light at a twisted white.

As described above, the TN mode liquid crystal display device has a disadvantage in that the display state is different according to the incident direction of light and thus the viewing angle is narrow.

Accordingly, researches to broaden the viewing angle have been actively conducted, and various methods have been proposed as part of the research. For example, a so-called IPS (In Plane Switching) mode using a horizontal electric field, an alienated VA (Vertical Alignment) mode using a vertical alignment film, an electrically controlled Birefringence (ECB) mode, etc. have been proposed. A multidomain method using an average value of an array and a phase compensation method of changing a phase difference according to a change in a viewing angle using a phase difference film have been proposed.

The present invention relates to an IPS mode liquid crystal display device among various methods for widening the viewing angle as described above. Hereinafter, the conventional IPS mode liquid crystal display device will be described in more detail.

3 is a view of a conventional IPS mode liquid crystal display device, and FIGS. 3A and 3B are cross-sectional views and a plan view, respectively, without a voltage applied, and FIGS. 3C and 3D are cross-sectional views and a plan view, respectively, with a voltage applied thereto.

First, the structure of the conventional IPS mode liquid crystal display device will be briefly described, and then the driving principle thereof will be described.

The conventional IPS mode liquid crystal display device includes a liquid crystal layer 5 between the first substrate 1, the second substrate 3, and both substrates 1, 3.

A first polarizing plate 7 having a transmission axis in a predetermined direction is formed on an outer surface of the first substrate 1, and a second transmission plate having a transmission axis in a direction opposite to the first polarizing plate is formed on an outer surface of the second substrate 3. The polarizing plate 9 is formed.

Further, the pixel electrode 2 and the common electrode 4 are formed in parallel with each other on the first substrate 1, so that a horizontal electric field is formed between the pixel electrode 2 and the common electrode 4.

In the state where no voltage is applied as shown in FIGS. 3A and 3B, the liquid crystal layer 5 is substantially horizontal with respect to the longitudinal direction of the electrodes 2 and 4 between the first substrate 1 and the second substrate 3. Are arranged. In this case, when the light 10 is incident through the first polarizing plate 7, the light is transmitted through the liquid crystal layer 5, in which the rotation of the polarization direction of the light is not performed so that the transmission axis is opposite to the first polarizing plate 7. It cannot pass through the second polarizing plate 9. Thus, the image is in a black state.

In the state where a voltage is applied as shown in FIGS. 3C and 3D, the liquid crystal layer 5 is arranged differently in the vicinity of the first substrate 1 and in the vicinity of the second substrate 3. That is, in the vicinity of the first substrate 1, the second substrate 3 is arranged in a direction perpendicular to the longitudinal direction of the electrodes 2 and 4 by a horizontal electric field between the pixel electrode 2 and the common electrode 4. ), The electric field is less affected, and is arranged in the horizontal direction with respect to the longitudinal direction of the electrodes 2 and 4 as in the case of no voltage application.

Accordingly, when the light 10 is incident through the first polarizing plate 7, the light is transmitted through the liquid crystal layer 5, and the light is twisted and transmitted like the twisted liquid crystal molecules. Passes through the second polarizing plate (9) opposite. Thus, the image is in a white state.

As described above, since the IPS mode liquid crystal display device switches horizontally without vertically aligning the liquid crystal molecules, the viewing angle characteristic does not change according to the incident direction of light even when an intermediate voltage is applied.

However, the IPS mode liquid crystal display device has a problem in that transmittance is small by forming the pixel electrode 2 and the common electrode 4 on the first substrate 1.

The reason why the transmittance is small is that the aperture ratio decreases by the width of the pixel electrode 2 and the common electrode 4. Currently, the width of the pixel electrode 2 and the common electrode 4 is about 4 μm, which is the minimum thickness that can be formed by the photolithography process. In the case of using the photolithography process, the pixel electrode 2 and the There is a limit in reducing the width of the common electrode 4.

The present invention was devised to solve the above problems, and a first object of the present invention is to provide a method of manufacturing an IPS mode liquid crystal display device which can improve aperture ratio by significantly reducing the width of a pixel electrode and a common electrode by applying a new process. To provide.

A second object of the present invention is to provide an IPS mode liquid crystal display device having an improved aperture ratio by significantly reducing the width of the pixel electrode and the common electrode.

