KR20060135098A - Color filter substrate and liquid crystal display panel comprising the same - Google Patents

Abstract

The present invention relates to a color filter substrate and a liquid crystal display panel including the same. The color filter substrate according to the present invention includes a substrate; A black matrix formed on the substrate; A color filter partially overlapping the black matrix and formed on the substrate and having a depression; It includes a common electrode formed on the color filter. As a result, a color filter substrate capable of improving side visibility and improving luminance characteristics is provided.

Description

Color filter substrate and liquid crystal display panel including the same {COLOR FILTER SUBSTRATE AND LIQUID CRYSTAL DISPLAY PANEL HAVING THE SAME}

1 is a layout view of a thin film transistor substrate of a liquid crystal display panel according to a first embodiment of the present invention;

2 is a layout view of a color filter substrate according to a first embodiment of the present invention;

3 is a cross-sectional view of the liquid crystal display panel taken along line III-III of FIGS. 1 and 2; and

4 is a layout view of a color filter substrate according to a second exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: thin film transistor substrate 110: second substrate

121, 122, 123: gate wiring 131, 132, 133, 134: data wiring

141: gate insulating film 142: semiconductor layer

143: ohmic contact layer 151: protective film

161: organic film 171: pixel electrode

173: Pixel electrode incision pattern 181, 182, 183: Contact hole

200, 201: color filter substrate 210: first substrate

221 black matrix 222 color filter

 223, 224: depression 230: overcoat layer

231: common electrode 232: common electrode incision pattern

300: liquid crystal layer

The present invention relates to a color filter substrate and a liquid crystal display panel including the same, and more particularly, to a color filter substrate for differentially transmitting light to improve side visibility and brightness characteristics, and a liquid crystal display panel including the same. It is about.

The liquid crystal display device includes a thin film transistor substrate on which a thin film transistor is formed, a color filter substrate on which a color filter layer is formed, and a liquid crystal display panel on which a liquid crystal layer is positioned. Since the liquid crystal display panel is a non-light emitting device, a backlight unit for irradiating light may be disposed on the rear surface of the thin film transistor substrate. Light transmitted from the backlight unit is controlled according to the arrangement of the liquid crystal layer.

In addition, in order to drive each pixel of the liquid crystal display panel, a driving circuit and a data driver and a gate driver for receiving a driving signal from the driving circuit and applying a voltage to the data line and the gate line in the display area are provided.

Such a liquid crystal display device is advantageous for thin, small size, and low power consumption, but has disadvantages in size, realization of full color, improvement of contrast, and wide viewing angle.

In order to compensate for the wide viewing angle, which is a disadvantage of the liquid crystal display, many researches such as multi-domain technology, phase compensation technology, IPS mode, VA mode, and optical path control technology have been applied. Further, PVA and SE (surrounding) combining partial etching slits of pixel electrodes and other techniques (e.g., cholesteric dopants, alignment control electrodes, orientation methods such as protrusions and rubbing) in VA mode, respectively. electrodes, ridge fringe field multidomain homeotropic (REFMH), and lateral field induced VA (LFIVA).

In the patterned vertically aligned (PVA) mode, incision patterns are formed on the pixel electrode and the common electrode, respectively. It is a method of widening the viewing angle by controlling the direction in which the liquid crystal molecules lie down using a fringe field formed by these incision patterns. However, even in such a PVA mode, there is a disadvantage that the side visibility is inferior.

In order to improve this side visibility, it has two sub-pixel structures in which the sub-pixels are combined with the PVA's main cell, and the same signal voltage is applied to the main and sub-pixels to increase the wide viewing angle and reduce the distortion of the screen. Although a patterned vertically aligned mode has been developed, there is a problem that the structure is complicated, the yield is low, and the luminance property is deteriorated by reducing the aperture ratio.

Accordingly, an object of the present invention is to provide a color filter substrate that can improve side visibility and improve luminance characteristics.

Another object of the present invention is to provide a liquid crystal display panel including a color filter substrate capable of improving side visibility and improving luminance characteristics.

