KR20050121882A - Color filter array panel, manufacturing method thereof, and liquid crystal display including the same - Google Patents

Abstract

The color filter display panel according to the present invention includes a black matrix formed on an insulating substrate, a color filter formed on an insulating substrate, an overcoat film formed on a color filter and a black matrix, a common electrode formed on an overcoat film, and a color. The main column spacer formed on the common electrode corresponding to the filter, and the sub column spacer on the common electrode corresponding to the black matrix, and the sub column spacer and the color filter do not overlap. Accordingly, the color filter display panel and the liquid crystal display including the same according to the present invention expose a chromium black matrix by etching a portion of the color filter overlapping the chromium black matrix when the chromium black matrix is used, and on the exposed chromium black matrix. By forming the sub-column spacer, a height difference is generated between the main column spacer and the sub-column spacer to distribute the external pressure to the sub-column spacer. Therefore, there is an advantage that the smear defect due to the external pressure can be prevented.

Description

COLOR FILTER ARRAY PANEL, MANUFACTURING METHOD THEREOF, AND LIQUID CRYSTAL DISPLAY INCLUDING THE SAME}

The present invention relates to a color filter display plate, a manufacturing method thereof, and a liquid crystal display device including the same.

The liquid crystal display is one of the most widely used flat panel display devices. The liquid crystal display includes two display panels on which a field generating electrode is formed and a liquid crystal layer interposed therebetween. It is a display device which controls the transmittance | permeability of the light which passes through a liquid crystal layer by rearranging.

The upper and lower substrates of the liquid crystal display are formed around the edges and are bonded by a sealing material confining the liquid crystal material, and are supported by spacers dispersed between the upper and lower substrates.

Spacers are classified into spherical and irregularly distributed beads spacers and column spacers or rigid spacers formed in a predetermined pattern.

The column spacer is formed by coating a photoresist film on a color filter display panel and exposing and developing the pattern to correspond to a portion of the pixel that does not transmit, for example, a channel portion, a gate line, a storage electrode line, and the like.

In this case, when the heights of the column spacers respectively formed inside the red, green, and blue filters corresponding to the storage electrode lines are constant, the column spacers of the predetermined portion may be broken when external pressure is applied to the upper and lower substrates of the liquid crystal display. It is easy to collapse, and the external membrane under the column spacer of a predetermined part is easily broken and collapsed by external pressure. As such, when the column spacer and the lower layer are broken and collapsed, smears, that is, black spots occur.

As such, when the heights of the column spacers are all the same, a design margin for preventing the occurrence of smear defects is small.

To prevent such smear defects, the main column spacer is formed on the color filter corresponding to the sustain electrode line, and the sub column spacer is formed on the color filter overlapping the organic black matrix, thereby generating a height difference between the main column spacer and the sub column spacer. The external pressure causes the sub column spacer to disperse.

However, when the chrome black matrix is applied, there is a problem in that the height difference between the sub column spacer and the main column spacer disappears. That is, the thickness of the chromium (Cr) black matrix is 0.2 µm, which is lower than that of the conventional organic black matrix, 1.5 µm. Therefore, the height difference between the height of the sub column spacer formed on the chrome black matrix and the main column spacer formed on the color filter is 0.1 μm or less, and thus does not satisfy the height difference required to prevent smear failure.

An object of the present invention is to provide a color filter display panel and a liquid crystal display device capable of preventing smear defects caused by external pressure by generating a height difference between a main column spacer and a sub column spacer when using a chrome black matrix.

The color filter display panel according to the present invention has a black matrix formed on an insulating substrate, a color filter formed on the insulating substrate, an overcoat film formed on the color filter and the black matrix, and a common formed on the overcoat film. An electrode, a main column spacer formed on the common electrode corresponding to the color filter, and a sub column spacer on the common electrode corresponding to the black matrix, wherein the sub column spacer and the color filter do not overlap.

In addition, it is preferable that an overcoat film, a common electrode, and a sub column spacer are sequentially formed on the black matrix.

In addition, the black matrix is preferably formed of chromium.

In addition, the color filter is preferably formed in a stripe form.

In addition, the color filter is preferably formed separately for each pixel.

In addition, the height difference between the main column spacer and the sub column spacer is preferably 0.3 to 0.5㎛.

