KR101296621B1 - Liquid Crystal Display Device And Method For Fabricating The Same - Google Patents

Abstract

The present invention applies the IPS mode to the R, G, B sub-pixels among the R, G, B, and W pixels, and applies the FFS mode, which is known to have a higher aperture ratio than the IPS mode, to the conventional IPS mode. The present invention relates to a liquid crystal display device and a method for manufacturing the same, which improves transmission characteristics than the designed case and lowers the Clc and Cst values than the case of the conventional FFS mode, and is advantageous for large panel applications. Gate wiring and data wiring vertically crossing the substrate to define the R, G, B, W sub-pixels; A thin film transistor disposed at an intersection point of the gate line and the data line; A common wiring parallel to the gate wiring; A common electrode and a first pixel electrode formed on the R, G, and B sub-pixels and forming a transverse electric field in parallel with each other; A counter electrode formed on the W sub-pixel in a plate shape and a second pixel electrode insulated from the counter electrode and having a plurality of slits; And a counter substrate facing the substrate and a liquid crystal layer interposed between the substrate and the counter substrate, wherein the R, G, and B sub-pixels are formed by the common electrode and the first pixel electrode formed on the same layer. Driven by an electric field, the W sub-pixel is driven by a fringe electric field by the counter electrode and the second pixel electrode insulated from each other.

FFS, IPS, Opening Rate

Description

Liquid Crystal Display Device and Method for Manufacturing the Same {Liquid Crystal Display Device And Method For Fabricating The Same}

1 is a plan view of a conventional IPS mode liquid crystal display device.

2 is a plan view of a H-IPS mode liquid crystal display device according to the prior art.

3 is a plan view of a conventional FFS mode liquid crystal display device.

4 is a graph showing the capacitance of the liquid crystal display device according to the prior art.

5 is a plan view of a liquid crystal display device according to a first embodiment of the present invention.

6 is a plan view of a liquid crystal display device according to a second embodiment of the present invention.

7A to 7C are plan views illustrating the process of the liquid crystal display device according to the present invention.

* Explanation of symbols on the main parts of the drawings

112: gate wiring 112a: gate electrode

114: semiconductor layer 115: data wiring

115a: source electrode 115b: drain electrode

117: first pixel electrode 118: second pixel electrode

123: counter electrode 124: common electrode

125: common wiring 160: slit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device (LCD), and more particularly, to a liquid crystal display device having a maximum liquid crystal efficiency in all regions of a pixel by combining an IPS mode and an FFS mode, and a manufacturing method thereof.

In recent years, active matrix liquid crystal display devices have been widely used in flat panel TVs, portable computers, monitors, and the like, as their performance is rapidly developed.

Among the active matrix liquid crystal display devices, twisted nematic (TN) type liquid crystal display devices are mainly used. In the twisted nematic method, electrodes are installed on two substrates and the liquid crystal directors are arranged to be twisted 90 degrees, It is a technique of driving a liquid crystal director by applying a voltage to an electrode.

Twisted nematic liquid crystal display devices are spotlighted for providing excellent contrast and color reproducibility, but suffer from the chronic problem of narrow viewing angles.

In order to solve the viewing angle problem of the TN method, an IPS mode (In-Plane Switching Mode) for forming two electrodes on one substrate and controlling the director of the liquid crystal with a transverse electric field generated between the two electrodes has been introduced.

Subsequently, in order to improve the low aperture ratio and transmittance of the IPS mode, a fringe formed between the counter electrode and the pixel electrode by forming a narrow gap between the counter electrode and the pixel electrode while forming the counter electrode and the pixel electrode as a transparent conductor. FFS mode (Fringe Field Switching) for operating the liquid crystal molecules by the field has emerged.

Hereinafter, the IPS mode liquid crystal display device and the FFS mode liquid crystal display device will be described in detail. Hereinafter, the thin film transistor array substrate of the liquid crystal display device will be described in detail.

1 is a plan view of an IPS mode liquid crystal display device according to the prior art, FIG. 2 is a plan view of an H-IPS mode liquid crystal display device according to the prior art, and FIG. 3 is a plan view of an FFS mode liquid crystal display device according to the prior art.

First, as shown in FIGS. 1 and 2, the IPS mode liquid crystal display includes a gate line 12 and a data line 15 that vertically intersect to define a unit pixel, and an intersection of the gate line and the data line. A thin film transistor TFT formed at a point and a common electrode 25 and a pixel electrode 17 are formed to cross each other so as to be parallel to each other to generate a transverse electric field.