The present invention is a first step of patterning a first insulating layer in a predetermined shape on a substrate in order to achieve the first object; A second step of patterning the electrode layers for the common electrode and the pixel electrode to surround the first insulating layer; Forming a second insulating layer on the entire surface of the substrate; A fourth process of ashing the second insulating layer to expose the electrode layer on the first insulating layer; And a fifth process of etching the exposed electrode layer to form a common electrode and a pixel electrode which are vertically formed between the first insulating layer and the second insulating layer and arranged in parallel with each other. It provides a manufacturing method.

The present inventors studied a method of greatly reducing the width of the pixel electrode and the common electrode in order to improve the aperture ratio in the IPS mode liquid crystal display device, and after forming the electrode layer to surround the patterned insulating layer, the electrode layer on the upper insulating layer In the present invention, the electrode layer remaining on the side of the insulating layer is applied as a common electrode and a pixel electrode when the electrode layer remains only on the side of the insulating layer by etching.

The second process may include patterning the electrode layers for the common electrode and the pixel electrode so as to surround the first insulating layer and extend a predetermined distance to the surface of the substrate.

In the fourth step, the second insulating layer may be ashed to expose the upper and predetermined electrode layers of the first insulating layer.

The present invention provides a first substrate and a second substrate facing each other and provided with a pixel region in order to achieve the second object; A liquid crystal layer formed between the substrates; First and second insulating layers alternately formed in the pixel area on the first substrate; The present invention provides an IPS mode liquid crystal display device including a common electrode and a pixel electrode formed vertically between the first insulating layer and the second insulating layer and arranged in parallel with each other.

The height of the common electrode and the pixel electrode, the height of the first insulating layer, and the height of the second insulating layer may be variously changed.

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

1. Manufacturing method of IPS mode liquid crystal display device

First embodiment

4A to 4E are cross-sectional views illustrating a manufacturing process of an IPS mode liquid crystal display device according to a first embodiment of the present invention, in which a pixel electrode and a common electrode are formed in a unit pixel region of an IPS mode liquid crystal display device. It shows the bay. Other portions may be modified in various ways known in the art.

First, as shown in FIG. 4A, the first insulating layer 110 is patterned on a substrate 100 in a predetermined shape.

The first insulating layer 110 may be made of an inorganic insulating material such as SiOx, SiNx, or may be made of an organic insulating material such as benzocyclobutene (BCB) or polyvinyl alcohol (Polyvinylalcohol), and an inorganic insulating material and an organic insulating material. It may be made of a double layer of.

Thereafter, as shown in FIG. 4B, the common electrode and the pixel electrode electrode layer 200 are patterned to surround the first insulating layer 110.

The material of the electrode layer 200 may be a transparent metal such as ITO or an opaque metal such as Mo or Ti.

Pattern formation of the electrode layer 200 may be performed using a photolithography process, but is not necessarily limited thereto.

Thereafter, as shown in FIG. 4C, a second insulating layer 130 is formed on the entire surface of the substrate.

Since the second insulating layer 130 should be formed flat on the entire surface of the substrate, an organic insulating material such as benzocyclobutene (BCB) and polyvinyl alcohol (polyvinyl alcohol) is preferable.

Thereafter, as illustrated in FIG. 4D, the second insulating layer 130 is ashed to expose the electrode layer 200 on the first insulating layer 110. The ashed second insulating layer is denoted by reference numeral 130a.

The ash treatment may be performed using an oxygen plasma.

On the other hand, in the ash processing of the second insulating layer 130, it is possible to expose only the electrode layer 200 on the first insulating layer 110 by ashing to the reference point h1, but by ashing to the reference point h2 It is also possible to expose the electrode layer 200 on the upper side and the predetermined side of the first insulating layer 110.

Thereafter, as illustrated in FIG. 4E, the exposed electrode layer 200 is etched. Then, the common electrode 200a and the pixel electrode 200b are formed between the first insulating layer 110 and the ashed second insulating layer 130a.

The cross-sections of the common electrode 200a and the pixel electrode 200b are perpendicular to the side surfaces of the insulating layers 110 and 130a, respectively, and are arranged in parallel with each other when viewed in plan view.

The etching process may be performed through a dry etching process using an etching gas or a wet etching process using an etching solution.

