KR20040063621A - Color filter substrate and liquid crystal display having the same - Google Patents

Abstract

PURPOSE: A color filter substrate and an LCD(Liquid Crystal Display) having the same are provided to prevent an error operation of a gate driving circuit by reducing a parasitic capacitance generated between the gate driving circuit and a common electrode. CONSTITUTION: A common electrode(240) is formed on a color filter(220). A protective film(252) is formed on the common electrode(240) to correspond to the entire driving part(PA). The protective film(252) protects the driving part(PA). The protective film(252) is formed as a photosensitive organic insulation film having a dielectric constant which is less than a dielectric constant of a liquid crystal layer(300). A cell gap holding member(251) formed in a display part(DA) separates the array substrate(100) and a color filter substrate(200).

Description

COLOR FILTER SUBSTRATE AND LIQUID CRYSTAL DISPLAY HAVING THE SAME}

The present invention relates to a color filter substrate and a liquid crystal display having the same, and more particularly, to a color filter substrate capable of improving display quality and a liquid crystal display having the same.

1 is a cross-sectional view illustrating a general liquid crystal display, and FIG. 2 is an output waveform diagram of the gate driver shown in FIG. 1. However, in the graph shown in FIG. 2, the x axis represents time and the y axis represents voltage.

Referring to FIG. 1, a general liquid crystal display device 40 includes an array substrate 10, a color filter substrate 20, and a liquid crystal layer interposed between the color filter substrate 20 and the array substrate 10. 30). The liquid crystal display device 40 displays an image while changing an arrangement angle of the liquid crystal layer 30 by an electric field formed between the color filter substrate 20 and the array substrate 10 by a signal from the outside. Display.

The array substrate 10 includes a display area DA and a peripheral area PA adjacent to the display area DA. The display area DA includes a plurality of pixels in a matrix form. Each of the plurality of pixels includes a gate line, a data line, a thin film transistor (hereinafter, referred to as a TFT) 11 connected to the gate line and the data line, and a pixel electrode 12 coupled to the TFT 11. .

In the peripheral area PA, a gate driving circuit 16 for applying a driving voltage to the gate line is formed by the TFT process. As such, by integrating the gate driving circuit 16 on the array substrate 10, the number, volume, and size of the assembly process of the liquid crystal display device 40 may be reduced.

The color filter substrate 20 is provided with a common electrode 24 facing the pixel electrode 20 with the liquid crystal layer 30 therebetween. The cell gap holding member 25 is provided on the common electrode 24 to maintain the cell gap of the liquid crystal display 40 corresponding to the display area DA.

Since the common electrode 24 also faces the gate driving circuit 16 with the liquid crystal layer 30 interposed therebetween, the parasitic capacitance between the gate driving circuit 16 and the common electrode 24 is increased. C) is generated.

In FIG. 2, the solid line represents the normal waveform A1 and the dotted line represents the waveform A2 distorted by the parasitic capacitance C. In FIG. As shown in FIG. 2, the highest voltage in the distorted waveform A2 was about 5V lower than the highest voltage in the normal waveform A1.

As a result, the parasitic capacitance C distorts or delays the signal output from the gate driving circuit 16, thereby lowering the display characteristics of the liquid crystal display 40. FIG.

In addition, when an external force is applied to the peripheral area PA of the liquid crystal display 40, the common electrode 24 and the gate driving circuit 16 are shorted and malfunction of the gate driving circuit 16 is caused. Cause.

Accordingly, a first object of the present invention is to provide a color filter substrate which is employed in a liquid crystal display device to improve the display quality of the liquid crystal display device.

Further, a second object of the present invention is to provide a liquid crystal display device having the color filter substrate.

1 is a cross-sectional view showing a general liquid crystal display device.

FIG. 2 is an output waveform diagram of the gate driver shown in FIG. 1.

3 is a cross-sectional view showing in detail a transmissive liquid crystal display according to an exemplary embodiment of the present invention.

