KR20040017505A - Color filter substrate, liquid crystal display having the same and method for manufacturing thereof - Google Patents

Abstract

Disclosed are a color filter substrate, a liquid crystal display having the same, and a manufacturing method thereof for minimizing driving failure. A color filter substrate coupled between a display unit and an array substrate having a drive unit for providing a drive signal to the display unit via a liquid crystal layer is provided between the display unit and the color filter formed on the substrate. And a transparent electrode formed on the color filter and corresponding to the remaining area except for the area corresponding to the driving unit. Therefore, the driving failure of the liquid crystal display device can be minimized.

Description

COLOR FILTER SUBSTRATE, LIQUID CRYSTAL DISPLAY HAVING THE SAME AND METHOD FOR MANUFACTURING THEREOF}

The present invention relates to an upper substrate, a liquid crystal display device having the same, and a manufacturing method thereof, and more particularly, to a color filter substrate for minimizing driving failure, a liquid crystal display device having the same, and a manufacturing method thereof.

Recently, information processing devices have been rapidly developed to have various forms, various functions, and faster information processing speed. Such an information processing apparatus requires a liquid crystal display, which is one of display apparatuses for displaying processed information so that a user can check it.

The liquid crystal display includes a liquid crystal display panel for displaying an image and a backlight assembly disposed under the liquid crystal display panel to provide light to the liquid crystal display panel.

The liquid crystal display panel is composed of a color filter substrate, an array substrate, and a liquid crystal layer formed between the color filter substrate and the array substrate. In this case, in order to control the liquid crystal layer to control light transmittance, a plurality of thin film transistors (hereinafter, referred to as TFTs) and first transparent electrodes connected to the TFTs are formed on the array substrate. In addition, the color filter substrate includes a color filter and a second transparent electrode formed on the color filter and facing the first transparent electrode.

Therefore, when a voltage is applied to each of the first and second transparent electrodes to form an electric field between the two electrodes, the arrangement angle of the liquid crystal layer is changed accordingly. In this way, the transmittance of light is adjusted, thereby realizing a screen.

Recently, by forming a gate driving circuit and a data driving circuit on the lower substrate of the liquid crystal display panel by the same thin film process as the switching element, a technique for reducing the number, volume, and size of the assembly process of the liquid crystal display has been developed. have.

In the case of such a liquid crystal display, the lower substrate is divided into a display area in which a TFT is formed and a drive area in which a gate for driving the TFT and a data driving circuit are formed.

In this case, since the second transparent electrode is formed over the entire area of the upper substrate, when the pressure is applied from the outside of the liquid crystal display panel to a predetermined pressure or more, the second transparent electrode and the gate and the data driving circuit formed on the lower substrate are in contact with each other.

As a result, the cap is increased between the inner terminal of the gate and the data driving circuit and the second transparent electrode of the color filter substrate, thereby slowing the switching of the inner terminal. Therefore, not only the TFT formed in the liquid crystal display panel is sufficiently driven, but also the output waveform is distorted, which causes a problem in that the liquid crystal display panel does not operate properly.

In order to solve this problem, the following method has been proposed.

The first method is to increase the W / L value of the TFTs used in the gate and data driving circuits and the display area. Although this method can solve the above-mentioned problem, there arises a problem that the area of the gate and data driving circuit is expanded in relation to the total area. This increase in area worsens the asymmetry of the liquid crystal display device in view of the fact that the gate and the data driving circuit are disposed only on one side of the liquid crystal display panel.

Secondly, the driving voltage for driving the TFT is increased. Such a method can solve the above-described problem, but causes a problem of increasing power consumption of the liquid crystal display.

A first object of the present invention for solving the above problems is to provide a color filter substrate for minimizing the driving failure of the liquid crystal display device.

In addition, a second object of the present invention is to provide a liquid crystal display device having a color filter substrate capable of minimizing driving failure.

Further, a third object of the present invention is to provide a method of manufacturing a liquid crystal display device for minimizing driving failure.

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

FIG. 2 is a plan view schematically illustrating an upper substrate and a lower substrate illustrated in FIG. 1.

3A to 3I are cross-sectional views illustrating a manufacturing process of the liquid crystal display shown in FIG. 2.