A method of manufacturing a color filter display panel according to the present invention includes forming a black matrix on a substrate, forming a color filter on the substrate, forming an overcoat film on the color filter and the black matrix, and common on the overcoat film. Forming an electrode, forming a main column spacer on a common electrode corresponding to the color filter, and forming a sub column spacer on a common electrode corresponding to the black matrix, wherein the sub column spacer and the color filter It is preferable not to overlap.

In addition, it is preferable that an overcoat layer, a common electrode, and a sub column spacer are sequentially formed on the black matrix.

In addition, the liquid crystal display according to the present invention includes a first substrate, a pixel electrode formed on the first substrate, a second substrate positioned above the pixel electrode at a predetermined interval, and a black formed on the second substrate. A matrix, a color filter formed on the second substrate, an overcoat film formed on the color filter and the black matrix, a common electrode formed on the overcoat film, and a common electrode corresponding to the color filter. A main column spacer, a sub column spacer on the common electrode corresponding to the black matrix, and a liquid crystal layer formed between the pixel electrode and the common electrode, wherein the sub column spacer and the color filter do not overlap.

In addition, it is preferable that an overcoat film, a common electrode, and a sub column spacer are sequentially formed on the black matrix.

In addition, the black matrix is preferably formed of chromium.

The main column spacer may be formed at a position corresponding to the storage electrode line of the first substrate, or the main column spacer may be formed at a position corresponding to the gate line of the first substrate.

In addition, the height difference between the main column spacer and the sub column spacer is preferably 0.3 to 0.5㎛.

Then, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

Now, a color filter display panel according to an exemplary embodiment of the present invention, a manufacturing method thereof, and a liquid crystal display including the same will be described in detail with reference to the accompanying drawings.

1 is a layout view of a thin film transistor array panel for a liquid crystal display according to an exemplary embodiment of the present invention, and simultaneously shows a black matrix, a color filter, and a main and sub column spacer of a color filter panel for a liquid crystal display, and FIG. 2A 1 is a cross-sectional view of the thin film transistor array panel of FIG. 1 taken along the line IIa-IIa ', and FIG. 2B is a cross-sectional view of the thin film transistor array panel of FIG. 1 taken along the line IIb-IIb' of FIG. It is sectional drawing of the liquid crystal display device of a state.

First, a thin film transistor array panel for a liquid crystal display will be described in detail with reference to the drawings.

1 to 2B, a plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on the insulating substrate 110.

The gate line 121 and the storage electrode line 131 mainly extend in the horizontal direction and are separated from each other. The gate line 121 transmits a gate signal, and a portion of each gate line 121 protrudes up or down to form a plurality of gate electrodes 124. The storage electrode line 131 receives a predetermined voltage such as a common voltage, and includes the storage electrode 137 formed by an extension extending upward or downward.

The gate line 121 and the storage electrode line 131 include a conductive film formed of a silver-based metal such as silver (Ag) or a silver alloy having a low resistivity, or an aluminum-based metal such as aluminum (Al) or an aluminum alloy. In addition to conductive films, chromium (Cr), titanium (Ti), tantalum (Ta), molybdenum (Mo) and alloys thereof with good physical, chemical and electrical contact properties with other materials, in particular ITO or IZO [see: Molybdenum-Tungsten (MoW) alloy] may have a multilayer film structure including another conductive film. An example of the combination of the lower layer and the upper layer is chromium / aluminum-neodymium (Nd) alloy.

Sides of the gate line 121 and the storage electrode line 131 are inclined, and the inclination angle is in a range of about 30-80 ° with respect to the surface of the substrate 110.

A gate insulating layer 140 made of silicon nitride (SiNx) is formed on the gate line 121 and the storage electrode line 131.

A plurality of linear semiconductors 151 made of hydrogenated amorphous silicon (amorphous silicon is abbreviated a-Si) and the like are formed on the gate insulating layer 140. The linear semiconductor 151 extends mainly in the longitudinal direction, from which a plurality of extensions 154 extend toward the gate electrode 124.

A plurality of linear and island ohmic contacts 161 and 165 made of a material such as n + hydrogenated amorphous silicon doped with silicide or n-type impurities at a high concentration are formed on the semiconductor 151. have. The linear contact member 161 has a plurality of protrusions 163, and the protrusions 163 and the island contact members 165 are paired and positioned on the protrusions 154 of the semiconductor 151.

Side surfaces of the semiconductor 151 and the ohmic contacts 161 and 165 are also inclined, and the inclination angle is 30 to 80 degrees.