4 is a plan view of the array substrate shown in FIG. 3.

FIG. 5 is a plan view of the color filter substrate shown in FIG. 3.

6A through 6D are views illustrating a manufacturing process of the color filter substrate illustrated in FIG. 3.

7 is a cross-sectional view of a transflective liquid crystal display according to another exemplary embodiment of the present invention.

8 is a cross-sectional view illustrating in detail the display area illustrated in FIG. 7.

9 is a cross-sectional view showing in detail a display area of a transflective liquid crystal display according to another exemplary embodiment of the present invention.

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

100: array substrate 110: TFT

120 pixel electrode 160 gate driving circuit

200: color filter substrate 210: light shielding film

220: color filter 240: common electrode

251: cell gap holding member 252: protective film

300: liquid crystal layer 400: transmissive liquid crystal display device

According to an aspect of the present invention, there is provided a color filter substrate including: an array substrate having a display unit for displaying an image and a driving unit provided around the display unit to provide a driving signal to the display unit; And display an image through the liquid crystal layer therebetween.

The color filter substrate may include a color filter; A transparent electrode formed on the color filter; And a protective film provided on the transparent electrode so as to generally correspond to the driving part.

In addition, the liquid crystal display device according to the present invention for achieving the second object of the present invention comprises: an array substrate having a display unit for displaying an image and a driving unit provided around the display unit for providing a drive signal to the display unit; A color filter substrate comprising a color filter, a common electrode provided on the color filter, and a protective film provided on the common electrode generally corresponding to the driving part to protect the driving part; And a liquid crystal layer interposed between the array substrate and the color filter substrate.

According to the color filter substrate and the liquid crystal display having the same, a protective film is provided on the common electrode so as to correspond to the driving part as a whole to protect the driving part. Therefore, malfunction of the driving unit can be prevented, thereby improving display characteristics of the liquid crystal display device.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

3 is a cross-sectional view showing in detail a transmissive liquid crystal display according to an exemplary embodiment of the present invention. 4 is a plan view of the array substrate shown in FIG. 3, and FIG. 5 is a plan view of the color filter substrate shown in FIG.

3 and 4, a transmissive liquid crystal display device 400 according to an exemplary embodiment of the present invention includes an array substrate 100, a color filter substrate 200 facing the array substrate 100, and the array substrate. The liquid crystal layer 300 is interposed between the 100 and the color filter substrate 200.

The array substrate 100 includes a display area DA displaying an image and a peripheral area PA adjacent to the display area DA.

The display area DA includes a plurality of pixels in a matrix form. Each of the plurality of pixels is coupled to the TFT 110 and the TFT 110 connected to a data line DL extending in a first direction and a gate line GL extending in a second direction perpendicular to the first direction. And a pixel electrode 120 made of a transparent conductive material. In detail, the TFT 110 has a configuration in which a gate electrode is connected to the gate line GL, a source electrode is connected to the data line DL, and a drain electrode is connected to the pixel electrode 120.

As shown in FIG. 3, a first organic insulating layer 130 is formed between the TFT 110 and the pixel electrode 120 to connect only the drain electrode of the TFT 110 to the pixel electrode 120. It is interposed. The first organic insulating layer 130 is provided with a contact hole 131 for exposing the drain electrode. Thus, the pixel electrode 120 is electrically connected to the drain electrode through the contact hole 131.

In the array substrate 100, an area in which the TFT 110, the data line DL, and the gate line GL are provided is defined as an invalid display area in which an image is not displayed. In addition, an area in which the pixel electrode 120 is provided is defined as an area in which an image is displayed as an effective display area.