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

600: array substrate 620: TFT

640: pixel electrode 700: color filter substrate

720: color filter 740: common electrode

750: spacer 760: sealant

800: liquid crystal layer 900: liquid crystal display device

According to the present invention for achieving the first object of the present invention described above, coupled to the array substrate having a display portion and a driving portion for providing a drive signal to the display portion, and coupled to the array substrate, the liquid crystal layer between A color filter substrate for displaying an image therein, comprising: a substrate; A color filter formed on the substrate; And a transparent electrode formed on the color filter and corresponding to the remaining regions except for the region corresponding to the driving unit.

In addition, the liquid crystal display according to the present invention for achieving the second object of the present invention, an array substrate having a display unit formed with a first transparent electrode and a driving unit for providing a drive signal to the display unit formed around the display unit; ; A color filter substrate including a color filter and a second transparent electrode formed on the color filter so as to face the first transparent electrode and corresponding to a region other than a region corresponding to the driving unit; And a liquid crystal layer formed between the color filter substrate and the array substrate.

In addition, the manufacturing method of the liquid crystal display device according to the present invention for achieving the third object of the present invention, the display portion formed with a first transparent electrode, and formed around the display portion to provide a drive signal to the display portion and the driving unit Manufacturing an array substrate having; Manufacturing a color filter substrate having a color filter and a second transparent electrode formed on the color filter and corresponding to a second region which is a region other than a first region corresponding to the driving unit; Coupling the color filter substrate and the array substrate such that the first transparent electrode and the second transparent electrode face each other; And forming a liquid crystal layer between the color filter substrate and the array substrate.

According to such a color filter substrate, a liquid crystal display having the same, and a method of manufacturing the same, a color filter substrate that is coupled between a display unit and an array substrate having a driving unit with a liquid crystal layer interposed therebetween includes a substrate and a color formed on the substrate. And a transparent electrode formed on the color filter and corresponding to the remaining area except for the area corresponding to the driving unit. Therefore, the driving failure of the liquid crystal display device can be minimized.

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

1 is a cross-sectional view illustrating in detail a liquid crystal display according to another exemplary embodiment of the present invention, and FIG. 2 is a plan view schematically illustrating an upper substrate and a lower substrate illustrated in FIG. 1.

1 and 2, the liquid crystal display 900 according to another exemplary embodiment of the present invention may include an array substrate 600, a color filter substrate 700, an array substrate 600, and a color filter substrate 100. And a liquid crystal layer 800 formed therebetween to display an image.

In the array substrate 600, a thin film transistor (TFT) 620 is formed on the first substrate 610 in a matrix form by a thin film process, and the TFT 620 is processed in the same process as the TFT 620. The gate driving circuit 630 and the data driving circuit 650 are formed to drive. Here, the region in which the TFT 620 is formed is defined as the display region Ds, and the region in which the gate and data driving circuits 630 and 650 are formed is defined as the driving region Dr. In addition, an area in which the sealant 760 is to be formed is defined as a seal line area S1.

In the display area Ds, a plurality of gate lines 631 extending in the row direction and a plurality of data lines 651 extending in the column direction are formed. Here, the gate electrode 621 of the TFT 620 is connected to the gate line 631, the source electrode 622 is connected to the data line 651, and the drain electrode 623 is a pixel electrode made of ITO or IZO. 640 is connected.

The color filter substrate 700 is a substrate on which the color filter 720, the black matrix layer 730, and the common electrode 740 are formed on the second substrate 710. Specifically, on the second substrate 710, a color filter 720 consisting of R (Red), G (Green), and B (Blue) color pixels and expressed in a predetermined color by light is formed. In addition, a black matrix (BM) layer 730 is formed to block light leaked from the color pixels between the color pixels to improve a contrast rate (C / R). Subsequently, the second substrate 710 on which the color filter 720 and the black matrix layer 730 are formed is made of indium tin oxide (ITO) or indium zinc oxide (IZO). The common electrode 740 is stacked with a uniform thickness.

The color filter substrate 700 is divided into a first region corresponding to the display region Ds and the seal line region S1 of the array substrate 600, and a second region corresponding to the driving region Dr. In this case, the common electrode 740 is formed only in a region corresponding to the first region, and a portion corresponding to the second region is removed.