In this case, the common electrode 25 is integrally formed with the common wiring 25 parallel to the gate wiring 12 to receive a voltage outside the active region.

As described above, the IPS mode liquid crystal display device forms liquid crystal molecules by forming a common electrode 24 and a pixel electrode 17 on the same substrate and applying a voltage between the two electrodes to generate a horizontal electric field in the horizontal direction with respect to the substrate. It is characterized in that the rotating to the horizontal state with respect to the substrate.

Such an IPS mode liquid crystal display device is classified into AS-IPS and H-IPS (Horizental-IPS) depending on whether the pixel electrode 24 and the common electrode 17 are arranged in the data wiring direction or the gate wiring direction. As shown in FIG. 1, in the case of the AS-IPS in which the pixel electrode 24 and the common electrode 17 are disposed in the direction of the data line 15, the aperture ratio of 45% is shown in FIG. 2. As described above, in the case of the H-IPS in which the pixel electrode 24 and the common electrode 17 are arranged in the direction of the gate wiring 12, the opening ratio is 52%.

In the FFS mode liquid crystal display device, as shown in FIG. 3, a gate line 512 and a data line 515 and a gate line 512 are formed of an opaque metal and vertically cross each other to define pixels. A common wiring 525 arranged in parallel to the semiconductor substrate, a thin film transistor (TFT) for switching voltage on / off at the intersection of the two wirings, a transparent metal, insulated by an insulating film, and overlapping each other in the pixel The counter electrode 524 and the pixel electrode 517 are formed. In this case, the counter electrode 524 and the common wiring 525 are in contact with each other.

In detail, the counter electrode 524 is formed in a plate shape in the pixel area, and the pixel electrode 517 is formed such that a slit 560 exists between the pixel electrodes branched and branched in the data wiring direction. At this time, the Vcom signal is transmitted to the counter electrode 524, and the pixel voltage passing through the thin film transistor is transferred to the pixel electrode 517, thereby generating a fringe field between the counter electrode 524 and the pixel electrode 517. .

The width of the slit 560 is approximately 2 to 6 μm, and the liquid crystal is driven by the fringe field formed between the pixel electrode 517 and the counter electrode 524. That is, when voltage is not applied, the liquid crystals that are initially oriented by rubbing rotate by the fringe field to transmit light.

The FFS mode liquid crystal display device exhibits an aperture ratio of 60%, which is higher than that of the IPS mode liquid crystal display device.

On the other hand, the IPS mode liquid crystal display device and the FFS mode liquid crystal display device, in addition to arranging the sub-pixels of R, G, and B, the sub-pixels of the white pattern (W) that do not contain a pigment are further configured to R, G. One pixel can be formed by arranging B, W pixels, and the R, G, and B sub-pixels form a color filter layer containing pigments, so that the transmittance is lowered, whereas the W sub-pixels do not contain pigments. Since it does not fall, the transmittance of all the pixels is improved.

At this time, according to the arrangement of the R, G, B, and W pixels, a quad type in which the sub-pixels of R, G, B, and W are arranged in a square shape so that four sub-pixels constitute one pixel, or Sub-pixels of R, G, B, and W may be sequentially arranged to have a stripe type pixel structure in which four sub-pixels constitute one pixel. In this case, the quad type AS-IPS and the stripe type AS-IPS have an opening ratio of 39% and 41%, respectively, and the quad type H-IPS and the stripe type H-IPS have an opening ratio of 45% and 46%, respectively. The quad type FFS mode and the stripe type FFS mode exhibit aperture ratios of 50% and 51%, respectively.

The liquid crystal display device according to the prior art as described above had the following problems.

That is, when comparing the aperture ratios of the elements, as described above, the H-IPS having the electrodes arranged horizontally was superior to the AS-IPS having the electrodes arranged in the longitudinal direction, and the aperture ratio of the FFS mode was better than that of the IPS mode. Characteristics.

However, as shown in FIG. 4, which is a graph showing the capacitance of the liquid crystal display device, in the case of the FFS mode liquid crystal display device, the Clc value (capacitance capacitance) and the Cst (storage capacitance) value are compared with other modes such as IPS mode and VA mode. This was a big problem. In particular, when the pixel size is large but the resolution is not large, such as a TV, in order to secure the charging characteristics, the TFT size and the size of the wiring have to be increased, so that an opening ratio (transmittance) is lowered.