The gate driving circuit 160 and the data driving circuit 170 are respectively provided in the array substrate 100 corresponding to the peripheral area PA. The gate driving circuit 160 is connected to one end of the gate line GL through a connection line 165 to provide a gate driving signal to the gate line GL. The gate driving circuit 160 is formed through the same process as the TFT 110 provided in the display area DA and integrated on the array substrate 100. The data driving circuit 170 is connected to one end of the data line DL to provide an image signal to the data line DL. The data driving circuit 170 is provided in a chip form, and when the array substrate 100 is completed, it is assembled on the array substrate 100.

On the other hand, the color filter substrate 200 is provided to correspond to the light shielding film 210 and the effective display area of the array substrate 200 provided in correspondence with the ineffective display area of the array substrate 100, RGB color pixels It comprises a color filter 220 made of.

The light blocking film 210 prevents the TFT 110, the data line DL, and the gate line GL from being projected onto the screen of the transmissive liquid crystal display 400. In addition, the light blocking film 210 may be provided to correspond to the peripheral area PA of the array substrate 100 to prevent the gate driving circuit 160 from being projected onto the screen of the transmissive liquid crystal display device 400.

As shown in FIG. 3, the color filter 220 is provided on the color filter substrate 200 such that each of the R.G.B color pixels corresponds to each of the plurality of pixels provided in the array substrate 100. In addition, each of the R.G.B color pixels partially overlaps the light blocking film 210.

In addition, on the color filter 220 and the light shielding film 210 to protect the color filter 220 and the light shielding film 210, and to reduce the step generated between the light shielding film 210 and the color filter 220. The planarization film 230 is provided. The common electrode 240 made of a transparent conductive material is stacked on the planarization layer 230 to have a uniform thickness.

Meanwhile, a passivation layer 252 and a cell gap holding member 251 are provided on the color filter substrate 200 formed up to the common electrode 240, respectively. In detail, the passivation layer 252 is provided on the common electrode 240 facing the gate driving circuit 160, and the cell gap holding member 251 is disposed on the common electrode 240 in the display area PA. ) Is provided.

The passivation layer 252 entirely covers the common electrode 240 facing the gate driving circuit 160, thereby protecting the gate driving circuit 160. That is, the passivation layer 252 is formed of a photosensitive organic insulating layer having a dielectric constant smaller than that of the liquid crystal layer 300, thereby reducing parasitic capacitance generated between the gate driving circuit 160 and the common electrode 240. You can. On the other hand, the cell gap holding member 251 is interposed between the array substrate 100 and the color filter substrate 200 to maintain the cell gap of the transmissive liquid crystal display device 400 to a predetermined size. The cell gap holding member 251 may be formed of the photosensitive organic insulating layer in the same manner as the passivation layer 252.

As shown in FIGS. 3 and 5, the cell gap holding member 251 is formed in the display area DA so as not to affect the aperture ratio (effective display area / total area) of the transmissive liquid crystal display device 400. It is formed to correspond to the invalid display area. In addition, the cell gap holding member 251 extends in the first direction in which the data line DL extends to have a stripe shape.

The passivation layer 252 has a width sufficient to cover the gate driving circuit 160 as a whole and is provided corresponding to the peripheral area PA. That is, the passivation layer 252 entirely covers the common electrode 240 facing the gate driving circuit 160. As such, the gate driving circuit 160 faces the common electrode 240 with the passivation layer 252 interposed therebetween, so that the passivation layer 252 is the gate driving circuit 160 and the common electrode 240. Parasitic capacitance can be prevented from being generated between

Thereafter, when the array substrate 100 and the color filter substrate 200 are coupled by a coupling member (hereinafter, sealant) 350, the common electrode 240 and the pixel electrode 120 face each other. Thereafter, the liquid crystal layer 300 is interposed between the array substrate 100 and the color filter substrate 200. Thus, the transmissive liquid crystal display device 400 is completed. Therefore, the transmissive liquid crystal display 400 displays an image by changing an arrangement angle of the liquid crystal layer 300 by an electric field formed between the common electrode 240 and the pixel electrode 120.