A cell gap holding member (hereinafter, referred to as a spacer) for maintaining the cell gap of the liquid crystal display device 900 by separating the two substrates 600 and 700 at predetermined intervals between the color filter substrate 700 and the array substrate 600. 750) is formed. Here, the spacer 750 may be formed on any one of the color filter substrate 700 and the array substrate 600, but the spacer 750 is illustrated in FIG. 1 and the color filter substrate 700. The structure formed on) is shown.

The spacer 750 is formed to correspond to the ineffective display area so as not to affect the aperture ratio (effective display area / total area) of the liquid crystal display device 900. That is, the spacer is formed in the region in which the TFT 620, the plurality of gate lines 631, and the data lines 651 are formed in the display region Ds.

Thereafter, the color filter substrate 700 and the array substrate 600 are coupled such that the common electrode 740 and the pixel electrode 640 face each other. At this time, a sealant 760 is formed in the seal line region S1 formed at the edges of the two substrates 600 and 700 to firmly couple the two substrates 600 and 700.

Next, the liquid crystal layer 800 is formed between the color filter substrate 700 and the array substrate 600. Thus, the liquid crystal display device 900 is completed.

In the liquid crystal display 900, the common electrode 740 is removed from the portion corresponding to the driving region Dr of the array substrate 600, thereby applying a predetermined force from the outside of the liquid crystal display 900. At this time, the common electrode 740 and the gate and the data driving circuits 630 and 650 may be prevented from contacting each other.

Hereinafter, the operation of the liquid crystal display 900 shown in FIG. 1 will be briefly described.

When electrical signals are applied from the outside of the liquid crystal display device 900 to the gate driving circuit 630 and the data driving circuit 650, respectively, the gate driving circuit 650 is connected to the TFTs of the gate lines 631 sequentially selected. An appropriate gate drive voltage is applied to drive 620. Subsequently, when the TFT 620 is sequentially driven for each line by the gate driving voltage, the image signal output from the data driving circuit 650 is provided to the data line 651 and then the TFT 620 driven by the gate driving voltage. Is applied to the pixel electrode 640 connected thereto. Thus, an electric field is formed between the common electrode 740 formed on the color filter substrate 700 and the pixel electrode 640 formed on the array substrate 600. The liquid crystal display 900 changes an array angle of the liquid crystal 800 by an electric field, thereby controlling the transmittance of light to display an image.

3A to 3F are cross-sectional views specifically illustrating a manufacturing process of the liquid crystal display shown in FIG. 1. 3G to 3I illustrate the structure in which the gate driving circuit 630 is formed for convenience of description, the same applies to the region in which the data driving circuit is provided.

Referring to FIG. 3A, a first photoresist (not shown) including a red pigment or dye is coated on the second substrate 710. Subsequently, a first mask (not shown) in which a pattern corresponding to the R color pixel is formed on the first photo register is disposed. Next, after exposing the first photoresist, the first photoresist reacts with the developer to remove the exposed portion of the first photoresist by the exposure process. Thus, the R color pixel shown in FIG. 3A is formed.

Thereafter, a second photoresist (not shown) including a green pigment or a dye is applied onto the second substrate 710 except for the region where the R pixel is formed, and then the same process as the R color pixel is repeated to repeat the G color pixel. To form. Thereafter, a third photoresist (not shown) including a blue pigment or dye is applied onto the second substrate 710 except for the region where the R and G color pixels are formed, and then the same process as the R and G color pixels is performed. Repeatedly form B pixel.

As a result, a color filter 720 formed of R.G.B color pixels is formed on the second substrate 710. Here, the color filter 720 is formed corresponding to the first region.

Referring to FIG. 3B, a black matrix layer 730 is formed on the second substrate 710 on which the color filter 720 is formed. Specifically, the black matrix layer 730 is formed between the RGB color pixels. Thus, blocking the light leaked from the color pixels between the RGB color pixels improves the contrast rate (C / R). The black matrix layer 730 is formed not only between the RGB color pixels in the first region but also in the second region so that the gate and data driving circuits 630 and 650 project on the screen of the liquid crystal display 900. Prevent it. In this case, chromium oxide (CrO ₂ ), organic BM, or the like is used for the black matrix layer 730.

As shown in FIG. 3C, a common electrode layer 745 made of ITO or IZO is stacked on the second substrate 710 on which the color filter 720 and the black matrix layer 730 are formed to have a uniform thickness over the entire area.