The present invention has been made to solve the above problems, and among the R, G, B, and W pixels, the IPS mode is applied to the R, G, and B sub-pixels, and the aperture ratio of the W sub-pixel is higher than that of the IPS mode. By applying known FFS mode, the liquid crystal display device and its manufacture to improve the transmission characteristics than the design in the conventional IPS mode, and to lower the Clc and Cst value than the design in the conventional FFS mode to favor large panel applications The purpose is to provide a method.

The liquid crystal display device of the present invention for achieving the above object is a gate wiring and data wiring defining a sub-pixel of R, G, B, W by vertically crossing on a substrate, and the intersection of the gate wiring and data wiring A thin film transistor disposed on the substrate, a common wiring parallel to the gate wiring, a common electrode and a first pixel electrode provided in the R, G, and B sub-pixels to form a transverse electric field in parallel with each other, and the W sub- And a counter electrode provided in the entire pixel, a second pixel electrode insulated from the counter electrode, and having a plurality of slits, an opposing substrate facing the substrate, and a liquid crystal layer interposed between the two substrates.

In addition, the manufacturing method of the liquid crystal display device of the present invention for achieving the object of the present invention comprises the steps of forming a gate wiring and a common wiring on the substrate, forming a gate insulating film on the entire surface including the gate wiring, Forming a data line on the gate insulating film to define R, G, B, and W sub-pixels intersecting with the gate line, forming a thin film transistor at an intersection of the gate line and the data line; Forming a protective film on the entire surface including the data line, forming a counter electrode in the W sub-pixel, forming a common electrode in the R, G, and B sub-pixels, and forming a thin film transistor in the thin film transistor. A first pixel electrode parallel to the common electrode in the R, G, and B sub-pixels, and a second pixel electrode having a plurality of slits in the W sub-pixel; It characterized by comprising the step of sex.

That is, in the liquid crystal display device in which one pixel is formed by four sub-pixels of R, G, B, and W, IPS mode is applied to the R, G, and B sub-pixels, and IPS mode is used for the W sub-pixel. It is characterized by applying an FFS mode known to have a high aperture ratio.

As described above, the device according to the present invention combines the advantages of FFS and IPS to maximize the transmission characteristics, and basically adopts a quad type or stripe type R, G, B, W pixel structure, To maximize the advantages, we adopt FFS mode on the white sub-pixel and H-IPS structure on the remaining R, G, B sub-pixels to increase the aperture ratio characteristic of IPS mode and storage of FFS disadvantage. Complement the characteristics with each other.

Hereinafter, a liquid crystal display device and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

5 is a plan view of a liquid crystal display device according to a first embodiment of the present invention, FIG. 6 is a plan view of a liquid crystal display device according to a second embodiment of the present invention, and FIGS. 7A to 7C are liquid crystal displays according to the present invention. It is a top view for demonstrating the process of an element.

First, in the thin film transistor array substrate of the liquid crystal display according to the present invention, as shown in FIGS. 5 and 6, sub-pixels of R, G, B, and W are vertically intersected, and a gate insulating film (not shown) is used. Gate wiring 112 and data wiring 115 which are insulated from each other by the?), Common wiring 125 parallel to the gate wiring 112, thin film transistor formed at the intersection of the gate wiring and the data wiring; And a common electrode 124 and a first pixel electrode 117 formed in the R, G, and B sub-pixels to form a transverse electric field, and a counter electrode 123 formed in the W sub-pixel to form a fringe field. ) And the second pixel electrode 118 are formed.

Although not shown, the thin film transistor array substrate 111 is bonded to the color filter array substrate including the black matrix and the color filter layer with the liquid crystal layer interposed therebetween. At this time, the R, G, B sub-pixels are formed by applying and patterning a color resist colored with the pigments of R, G, and B, and the W sub-pixels are formed by applying and patterning a resist that is not colored with the pigment. In some cases, the W sub-pixel may be realized by forming a color filter layer in the R, G, and B sub-pixels and not forming a separate color filter layer pattern in the W sub-pixel.

Specifically, in the W sub-pixel, the plate-type counter electrode 123 formed by contacting the common wiring 125 to be applied with the Vcom voltage and having a passage through the entire W sub-pixel, and the drain electrode of the thin film transistor ( A second pixel electrode 118 having a plurality of slits 160 is formed by being contacted with the pixel voltage and being insulated from the counter electrode 123, between the counter electrode and the second pixel electrode through the slit. A fringe field is formed in the liquid crystal layer to drive the liquid crystal layer.