The transmissive liquid crystal display device 400 having the above structure includes the passivation layer 252 on the color filter substrate 200 corresponding to the peripheral area PA. Here, since the passivation layer 252 has a lower dielectric constant than that of the liquid crystal layer 300, it is possible to prevent generation of parasitic capacitance. In addition, since the distance between the common electrode 240 and the gate driving circuit 160 is maintained at a predetermined interval even by an external force by the passivation layer 252, the parasitic capacitance may be prevented from increasing.

The passivation layer 252 may prevent a short circuit between the common electrode 240 and the gate driving circuit 160 due to an external force, and maintain a cell gap of the transmissive liquid crystal display device 400.

For example, if the parasitic capacitance of the conventional case in which the liquid crystal layer 300 is interposed between the gate driving circuit 160 and the common electrode 240 is 1.03 ㎊, the gate driving circuit 160 and the In the case where the passivation layer 252 is interposed between the common electrode 240, the parasitic capacitance is about 0.34 Ω, which is reduced by about 66.67%. That is, since the parasitic capacitance is proportional to the dielectric constant, the passivation layer 252 having a lower dielectric constant than the liquid crystal layer 300 is interposed between the gate driving circuit 160 and the common electrode 240. The production of parasitic capacitance is reduced.

6A through 6D are views illustrating a manufacturing process of the color filter substrate illustrated in FIG. 3.

Referring to FIG. 6A, a chromium oxide (CrO ₂ ) or organic black matrix (BM) layer is stacked on the color filter substrate 200, and the chromium oxide or organic BM is patterned to display the display area DA. ) And a light shielding film 210 corresponding to the ineffective display area and the peripheral area PA, respectively.

After stacking a first photoresist (not shown) containing a red pigment or dye on the color filter substrate 200 on which the light blocking film 210 is formed, the first photoresist is patterned to form an R color pixel. . Thereafter, a second photoresist (not shown) including a green pigment or dye is coated on the color filter substrate 200, and then the second photoresist is patterned to form a G color pixel. Next, after applying a third photoresist (not shown) including a blue pigment or dye on the color filter substrate 200, the third photoresist is patterned to form a B pixel. As a result, the R.G.B color pixels are sequentially formed on the color filter substrate 200, thereby completing the color filter 220.

Each of the R.G.B color pixels is provided corresponding to an effective display area of the display area DA and partially overlaps the light blocking film 210.

Next, referring to FIG. 6B, a planarization film 230 and a common electrode 240 made of a photosensitive acrylic resin or a polyimide resin are formed on the color filter substrate 200 on which the light blocking film 210 and the color filter 220 are formed. ) Are formed sequentially. The planarization layer 230 is stacked with a predetermined thickness in order to reduce the step difference generated between the light shielding layer 210 and the color filter 220. Therefore, the common electrode 240 may help to have a flat surface structure without being influenced by the light blocking film and the color filters 210 and 220 having steps.

The common electrode 240 is made of Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO) to be deposited on the planarization layer 230 in a uniform thickness.

6C and 6D, on the color filter substrate 200 formed up to the common electrode 240, a second organic insulating layer 260 made of photosensitive acrylic resin is formed to a predetermined thickness. The thickness of the second organic insulating layer 260 determines the cell gap of the transmissive liquid crystal display device 400.

A mask 265 having a pattern corresponding to the cell gap holding member 251 and the passivation layer 252 is formed on the second organic insulating layer 260. In detail, an opening 265a is formed in the mask 265 to correspond to the remaining areas except for the areas where the cell gap holding members and the protective layers 251 and 252 are to be formed. Next, an exposure process is performed while the mask 265 is provided on the second organic insulating layer 260. That is, the second organic insulating layer 260 corresponding to the display area DA is fully exposed in the area corresponding to the opening 265a. On the other hand, since the opening 265a is not formed in the mask 265 provided on the second organic insulating layer 260 corresponding to the peripheral area PA, the exposure is not performed.