The object is, according to the present invention, a substrate; A black matrix formed on the substrate; A color filter partially overlapping the black matrix and formed on the substrate and having a depression; It is achieved by a color filter substrate including a common electrode formed on the color filter.

Preferably, the depression is formed at the center of the color filter.

It is preferable that the said recessed part is provided in multiple numbers.

The color filter substrate may further include an overcoat layer formed between the color filter and the common electrode.

It is preferable that the cutout pattern is formed in the common electrode.

On the other hand, another object of the present invention and the color filter substrate; A thin film transistor substrate disposed opposite the color filter substrate and having a thin film transistor and a pixel electrode electrically connected to the thin film transistor; It is achieved by a liquid crystal display panel comprising a liquid crystal layer positioned between the color filter substrate and the thin film transistor substrate.

The liquid crystal layer is preferably in a vertically aligned (VA) mode.

Preferably, the pixel electrode is formed with a cutout pattern.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail.

In various embodiments, like reference numerals refer to like elements, and like reference numerals refer to like elements in the first embodiment and may be omitted in other embodiments.

A color filter substrate and a liquid crystal display panel including the same according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a layout view of a thin film transistor substrate of a liquid crystal display panel according to a first embodiment of the present invention, FIG. 2 is a layout view of a color filter substrate according to a first embodiment of the present invention, and FIG. A cross-sectional view of the liquid crystal display panel along the III-III line of FIG.

The liquid crystal display panel according to the first exemplary embodiment of the present invention includes a thin film transistor substrate 100, a color filter substrate 200 facing the thin film transistor substrate, and a liquid crystal layer 300 positioned therebetween.

First, the thin film transistor substrate 100 will be described.

Gate wirings 121, 122, and 123 are formed on the second substrate 110. The gate wirings 121, 122, and 123 may be a metal single layer or multiple layers. The gate lines 121, 122, and 123 include a gate line 121 extending in a horizontal direction and a gate electrode 122 of a thin film transistor connected to the gate line 121. Here, the gate pad 123 positioned outside the display area is one end of the gate line 122, and the width of the gate pad 123 is extended for connection with an external circuit.

On the second substrate 110, a gate insulating layer 141 made of silicon nitride (SiNx) or the like covers the gate lines 121, 122, and 123.

A semiconductor layer 142 made of a semiconductor such as amorphous silicon is formed on the gate insulating layer 141 of the gate electrode 122, and n + having a high concentration of silicide or n-type impurities is formed on the semiconductor layer 142. An ohmic contact layer 143 made of a material such as hydrogenated amorphous silicon is formed. The ohmic contact layer 143 is divided into two parts around the gate electrode 122.

Data lines 131, 132, 133, and 134 are formed on the ohmic contact layer 143 and the gate insulating layer 141. The data lines 131, 132, 133, and 134 may also be single layers or multiple layers of metal layers. The data wires 131, 132, 133, and 134 are formed in a vertical direction and intersect the gate line 121 to define a pixel to define a pixel and a branch of the data line 131 and the data line 131. The drain electrode 133 which is separated from the source electrode 132 and the source electrode 132 extending to the upper side and formed on the ohmic contact layer 143 opposite to the source electrode 132 with respect to the gate electrode 122. ). The data pad 134 positioned outside the display area is one end of the data line 131, and the width of the data pad 134 is extended for connection with an external circuit.

A passivation film 151 made of silicon nitride, such as the gate insulating film 141, is formed on the data wires 131, 132, 133, and 134 and the semiconductor layer 142 which is not covered. The passivation layer 151 is provided with contact holes 181 and 183 exposing the drain electrode 133 and the data pad 134, respectively, and the contact hole 182 exposing the gate pad 123 together with the gate insulating layer 141. Also formed.

The organic layer 161 and the pixel electrode 171 are formed on the passivation layer 151. The pixel electrode 171 is usually made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The pixel electrode 171 penetrates through the organic layer 16 and the passivation layer 151 and contacts the drain electrode 133 through the drain contact hole 181.