In this case, the counter electrode 123 and the second pixel electrode 118 may be formed of a transparent conductive layer, and the counter electrode may be provided under the gate wiring layer or above the data wiring layer. When the counter electrode is provided on the data line, the counter electrode is formed on a protective film formed on the entire surface including the data line, and an interlayer insulating film is formed on the counter electrode to insulate the second pixel electrode.

A common electrode 124 is formed in the R, G, and B sub-pixels to contact the common wiring 125 to apply a Vcom voltage, and to contact the drain electrode 115b of the thin film transistor to form a pixel voltage. A first pixel electrode 117 applied and parallel to the common electrode is formed, and a transverse electric field is formed between the common electrode and the first pixel electrode parallel to each other to drive the liquid crystal layer.

In this case, the common electrode 124 may be provided on the same layer as the gate line or on the same layer as the first pixel electrode 117, and the second pixel electrode of the W sub-pixel and R, G The first pixel electrode of the B sub-pixel is provided on the same layer.

As described above, the device according to the present invention forms the counter electrode and the second pixel electrode in the W subpixel to drive the liquid crystal layer in the FFS mode, and forms the common electrode and the first pixel electrode in the R, G, and B subpixels to form the IPS. By driving the liquid crystal layer in the mode, the disadvantages of the IPS mode with low aperture ratio and the FFS mode with increased storage are compensated for each other. In particular, an opening ratio increase of 2% or more compared to the conventional IPS mode was achieved.

At this time, the R, G, B, W sub-pixels are arranged in a quad type in which the sub-pixels of R, G, B, and W are arranged in a 2x2 structure, or as shown in FIG. As shown in FIG. 5, the sub-pixels of R, G, B, and W may be arranged in a stripe type in which they are regularly arranged side by side.

Meanwhile, the AS-IPS structure can be applied by arranging the common electrode and the first pixel electrode of the R, G, and B sub-pixels, and the second pixel electrode slit of the W sub-pixel in the gate wiring direction. In order to maximize the aperture ratio, as shown in FIGS. 5 and 6, the common electrode 124 and the first pixel electrode 117 of the R, G, and B sub-pixels, and the second pixel electrode of the W sub-pixel, are illustrated. The slit 160 may be disposed in the direction of the data line 115 to apply the H-IPS structure.

The common electrode and the first pixel electrode of the R, G, and B sub-pixels, and the second pixel electrode slit of the W sub-pixel are inclined at a predetermined angle from the gate wiring and data wiring directions to secure the wide viewing angle of the device. Can be placed.

However, the common electrode and the first pixel electrode of the R, G, and B sub-pixels, and the second pixel electrode slit of the W sub-pixel are arranged in the same direction, so that the entire R, G, B, and W sub-pixels are disposed. The liquid crystals are arranged in the same direction.

On the other hand, the thin film transistor serves to control the on / off of the voltage, the thin film transistor is formed on the front surface including the gate electrode 112a branched from the gate wiring 112, and the gate wiring 112. A semiconductor layer 114 formed by depositing amorphous silicon (a-Si) on a gate insulating layer, a gate insulating layer on the gate electrode, and a source / drain branched from the data line 115 to be formed on the semiconductor layer. It consists of electrodes 115a and 115b.

Looking more specifically through the manufacturing method is as follows.

First, as shown in FIG. 7A, a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) is deposited on the entire surface of an insulating substrate and patterned to remain in the W sub-pixel to form a plate-type counter electrode 123. ).

Subsequently, metals such as copper (Cu), aluminum (Al), aluminum alloy (AlNd: Aluminum Neodymium), molybdenum (Mo), and molybdenum-tungsten (MoW) having low resistivity on the front surface of the counter electrode 123 may be formed. After deposition, patterning is performed to form the gate wiring 112, the gate electrode 112a, and the common wiring 125.

In this case, the common wiring 125 is formed to be parallel to the gate wiring 112 and formed to be in contact with the counter electrode 123.

Next, an inorganic insulating material such as silicon oxide (SiOx) or silicon nitride (SiNx) is generally deposited on the entire surface including the gate wiring 112 by a plasma enhanced chemical vapor deposition (PECVD) method. A gate insulating layer is formed, amorphous silicon is deposited on the entire surface including the gate insulating layer, and patterned by photolithography to form a semiconductor layer 114 on the gate electrode 112a.

Subsequently, as shown in FIG. 7B, copper (Cu), aluminum (Al), aluminum alloy (AlNd: Aluminum Neodymium), molybdenum (Mo), and molybdenum-tungsten (MoW) are formed on the entire surface including the semiconductor layer 114. The low-resistance metal, such as a metal, is deposited and then patterned to form the data line 115 and the source / drain electrodes 115a and 115b.