Thereafter, when the exposed second organic insulating layer 260 is reacted with a developer, the cell gap holding member 251 is formed in the display area DA, and the protective film 252 is formed in the peripheral area PA. do.

FIG. 7 is a cross-sectional view illustrating a transflective liquid crystal display device according to another exemplary embodiment. FIG. 8 is a cross-sectional view illustrating the display area of FIG. 7 in detail. 7 and 8, the same reference numerals are given to the same components as those illustrated in FIG. 3, and description thereof will be omitted.

7 and 8, a transflective liquid crystal display 500 according to another exemplary embodiment of the present invention may include an array substrate 100, a color filter substrate 200 facing the array substrate 100, and the array. The liquid crystal layer 300 is interposed between the substrate 100 and the color filter substrate 200.

The array substrate 100 includes a display area DA displaying an image and a peripheral area PA adjacent to the display area DA.

As illustrated in FIG. 8, the display area DA includes a TFT 110, and a pixel electrode including a transparent electrode 170 and a reflective electrode 190 connected to the TFT 110. In detail, the TFT 110 including the gate electrode 111, the source electrode 112, and the drain electrode 113 is formed in the display area DA. Thereafter, the transparent electrode 170 made of ITO is connected to the drain electrode 113 of the TFT 110, so that the transparent electrode 170 receives a signal from the drain electrode 113 of the TFT 110.

On the array substrate 100 on which the TFT 110 and the transparent electrode 170 are formed, an organic insulating layer 180 made of a photosensitive acrylic resin is stacked to a predetermined thickness. The organic insulating layer 180 covers a portion where the drain electrode 113 and the transparent electrode 170 are in contact with each other. In addition, an opening window 181 for exposing a portion of the transparent electrode 170 is formed in the organic insulating layer 180. The opening window 181 is formed in the remaining region except for a portion where the TFT 110 and the transparent electrode 170 contact each other. In addition, a plurality of irregularities 185 are provided on the surface of the organic insulating layer 180, thereby improving the reflection efficiency of the reflective electrode 190 stacked on the organic insulating layer 180.

Next, the reflective electrode 190 made of aluminum (Al), silver (Ag), and chromium (Cr) having excellent reflectance is formed on the organic insulating layer 180 with a uniform thickness. In this case, the reflective electrode 190 is electrically connected to the transparent electrode 170 through the opening window 181. Accordingly, the reflective electrode 190 receives a signal applied to the drain electrode 113 of the TFT 110 through the transparent electrode 170.

Since the reflective electrode 190 is in electrical contact with the transparent electrode 170 exposed by the opening window 181, the reflective electrode 190 is connected to the transparent electrode 170 or the drain electrode 113. Since it is not necessary to further form a contact hole for electrically connecting, the reflection efficiency of the reflective electrode 190 can be improved. In addition, since the reflective electrode 190 extends not only on the top surface of the organic insulating layer 180 but also on the sidewall surface and the top surface of the transparent electrode 170, the reflection efficiency of the reflective electrode 190 may be further improved. Can be.

Here, the region where the reflective electrode 190 is formed is defined as a reflective region RA for reflecting the first light L1 incident from the front surface of the transflective liquid crystal display 500. Meanwhile, a region exposed by the reflective electrode 190 among the regions where the transparent electrode 170 is formed is a transmission region for transmitting the second light L2 incident from the rear surface of the transflective liquid crystal display 500. Defined as (TA).

In order to prevent light loss due to polarization characteristics in the transmissive area TA, the transflective liquid crystal display 500 uses the opening window 181 formed in the organic insulating layer 180 to transmit the transmissive area TA. Has a first cell gap D1 and a second cell gap D2 that is twice as large as the first cell gap D1 in the reflection area RA. That is, the transflective liquid crystal display 500 has a double cell gap structure in which the transmission area TA and the reflection area RA have different cell gaps.