Meanwhile, although only the exposed electrode layer 200 is etched in FIG. 4E, the electrode layer 200 may be additionally etched due to the penetration of the etching solution or the etching solution. That is, due to the additional etching, the heights of the common electrode 200a and the pixel electrode 200b may be smaller than the height of the first insulating layer 110 and the second insulating layer 130a. Although the height is small, there is no influence on the horizontal electric field induced between the common electrode 200a and the pixel electrode 200b, so that there is no influence on the driving of the liquid crystal display device.

As described above, according to the process of FIGS. 4A to 4E, the width (length X in FIG. 4E) of the common electrode 200a and the pixel electrode 200b is the same as the thickness of the electrode layer 200 formed in FIG. 4B. It is possible to form, eventually forming in the range of 0.03 to 0.1㎛. Therefore, the aperture ratio is greatly improved.

Meanwhile, as described above, only the pixel electrode and the common electrode are formed in the unit pixel region in FIGS. 4A to 4E. In the unit pixel region, the gate line and the data line intersecting each other, and the gate line and The thin film transistor is formed at the intersection of the data lines.

Specific methods of forming the gate line, the data line, and the thin film transistor may be performed by various methods known in the art.

4A to 4E illustrate only a process of forming a substrate on which a pixel electrode and a common electrode are formed. In the IPS liquid crystal display device, the substrate and the opposing substrate facing the substrate are bonded to each other with a liquid crystal layer interposed therebetween. do.

In this case, the counter substrate is manufactured by sequentially forming a light shielding layer for weaving light leakage, and a color filter layer of red, blue, and green.

In addition, a spacer may be further formed on one of the above substrates to maintain a cell gap of the liquid crystal display device.

In addition, an alignment layer may be further formed on at least one of the above substrates for the initial alignment of liquid crystals. The alignment layer may be formed by rubbing alignment treatment using a polyamide or polyimide compound, PVA (polyvinylalcohol), polyamic acid, or the like, or PVCN (polyvinylcinnamate) or PSCN (polyvinylcinnamate). It may be formed by photo-alignment treatment using a photoreactive material such as polysiloxanecinnamate) or CelCN (cellulosecinnamate) compound.

On the other hand, there are a vacuum injection method and a liquid crystal dropping method as a method of forming a liquid crystal layer between both substrates.

The vacuum injection method is a method of injecting the liquid crystal through a predetermined injection hole after the two substrates are bonded, the liquid crystal dropping method is a method of bonding both substrates after dropping the liquid crystal on any one of the two substrates. Since the vacuum injection method takes a long time to inject the liquid crystal when the size of the substrate is large, the productivity is decreased, so the liquid crystal dropping method is preferable.

Second embodiment

5A to 5E are cross-sectional views illustrating a manufacturing process of an IPS mode liquid crystal display device according to a second exemplary embodiment of the present invention, in which a pixel electrode and a common electrode are formed in a unit pixel region of the IPS mode liquid crystal display device. Only the appearance is shown, other parts may be modified in various ways known in the art.

In the method of manufacturing the IPS mode liquid crystal display device according to the second embodiment of the present invention, in forming the electrode layer 200 for the common electrode and the pixel electrode in the process of FIG. 5B, the electrode layer 200 is formed of the first insulating layer 110. It is the same as the method according to the first embodiment described above, except that the pattern is formed to extend at a predetermined distance on the surface of the substrate 100 at the same time. Therefore, like reference numerals refer to like parts. It demonstrates below.

First, as shown in FIG. 5A, the first insulating layer 110 is patterned on a substrate 100 in a predetermined shape.

Thereafter, as shown in FIG. 5B, the common electrode and the pixel electrode electrode layer 200 are patterned so as to surround the first insulating layer 110 and extend a predetermined distance to the surface of the substrate 100.

Thereafter, as shown in FIG. 5C, a second insulating layer 130 is formed on the entire surface of the substrate.

Thereafter, as illustrated in FIG. 5D, the second insulating layer 130 is ashed to expose the electrode layer 200 on the first insulating layer 110.

On the other hand, in the ash processing of the second insulating layer 130, it is possible to expose only the electrode layer 200 on the first insulating layer 110 by ashing to the reference point h1, but by ashing to the reference point h2 It is also possible to expose the electrode layer 200 on the upper side and the predetermined side surface of the first insulating layer 110 as in the first embodiment described above.