The data line 115 is formed to cross the gate line 112 to define sub-pixels of R, G, B, and W, and the source / drain electrodes 115a and 115b are formed on the semiconductor layer 114. A thin film transistor is completed by forming overlapping ends.

Here, the sub-pixels of R, G, B, and W may be arranged in a quad type having a 2 × 2 structure, or may be arranged in a stripe type in which sub-pixels of R, G, B, and W are regularly arranged side by side. have.

Subsequently, an inorganic material such as silicon nitride or silicon oxide is deposited on the entire surface including the data line 115 or an organic material such as BCB or acrylic resin is applied to form a protective film (not shown), and a thin film transistor is formed. The protective layer may be selectively removed to expose the drain electrode of the first contact hole 151, and at the same time, the gate insulating layer and the protective layer may be selectively removed to expose a predetermined portion of the common wiring 125 to the second contact hole ( 152).

Subsequently, as illustrated in FIG. 7C, a transparent conductive material such as ITO or IZO is deposited on the entire surface including the passivation layer and then patterned to form a common electrode 124 on the R, G, and B sub-pixels. And forming a first pixel electrode 117 parallel to the common electrode in the R, G, and B sub-pixels, and at the same time, a second pixel electrode 118 having a plurality of slits 160 in the W sub-pixels. ).

In this case, the common electrode 124 is formed to be in contact with the common wiring 125 through the second contact hole 152, and the first pixel electrode 117 and the W sub of the R, G, and B sub-pixels. The second pixel electrode 118 of the pixel is formed to be connected to the drain electrode 115b of the thin film transistor through the first contact hole 151. However, in the case of the common electrode, the gate electrode may be formed simultaneously with the gate wiring without being formed simultaneously with the first and second pixel electrodes. In this case, the common electrode may be integrally formed with the common wiring.

Thus, the common electrode 124 and the first pixel electrode 117 parallel to each other are formed in the R, G, and B sub-pixels to form the IPS mode, and the plate-type counter electrode 123 and the slit are formed in the W sub-pixel. The second pixel electrode 118 is formed to be in the FFS mode.

The common electrode 124 and the first pixel electrode 117 of the R, G, and B sub-pixels, and the second pixel electrode slit 160 of the W sub-pixel are formed in a gate wiring or data wiring direction. In order to secure a wide viewing angle, the light line may be formed in an oblique direction to be inclined at a predetermined angle from the gate wiring and data wiring directions.

In addition, the common electrode and the first pixel electrode of the R, G, and B sub-pixels, and the second pixel electrode slit of the W sub-pixel are formed in the same direction, so that the R, G, B, and W sub-pixels are driven during liquid crystal driving. The liquid crystals are driven in the same direction.

On the other hand, the common electrode 124 may be formed simultaneously with the gate wiring instead of simultaneously with the pixel electrode.

The counter electrode may be formed to be insulated from the pixel electrode on a protective film formed on the entire surface including the data line, in addition to the method of forming the substrate on the substrate before forming the gate line as in the above-described embodiment. Can be. In other words, a plate type counter electrode is formed on the passivation film, an interlayer insulating film is formed thereon, and a pixel electrode having slits is formed on the interlayer insulating film.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

The liquid crystal display device and its manufacturing method according to the present invention as described above has the following effects.

First, the conventional IPS mode is designed by applying the IPS mode to the R, G, B sub-pixels among the R, G, B, and W pixels, and applying the FFS mode, which is known to have a higher aperture ratio than the IPS mode, to the W sub-pixel. It is possible to improve the transmission characteristics than in one case.

Therefore, the transmittance is also increased overall and the brightness is also brightened, so that the image quality of the liquid crystal display device is improved.

Second, only the W sub-pixels of the R, G, B, and W sub-pixels are applied to the FFS mode, and the IP, S, sub-pixels are applied to the R, G, B, and W sub-pixels. And Cst values can be lowered.

Therefore, in the case of forming a large sub-pixel size in a large panel, it is not necessary to increase the TFT size and wiring size in order to secure the charging characteristic, which is advantageous for large panel applications.

Third, the liquid crystal display device according to the present invention basically adopts a quad type or stripe type R, G, B, W pixel structure, and has an FFS mode having excellent transmittance to white sub-pixels. The advantage of permeation can be maximized by adopting the H-IPS structure, which is applied to the R, G and B sub-pixels and has excellent transmittance characteristics.