On the other hand, the liquid crystal layer 300 is divided into a first liquid crystal (not shown) in contact with the color filter substrate 200 and a second liquid crystal (not shown) adjacent to the array substrate 100. Here, an angle formed by an arrangement direction of the first and second liquid crystals, that is, a long axis direction of the first and second liquid crystals, is defined as a twist angle of the liquid crystal layer 300.

Since the transmissivity of the transflective liquid crystal display 500 decreases as the torsion angle increases, the transflective liquid crystal display 500 may be formed of the transmissive area TA to prevent light loss due to polarization characteristics. One cell gap D1 has a double cell gap twice that of the second cell gap D2 of the reflection area RA. In the transflective liquid crystal display device 500 as described above, the liquid crystal layer 300 is horizontally aligned so that the twist angle is 0 ° in order to improve the transmittance of the transmission area TA.

9 is a cross-sectional view showing in detail a display area of a transflective liquid crystal display according to another exemplary embodiment of the present invention.

Referring to FIG. 9, a pixel electrode, an inorganic insulating film 175, and an organic insulating film including a TFT 110, a transparent electrode 170, and a reflective electrode 190 may be formed on the array substrate 100 corresponding to the display area DA. 180).

In detail, the TFT 110 including the gate electrode 111, the source electrode 112, and the drain electrode 113 is formed on the array substrate 100. Thereafter, the inorganic insulating layer 175 is provided on the first substrate 100 to protect the TFT 110. The inorganic insulating layer 175 is made of a transparent inorganic material such as silicon nitride (SiNx) or chromium oxide (Cr ₂ O ₃ ). A contact hole 175a for exposing the drain electrode 113 is formed in the inorganic insulating layer 175.

Next, a transparent electrode 170 is provided on the inorganic insulating layer 175, and the transparent electrode 170 is electrically connected to the drain electrode 113 through the contact hole 175a. Therefore, the transparent electrode 170 receives a signal applied to the drain electrode 113 of the TFT 110.

On the array substrate 100 on which the TFT 110, the inorganic insulating film 175, and the transparent electrode 170 are formed, an organic insulating film 180 made of a photosensitive acrylic resin is stacked to a predetermined thickness. In addition, an opening window 181 for exposing a portion of the transparent electrode 170 is formed in the organic insulating layer 180. The opening window 181 is formed in the remaining region except for the portion where the TFT 110 and the transparent electrode 170 contact each other, thereby improving the reflection efficiency of the reflective electrode 190.

Next, the reflective electrode 190 is formed to have a uniform thickness on the organic insulating layer 180. In this case, the reflective electrode 190 is electrically connected to the transparent electrode 170 through the opening window 181. Accordingly, the reflective electrode 190 receives a signal applied to the drain electrode 113 of the TFT 110 through the transparent electrode 170.

Referring to FIG. 7 again, the gate driving circuit 160 is provided in the array substrate 100 corresponding to the peripheral area PA. The gate driving circuit 160 is connected to one end of the gate line GL to provide a gate driving signal to the gate line GL. The gate driving circuit 160 is formed through the same process as the TFT 110 provided in the display area DA.

The color filter substrate 200 may include a light blocking film 210, a color filter 220 formed of RGB color pixels, a planarization film 230, a common electrode 240 made of a transparent conductive material, a protective film 252, and a cell gap maintaining member ( 251).

Specifically, a passivation layer 252 and a cell gap holding member 251 are provided on the color filter substrate 200 formed up to the common electrode 240, respectively. The passivation layer 252 is disposed on the common electrode 240 facing the gate driving circuit 160, and the cell gap holding member 251 is disposed on the common electrode 240 in the display area PA. It is provided.