Thereafter, as illustrated in FIG. 5E, the exposed electrode layer 200 is etched. Then, the common electrode 200a and the pixel electrode 200b are formed between the first insulating layer 110 and the ashed second insulating layer 130a.

The cross-sections of the common electrode 200a and the pixel electrode 200b are perpendicular to the side surfaces of the insulating layers 110 and 130a and extend a predetermined distance to the surface of the substrate 100, respectively. Are arranged.

Meanwhile, although only the exposed electrode layer 200 is etched in FIG. 5E, the electrode layer 200 may be additionally etched due to the penetration of an etching solution or an etching solution, which is the same as the first embodiment described above.

As described above, the width (length X in FIG. 5E) of the common electrode 200a and the pixel electrode 200b may be formed to be 0.1 to 2 μm or less according to the process of FIGS. 5A to 5E. Therefore, the aperture ratio is greatly improved.

Details of each process, and the details of the other processes are the same as the first embodiment described above will be omitted.

2. IPS mode liquid crystal display device

Third embodiment

6A through 6D are cross-sectional views of an IPS mode liquid crystal display device according to a third embodiment of the present invention. 6A to 6D illustrate only the formation of the pixel electrode and the common electrode in the unit pixel area of the IPS mode liquid crystal display device, which is manufactured by the method of manufacturing the IPS mode liquid crystal display device according to the first embodiment described above. The various forms of the liquid crystal display device manufactured are shown.

As can be seen in Figures 6a to 6d, the IPS mode liquid crystal display device according to the present invention is a liquid crystal formed between the first substrate 100 and the second substrate 300 facing each other, and the two substrates (100, 300) Layer 400.

The first insulating layer 110 and the second insulating layer 130a are alternately formed on the first substrate 100.

The common electrode 200a and the pixel electrode 200b are arranged between the first insulating layer 110 and the second insulating layer 130a. The cross-sections of the common electrode 200a and the pixel electrode 200b are perpendicular to the side surfaces of the insulating layers 110 and 130a, respectively, and are arranged in parallel with each other when viewed in plan view.

In this case, the heights of the common electrode 200a, the pixel electrode 200b, the first insulating layer 110, and the second insulating layer 130a may be variously changed as shown in FIGS. 6A to 6D.

As shown in FIG. 6A, the heights of the common electrode 200a and the pixel electrode 200b may be the same as the heights of the first insulating layer 110 and the second insulating layer 130a. The structure as shown in FIG. 6A is obtained by exposing only the electrode layer 200 on the first insulating layer 110 by ashing the second insulating layer 130 to the reference point h1 in FIG. 4D.

As shown in FIG. 6B, the heights of the common electrode 200a and the pixel electrode 200b are the same as the height of the second insulating layer 130a and are different from the height of the first insulating layer 110. Can be. The structure shown in FIG. 6B is obtained when the second insulating layer 130 is ashed to the reference point h2 in FIG. 4D described above to expose the upper portion of the first insulating layer 110 and the electrode layer 200 on the predetermined side surface.

As shown in FIG. 6C, the heights of the common electrode 200a and the pixel electrode 200b are different from the heights of the first insulating layer 110 and the second insulating layer 130a and the first insulating layer 100. The height of the second insulating layer 130a may be the same. 6C is obtained when the electrode layer 200 is additionally etched due to the penetration of an etchant or an etchant in FIG. 4E after the ashing of the second insulating layer 130 to the reference point h1 in FIG. 4D. .

As shown in FIG. 6D, the heights of the common electrode 200a and the pixel electrode 200b, the height of the first insulating layer 100a, and the height of the second insulating layer 130a may be different from each other. . 6D is obtained when the electrode layer 200 is additionally etched due to the penetration of an etchant or an etchant in FIG. 4E after the ashing of the second insulating layer 130 to the reference point h2 in FIG. 4D. .

In this case, the material of the common electrode 200a and the pixel electrode 200b may be a transparent metal such as ITO or an opaque metal such as Mo or Ti.

In addition, the width X of the common electrode 200a and the pixel electrode 200b is in a range of 0.03 to 0.1 μm.

Although not shown, a gate line and a data line are formed on the first substrate 100 to cross each other to define a pixel region, and a thin film transistor is formed at an intersection of the gate line and the data line.

A light blocking layer 310 is formed on the second substrate 300 to prevent leakage of light, and red, green, and blue color filter layers 320 are formed thereon.