Claims (21)

Gate wiring and data wiring vertically crossing the substrate to define the R, G, B, W sub-pixels; A thin film transistor disposed at an intersection point of the gate line and the data line; A common wiring parallel to the gate wiring; A common electrode and a first pixel electrode formed on the R, G, and B sub-pixels and forming a transverse electric field in parallel with each other; A counter electrode formed on the W sub-pixel in a plate shape and a second pixel electrode insulated from the counter electrode and having a plurality of slits; And It comprises an opposing substrate facing the substrate and a liquid crystal layer interposed between the substrate and the opposing substrate, The R, G, and B sub-pixels are driven by a transverse electric field formed by the common electrode and the first pixel electrode formed on the same layer, and the W sub-pixel is driven by the counter electrode and the second pixel electrode insulated from each other. A liquid crystal display device driven by a fringe electric field. The method of claim 1, And the R, G, B, and W sub-pixels are arranged in a quad type or a stripe type. The method of claim 1, And the common and first pixel electrodes of the R, G, and B sub-pixels, and the second pixel electrode slits of the W sub-pixel are disposed in the same direction. The method of claim 1, The common electrode and the first pixel electrode of the R, G, and B sub-pixels, and the second pixel electrode slit of the W sub-pixel are collectively arranged in the gate wiring direction or collectively in the data wiring direction. A liquid crystal display device characterized by the above-mentioned. 5. The method of claim 4, Characterized in that the common electrode and the first pixel electrode of the R, G, and B sub-pixels, and the second pixel electrode slit of the W sub-pixel are collectively inclined at an angle from the gate wiring or data wiring direction. Liquid crystal display device. The method of claim 1, And the first and second pixel electrodes and the counter electrode are transparent conductive layers. The method of claim 1, And the common electrode is formed on the same layer as the first pixel electrode and is in contact with the common wiring. delete The method of claim 1, And the first pixel electrode of the R, G, and B sub-pixels and the second pixel electrode of the W sub-pixel are provided in the same layer. delete Forming a gate wiring and a common wiring on the substrate; Forming a gate insulating film on the entire surface of the substrate including the gate wiring; Forming data wirings on the gate insulating film to define R, G, B, and W sub-pixels intersecting with the gate wirings; Forming a thin film transistor at an intersection of the gate line and the data line; Forming a protective film on an entire surface of the substrate including the data wires; Forming a plate-shaped counter electrode on the W sub-pixel; Forming a common electrode having a plurality of slits in the R, G, B sub-pixels; Forming a first pixel electrode having a plurality of slits parallel to the common electrode in the R, G, and B sub-pixels; And Forming a second pixel electrode insulated from the counter electrode and having a plurality of slits in the W sub-pixel; The R, G, and B sub-pixels are driven by a transverse electric field formed by the common electrode and the first pixel electrode formed on the same layer, and the W sub-pixel is driven by the counter electrode and the second pixel electrode insulated from each other. A method of manufacturing a liquid crystal display device, which is driven by a fringe electric field. The method of claim 11, And the R, G, B, and W sub-pixels are arranged in a quad type or a stripe type. The method of claim 11, Fabrication of a liquid crystal display device characterized in that the arrangement direction of the common electrode and the first pixel electrode of the R, G, B sub-pixels and the arrangement direction of the second pixel electrode slit of the W sub-pixel are coincident with each other. Way. The method of claim 11, A common electrode and a first pixel electrode of the R, G, and B sub-pixels, and a second pixel electrode slit of the W sub-pixel are collectively formed in the gate wiring direction or collectively in the data wiring direction. A method of manufacturing a liquid crystal display device, characterized in that. 15. The method of claim 14, And forming a common electrode and a first pixel electrode of the R, G, and B sub-pixels, and a second pixel electrode slit of the W sub-pixel, collectively inclined at an angle from the gate wiring and data wiring directions. Method of manufacturing a liquid crystal display device. The method of claim 11, The first and second pixel electrodes and the counter electrode are formed of a transparent conductive material. The method of claim 11, And the common electrode is formed at the same time as the first pixel electrode and is in contact with the common wiring. delete The method of claim 11, And the counter electrode is formed before the forming of the gate line. The method of claim 11, And the counter electrode is formed to be insulated from the second pixel electrode on the passivation layer. The method of claim 11, And a first pixel electrode of the R, G, and B sub-pixels and a second pixel electrode of the W sub-pixel are formed at the same time.

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