The pixel electrode cut pattern 173 is formed on the pixel electrode 171. This is formed to divide the liquid crystal layer 300 into a plurality of domains together with the common electrode cutout pattern 232 described later. The pixel electrode cut pattern 173 is formed in a 'V' shape in the pixel area.

Next, the color filter substrate 200 will be described.

The black matrix 221 is formed on the first substrate 210. The black matrix 221 generally distinguishes between red, green, and blue filters, and serves to block direct light irradiation to the thin film transistor positioned on the thin film transistor substrate 100. The black matrix 221 is usually made of a photosensitive organic material to which black pigment is added. As the black pigment, carbon black or titanium oxide is used.

The color filter 222 partially overlaps the black matrix 221 and is formed on the first substrate 210. The red, green, and blue filters are repeatedly formed around the black matrix 221. The color filter 222 serves to impart color to light emitted from the backlight unit (not shown) and passed through the liquid crystal layer 300. The color filter layer 222 is usually made of a photosensitive organic material.

2 to 3, the color filter 222 has a recessed portion 223 formed in the center thereof. The thickness d ₁ of the color filter 222 of the depression 223 is thinner than the thickness d ₂ of the color filter 222 of the portion where the depression is not formed. Therefore, the light passing through the liquid crystal layer 330 differentially passes through the color filter 222 due to the thickness difference of the color filter 222. In particular, the path of light passing obliquely through the color filter 222 of the portion where the depression 223 is not formed among the light passing through the color filter 222 is perpendicular to the culper filter 222 of the depression 223. It becomes longer than the path of incident light.

In the case of light having a long propagation path passing through the color filter 222, the luminance is lowered, but in terms of color reproducibility, the propagation path is higher than the short light. When the LCD is not viewed from the front but viewed from the side or the vertical direction, most of the light entering the user's eyes obliquely passes through the color filter 222 of the portion where the depression 223 is not formed. To occupy.

When the liquid crystal display panel is viewed from the side or the up and down direction instead of the front side, the screen is bright and whitish, resulting in poor side visibility. Accordingly, according to the color filter substrate 200 having the color filter 222 and the liquid crystal display panel including the same, the depression 223 is formed in the color filter 222 to form the color filter ( By making the thickness of the center portion 223 thin, it is possible to solve the problem of side visibility by giving a difference in color reproducibility according to the up, down, left, right and front directions. In addition, unlike the SPVA introduced to solve the side visibility problem, it is not necessary to have a separate additional thin film transistor and a black matrix 221 to cover it. Accordingly, the color filter substrate 200 and the liquid crystal display panel including the same may be provided to increase the aperture ratio to improve luminance.

An overcoat layer 223 is formed on the black matrix 221 not covered by the color filter 222 and the color filter 222. The overcoat layer 223 serves to protect the color filter layer 222 while planarizing the color filter layer 222, and an acrylic epoxy material is generally used.

The common electrode 231 is formed on the overcoat layer 223. The common electrode 231 is made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The common electrode 231 directly applies a voltage to the liquid crystal layer 300 together with the pixel electrode 171 of the thin film transistor substrate. The common electrode cutting pattern 232 is formed on the common electrode 231. The common electrode cutout pattern 232 divides the liquid crystal layer 300 into a plurality of domains together with the pixel electrode cutout pattern 173 of the pixel electrode 171.

The pixel electrode cut pattern 173 and the common electrode cut pattern 232 may be formed in various shapes. For example, both the pixel electrode cutting pattern 173 and the common electrode cutting pattern 232 may be formed diagonally and orthogonally to each other. In this case, the direction of the fringe field is evenly distributed in four directions.

Hereinafter, a manufacturing process of the color filter substrate 200 according to the first embodiment of the present invention will be described.