Although not shown, the two substrates 100 and 300 are sealed by a sealing material, and spacers are formed between the substrates 100 and 300 in order to maintain a cell gap of the liquid crystal display device. The spacer may be a ball-shaped ball spacer or a columnar column spacer.

In addition, an alignment layer for initial alignment of liquid crystals is formed on at least one of the substrates 100 and 300.

In addition, although not specifically described, various components other than the common electrode 200a and the pixel electrode 200b which are the core of the present invention may be changed by various methods known to those skilled in the art.

Fourth embodiment

7A to 7D are cross-sectional views of an IPS mode liquid crystal display device according to a fourth embodiment of the present invention. 7A to 7D illustrate various forms of liquid crystal display devices manufactured by the method of manufacturing the IPS mode liquid crystal display device according to the second embodiment described above.

As shown in FIGS. 7A to 7D, the IPS mode liquid crystal display device according to the present invention includes a liquid crystal formed between the first substrate 100 and the second substrate 300 facing each other, and the substrates 100 and 300. Layer 400.

The first insulating layer 110 and the second insulating layer 130a are alternately formed on the first substrate 100.

The common electrode 200a and the pixel electrode 200b are arranged between the first insulating layer 110 and the second insulating layer 130a. The cross-sections of the common electrode 200a and the pixel electrode 200b are perpendicular to the side surfaces of the insulating layers 110 and 130a and extend a predetermined distance to the surface of the substrate 100, respectively. Are arranged.

In this case, the heights of the common electrode 200a, the pixel electrode 200b, the first insulating layer 110, and the second insulating layer 130a may be variously changed as shown in FIGS. 7A to 7D.

As shown in FIG. 7A, the heights of the common electrode 200a and the pixel electrode 200b may be the same as the heights of the first insulating layer 110 and the second insulating layer 130a. The structure shown in FIG. 7A is obtained when only the electrode layer 200 on the first insulating layer 110 is exposed by ashing the second insulating layer 130 to the reference point h1 in FIG. 5D.

As shown in FIG. 7B, the heights of the common electrode 200a and the pixel electrode 200b are the same as the height of the second insulating layer 120a and are different from the height of the first insulating layer 110. Can be. The structure shown in FIG. 7B is obtained when the second insulating layer 130 is ashed to the reference point h2 in FIG. 5D described above to expose the upper portion of the first insulating layer 110 and the electrode layer 200 on the predetermined side surface.

As shown in FIG. 7C, the heights of the common electrode 200a and the pixel electrode 200b are different from the heights of the first insulating layer 110 and the second insulating layer 130a and the first insulating layer 100. The height of the second insulating layer 130a may be the same. The structure shown in FIG. 7C is obtained when the electrode layer 200 is additionally etched due to the penetration of an etchant or an etchant in FIG. 5E after the ashing of the second insulating layer 130 to the reference point h1 in FIG. 5D. .

As shown in FIG. 7D, the heights of the common electrode 200a and the pixel electrode 200b, the height of the first insulating layer 100a, and the height of the second insulating layer 130a may be different from each other. . 7D is obtained when the electrode layer 200 is additionally etched due to the penetration of an etchant or an etchant in FIG. 5E after ashing the second insulating layer 130 to the reference point h2 in FIG. 5D. .

Other details are the same as the above-described third embodiment, so a detailed description thereof will be omitted.

According to the present invention having the above-described configuration, the common electrode and the pixel electrode can be formed in the range of 0.03 to 0.1 µm or less, or 0.1 to 2 µm or less, and the aperture ratio is greatly improved as compared with the prior art, thereby improving the transmittance.

1A and 1B are diagrams schematically illustrating a state in which no voltage is applied and a state in which a voltage is applied in a conventional twisted nematic (TN) mode liquid crystal display device, respectively.

FIG. 2 illustrates a problem in that a narrow viewing angle is formed in a conventional TN mode liquid crystal display device. FIG. 2A illustrates a white display state without a voltage, FIG. 2B shows a black display state with a full voltage applied, and FIG. 2C shows an intermediate voltage. It is a figure which shows the intermediate display state which applied.

3 is a view of a conventional IPS mode liquid crystal display device, and FIGS. 3A and 3B are cross-sectional views and a plan view, respectively, without a voltage applied, and FIGS. 3C and 3D are cross-sectional views and a plan view, respectively, with a voltage applied thereto.