The passivation layer 252 entirely covers the common electrode 240 facing the gate driving circuit 160, thereby protecting the gate driving circuit 160. That is, the passivation layer 252 is formed of a photosensitive organic insulating layer having a dielectric constant smaller than that of the liquid crystal layer 300, thereby reducing parasitic capacitance generated between the gate driving circuit 160 and the common electrode 240. You can. On the other hand, the cell gap holding member 251 is interposed between the array substrate 100 and the color filter substrate 200 to maintain the cell gap of the transmissive liquid crystal display device 400 to a predetermined size. The cell gap holding member 251 may be formed of the photosensitive organic insulating layer in the same manner as the passivation layer 252.

That is, since the parasitic capacitance is proportional to the dielectric constant, the passivation layer 252 having a lower dielectric constant than the liquid crystal layer 300 is interposed between the gate driving circuit 160 and the common electrode 240. Accordingly, the parasitic capacitance may be prevented from being generated between the gate driving circuit 160 and the common electrode 240.

According to the color filter substrate and the liquid crystal display device having the same, the protective film provided on the color filter substrate is provided on the common electrode so as to generally correspond to the driving part while having a lower dielectric constant than the liquid crystal layer to protect the driving part.

Accordingly, by reducing parasitic capacitance generated between the gate driving circuit and the common electrode of the color filter substrate, malfunction of the gate driving circuit can be prevented, thereby displaying the liquid crystal display device. Can improve the quality.

In addition, the short circuit of the gate driving circuit and the common electrode may be prevented by the passivation layer, thereby improving display quality of the liquid crystal display.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (12)

A color filter substrate coupled to an array substrate having a display unit for displaying an image and a drive unit provided around the display unit and providing a drive signal to the display unit, and displaying an image through a liquid crystal layer therebetween. Color filters; A transparent electrode formed on the color filter; And And a protective film provided on the transparent electrode so as to correspond to the driving part as a whole. The color filter substrate of claim 1, wherein the passivation layer is formed of a photosensitive organic insulating layer having a dielectric constant smaller than that of the liquid crystal layer. The color filter substrate of claim 1, further comprising a cell gap holding member spaced apart from the array substrate and the color filter substrate in the display unit. 4. The color filter substrate of claim 3, wherein the protective film and the cell gap holding member are made of a photosensitive organic insulating film having a dielectric constant smaller than that of the liquid crystal layer. An array substrate provided on a display unit for displaying an image and a driving unit provided around the display unit to provide a driving signal to the display unit; A color filter substrate comprising a color filter, a common electrode provided on the color filter, and a protective film provided on the common electrode generally corresponding to the driving part to protect the driving part; And a liquid crystal layer interposed between the array substrate and the color filter substrate. The liquid crystal of claim 5, further comprising a cell gap holding member interposed between the color filter substrate and the array substrate to separate the color filter substrate from the array substrate in correspondence to the display unit. Display. 7. The liquid crystal display device according to claim 6, wherein the cell gap holding member is provided on the color filter substrate. 7. The liquid crystal display device according to claim 6, wherein the protective film and the cell gap holding member are made of a photosensitive organic insulating film having a dielectric constant smaller than that of the liquid crystal layer. The method of claim 5, wherein the array substrate, Gate lines; A data line crossing the gate line; A switching element connected to the gate line and the data line; And And a pixel electrode coupled to the switching element. The liquid crystal display of claim 9, wherein the driving unit is connected to one end of the gate line to sequentially apply the driving signal to the gate line. The method of claim 5, wherein the array substrate, Gate lines; A data line crossing the gate line; A switching element connected to the gate line and the data line; A transparent electrode coupled to the switching element; A first insulating film having an opening window for exposing a portion of the transparent electrode and covering a portion where the switching element and the transparent electrode are connected on the switching element and the transparent electrode; And And a reflective electrode provided on the first insulating film and electrically connected to the transparent electrode through the opening window. The method of claim 11, wherein the array substrate is interposed between the switching element and the transparent electrode, and has a contact hole for exposing a portion of the switching element to electrically connect the switching element and the transparent electrode. And a second insulating film for the liquid crystal display device.