First, a black matrix 221 is formed on the first substrate material 210. The black matrix 221 may be made of a photosensitive material to which black pigment is added, and is completed by applying, developing, and baking. Thereafter, a red photosensitive organic material is coated on a portion of the black matrix 221 and the first substrate 210 on which the black matrix 221 is not formed, and then exposed to one subpixel (not shown) through exposure and development. The red color filter 222 is formed. After the green photosensitive organic material is coated again, the green color filter 222 is formed in another subpixel through exposure and development. The blue color filter 222 is formed through the same process. Thereafter, only the central portion of each color filter is exposed and developed using a mask to complete the color filter 222 having the depression 223 formed therein.

When the color filter 222 is completed, the overcoat layer 230 is formed to planarize the color filter 222 and protect the color filter 222. Thereafter, the common electrode 231 is deposited on the overcoat layer 230 through a sputtering method. Thereafter, when the common electrode incision pattern 232 is formed through development and etching, the color filter substrate 200 is completed.

The liquid crystal layer 300 is positioned between the thin film transistor substrate 100 and the color filter substrate 200. The liquid crystal layer 300 is a VA (vertically aligned) mode, and the liquid crystal molecules are vertical in the length direction when no voltage is applied. When voltage is applied, the liquid crystal molecules lie perpendicular to the electric field because the dielectric anisotropy is negative. However, when the pixel electrode incision pattern 173 and the common electrode incision pattern 232 are not formed, the liquid crystal molecules are randomly arranged in various directions because the azimuth of the lying down is not determined, and the foreground lines at the boundary planes having different orientations are different. ) The pixel electrode cut pattern 173 and the common electrode cut pattern 232 form a fringe field when a voltage is applied to the liquid crystal layer 300 to determine an azimuth angle of the liquid crystal alignment. In addition, the liquid crystal layer 300 is divided into multiple regions according to the arrangement of the pixel electrode incision pattern 173 and the common electrode incision pattern 232.

Hereinafter, a color filter substrate according to a second embodiment of the present invention will be described with reference to FIG. 4. 4 is a layout view of a color filter substrate according to a second exemplary embodiment of the present invention.

As shown in FIG. 4, the color filter substrate 201 according to the second embodiment of the present invention includes a plurality of color filters 222 in which a recess 224 is formed at a predetermined interval from the first embodiment of the present invention. Have Therefore, the color filter substrate 201 according to the second embodiment of the present invention also solves the problem of side visibility that occurs when the LCD panel is viewed from the side or in the vertical direction rather than viewed from the front. A culper filter substrate 201 is provided which can be improved by making the progress path long and also improve the aperture ratio.

The above embodiments can be variously modified. In the first and second embodiments of the present invention, the mode of the liquid crystal display panel has been described based on the PVA mode, but the present invention is not limited thereto, and it is also possible to use the VA mode or the SPVA mode.

Thus, although some embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that modifications may be made to the embodiment without departing from the spirit or spirit of the invention. will be. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

As described above, according to the present invention, a color filter substrate capable of improving side visibility and improving luminance characteristics and a liquid crystal display panel including the same are provided.

Claims (8)

A substrate; A black matrix formed on the substrate; A color filter partially overlapping the black matrix and formed on the substrate and having a depression; A color filter substrate comprising a common electrode formed on the color filter. The method of claim 1, The depression portion is a color filter substrate, characterized in that formed in the central portion of the color filter.  The method of claim 1, The depression portion is provided with a plurality of color filter substrate, characterized in that. The method of claim 1, The color filter substrate further comprises an overcoat layer formed between the color filter and the common electrode. The method of claim 1, The common electrode is a color filter substrate, characterized in that the incision pattern is formed. A color filter substrate according to any one of claims 1 to 5; A thin film transistor substrate disposed opposite the color filter substrate and having a thin film transistor and a pixel electrode electrically connected to the thin film transistor; And a liquid crystal layer disposed between the color filter substrate and the thin film transistor substrate. The method of claim 6, And the liquid crystal layer is in a vertically aligned (VA) mode. The method of claim 6, The pixel electrode is a liquid crystal display panel, characterized in that the incision pattern is formed.

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