4A to 4E are cross-sectional views illustrating a manufacturing process of an IPS mode liquid crystal display device according to a first embodiment of the present invention.

5A to 5E are cross-sectional views illustrating a manufacturing process of an IPS mode liquid crystal display device according to a second embodiment of the present invention.

6A through 6D are cross-sectional views of an IPS mode liquid crystal display device according to a third embodiment of the present invention.

7A to 7D are cross-sectional views of an IPS mode liquid crystal display device according to a fourth embodiment of the present invention.

<Description of Signs of Major Parts of Drawing>

100: substrate 110: first insulating layer

130 and 130a: second insulating layer 200: electrode layer

200a and 200b: common electrode and pixel electrode

Claims (19)

A first step of forming a pattern of a first insulating layer on a substrate in a predetermined shape; A second step of patterning the electrode layers for the common electrode and the pixel electrode to surround the first insulating layer; Forming a second insulating layer on the entire surface of the substrate; A fourth process of ashing the second insulating layer to expose the electrode layer on the first insulating layer; And a fifth process of etching the exposed electrode layer to form a common electrode and a pixel electrode which are formed vertically between the first insulating layer and the second insulating layer and arranged in parallel with each other. Manufacturing method. The method of claim 1, The second process is a method of manufacturing an IPS mode liquid crystal display device, characterized in that the electrode layer for the common electrode and the pixel electrode is patterned so as to surround the first insulating layer and extend a predetermined distance to the surface of the substrate. The method according to claim 1 or 2, And in the fourth process, ashing the second insulating layer to expose the electrode layers on the upper side and the predetermined side surface of the first insulating layer. The method according to claim 1 or 2, The fourth process is a method of manufacturing an IPS mode liquid crystal display device, characterized in that performed using oxygen plasma. The method of claim 1, Forming a gate line and a data line on the substrate to cross each other; And And forming a thin film transistor in an intersection region of the gate line and the data line. The method of claim 5, Preparing an opposing substrate facing the substrate and having a light shielding layer and a color filter layer thereon; And A method of manufacturing an IPS mode liquid crystal display device, further comprising the step of forming a liquid crystal layer between the both substrates. The method of claim 6, Forming a liquid crystal layer between the both substrates Dropping a liquid crystal layer onto any one of the above substrates; And A method of manufacturing an IPS mode liquid crystal display device, characterized in that the step of bonding both the substrates. A first substrate and a second substrate facing each other and provided with pixel regions; A liquid crystal layer formed between the substrates; First and second insulating layers alternately formed in the pixel area on the first substrate; An IPS mode liquid crystal display device including a common electrode and a pixel electrode formed vertically between the first insulating layer and the second insulating layer and arranged in parallel with each other. The method of claim 8, And the common electrode and the pixel electrode are further formed on the surface of the first substrate by a predetermined distance. The method according to claim 8 or 9, The height of the common electrode and the pixel electrode is the same as the height of the first insulating layer and the second insulating layer liquid crystal display device. The method according to claim 8 or 9, The height of the common electrode and the pixel electrode is the same as the height of the second insulating layer, and different from the height of the first insulating layer. The method according to claim 8 or 9, The height of the common electrode and the pixel electrode is different from the height of the first insulating layer and the second insulating layer, the height of the first insulating layer and the second insulating layer is the IPS mode liquid crystal display device. The method according to claim 8 or 9, The height of the common electrode and the pixel electrode, the height of the first insulating layer, and the height of the second insulating layer are different from each other. The method of claim 8, The width of the common electrode and the pixel electrode is 0.03 to 0.1 ㎛ or less characterized in that the IPS mode liquid crystal display device. The method of claim 9, The width of the common electrode and the pixel electrode is less than 0.1 to 2 ㎛ IPS mode liquid crystal display device. The method according to claim 8 or 9, And the common electrode and the pixel electrode are made of a transparent metal or an opaque metal. The method according to claim 8 or 9, A gate line and a data line formed on the first substrate to cross each other; And And a thin film transistor formed at an intersection of the gate line and the data line. The method according to claim 8 or 9, And a light blocking layer and a color filter layer formed on the second substrate. The method according to claim 8 or 9, And a spacer for maintaining a cell gap between the first substrate and the second substrate.