Subsequently, referring to FIG. 3D, a photosensitive film 746 is formed on the common electrode layer 745. Thereafter, a second mask 747 having an exposure area 747a formed on the photosensitive film 746 is formed. Therefore, after exposing the photosensitive film 746, the photosensitive film 746 reacts with the developer to remove the exposed photosensitive film.

Next, referring to FIG. 3E, the common electrode layer 745 exposed by the removed photoresist film is etched by reacting the etching solution. Next, when the photosensitive film 746 is removed, the common electrode 740 is formed only on the first region.

3F, a spacer 750 is formed on the common electrode 740 corresponding to the region where the black matrix layer 730 is formed. Here, the spacer 750 is formed to maintain the cell gap of the liquid crystal display device 900 and preferably has a stripe shape extending in one direction. Through this process, the color filter substrate 700 of the liquid crystal display device 900 is completed.

3G illustrates that a plurality of TFTs 620 are formed in a matrix in the display area Ds of the first substrate 610, and a plurality of gate lines (not shown) extending in a row direction in the same process as the TFT 620. And a plurality of data lines (not shown) extending in the column direction. Further, in the driving region Dr, a gate driving circuit 630 and a data driving circuit (not shown) for driving the TFT 620 are formed through the same process as the TFT 620.

Referring to FIG. 3H, a pixel electrode 640 made of ITO or IZO is electrically connected to a drain electrode (not shown) of the TFT 620 and formed on the first substrate 610. Thus, the array substrate 600 of the liquid crystal display device 900 is completed.

3I, the color filter substrate 700 and the array substrate 600 are coupled to face the common electrode 740 and the pixel electrode 640 to face each other. In this case, a sealant 760 is formed in the seal line region S1 of the color filter substrate 700 and the array substrate 600. Therefore, the color filter substrate 700 and the array substrate 600 are firmly coupled.

Referring to FIG. 1 again, the liquid crystal layer 800 is formed between the color filter substrate 700 and the array substrate 600 to complete the liquid crystal display device 900.

According to such a color filter substrate, a liquid crystal display device having the same, and a manufacturing method thereof, a state in which a liquid crystal layer is interposed between a display unit and an array substrate formed around the display unit and having a driving unit for providing a driving signal to the display unit. Transparent electrodes are formed on the color filter substrate to be bonded to each other, except for regions corresponding to the driving unit.

Therefore, when a predetermined force is applied from the outside of the liquid crystal display panel, the second spacer prevents contact between the common electrode formed on the upper substrate, the gate formed on the lower substrate, and the data driving circuit, thereby preventing driving failure of the liquid crystal display. do.

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 (6)

A color filter substrate formed around a display unit and a display unit, coupled to an array substrate having a drive unit for providing a drive signal to the display unit, and having a liquid crystal layer embedded therebetween to display an image. Board; A color filter formed on the substrate; And And a transparent electrode formed on the color filter and corresponding to the remaining area except for the area corresponding to the driving unit. The color filter substrate of claim 1, wherein the transparent electrode is formed of indium tin oxide. An array substrate having a display unit on which a first transparent electrode is formed and a driving unit formed around the display unit to provide a driving signal to the display unit; And A color filter substrate including a color filter and a second transparent electrode formed on the color filter so as to face the first transparent electrode and corresponding to a region other than a region corresponding to the driving unit; And And a liquid crystal layer formed between the color filter substrate and the array substrate. The liquid crystal display of claim 3, wherein the first and second transparent electrodes are formed of indium tin oxide. Manufacturing an array substrate having a first transparent electrode formed thereon, and providing a driving signal to the display unit, the array substrate having a driving unit; Manufacturing a color filter substrate having a color filter and a second transparent electrode formed on the color filter and corresponding to a second region which is a region other than a first region corresponding to the driving unit; Coupling the color filter substrate and the array substrate such that the first transparent electrode and the second transparent electrode face each other; And And forming a liquid crystal layer between the color filter substrate and the array substrate. The method of claim 4, wherein the manufacturing of the color filter substrate comprises: Forming a color filter on the substrate; Forming the second transparent electrode layer on the color filter; Forming a photoresist film on the second transparent electrode layer; Forming a mask on the photosensitive film, the mask having an exposure area for removing a portion of the second transparent electrode layer corresponding to the first area; And Exposing and developing the photosensitive film to partially expose the second transparent electrode; And etching the exposed second transparent electrode layer to form the second transparent electrode.