A plurality of data lines 171 and a plurality of drain electrodes 175 are formed on the ohmic contacts 161 and 165 and the gate insulating layer 140, respectively.

The data line 171 mainly extends in the vertical direction to cross the gate line 121 and transmit a data voltage. A plurality of branches extending from the data line 171 toward the drain electrode 175 forms a source electrode 173. The pair of source electrode 173 and the drain electrode 175 are separated from each other and positioned opposite to the gate electrode 123. The drain electrode 175 extends toward the extension portion 137 of the storage electrode line 131 and has an extension portion 177 overlapping the extension portion 137. The gate electrode 123, the source electrode 173, and the drain electrode 175 form a thin film transistor (TFT) together with the exposed portion 154 of the semiconductor 151, and a channel of the thin film transistor It is formed in the exposed portion 154 between the source electrode 173 and the drain electrode 175.

The data line 171 and the drain electrode 175 may also include a conductive film made of a silver metal or an aluminum metal. In addition to the conductive film, chromium (Cr), titanium (Ti), tantalum (Ta), and molybdenum (Mo) may be used. ) And other conductive films made of alloys thereof. Sides of the data line 171 and the drain electrode 175 are also inclined, and the inclination angle is in the range of about 30-80 ° with respect to the horizontal plane.

A passivation layer 180 made of an organic insulating material is formed on the data line 171, the drain electrode 175, and the exposed semiconductor portion 154. The passivation layer 180 has a contact hole 182 exposing a part 179 of the data line 171 and a contact hole 186 exposing a part of the drain electrode 175.

A plurality of pixel electrodes 190 and a plurality of contact assistants 82 made of ITO or IZO are formed on the passivation layer 180.

The pixel electrode 190 is physically and electrically connected to the drain electrode 175 through the contact hole 186 to receive a data voltage from the drain electrode 175.

The pixel electrode 190 to which the data voltage is applied rearranges the liquid crystal molecules of the liquid crystal layer between the two electrodes by generating an electric field together with a common electrode (not shown) of the upper panel.

In addition, the pixel electrode 190 and the common electrode form a capacitor (hereinafter referred to as a liquid crystal capacitor) to maintain an applied voltage even after the thin film transistor is turned off. There are other capacitors connected in parallel, called storage electrodes. The storage capacitor is made of the overlap of the pixel electrode 190 and the storage electrode line 131 and the overlap of the pixel electrode 190 and the neighboring gate line 121 (which is referred to as a prior gate line). In order to increase the capacitance of the capacitor, that is, the storage capacitor, an expansion unit 137 extending the storage electrode line 131 is provided to increase the overlap area, while drain connected to the pixel electrode 190 and overlapping the expansion unit 137. An extension 177 of the electrode 175 is placed under the passivation layer 180 to close the distance between the two.

The contact auxiliary member 82 is connected to the end portion 179 of the data line 171 through the contact hole 182. The contact assisting member 82 is not essential to serve to protect adhesiveness between the end portion 179 of the data line 171 and an external device and to protect them, and application thereof is optional.

One end portion 129 of the gate line 121 is used to receive a signal transmitted from a gate driving circuit (not shown) and may have a width wider than the width of the gate line 121.

The passivation layer 180 has a plurality of contact holes 181 exposing the end portion 129 of the gate line 121, and the contact hole 181 contacts the end portion 129 of the gate line 121. A plurality of contact auxiliary members 81 are formed. The contact auxiliary member 81 and the contact hole 181 may include a display panel 100 or a flexible circuit board (not shown) in the form of a chip in which a gate driving circuit (not shown) that supplies a signal to the gate line 121 is provided. Required if mounted on On the other hand, when the gate driving circuit is made of a thin film transistor or the like directly on the substrate 110, the contact hole 181 and the contact auxiliary member 81 are not required.

The lower alignment layer 11 that determines the alignment of the liquid crystal is formed on the pixel electrode 190.

Next, the color filter display panel for liquid crystal display devices is demonstrated in detail with reference to drawings.

3 is a plan view of a color filter display panel on which a black matrix, a color filter, a main column spacer, and a sub column spacer are formed, the color filter is formed in a stripe shape, and FIG. 5 is a black matrix, a color filter, a main The top view of the color filter display panel in which the column spacer and the sub column spacer are formed is shown, and the color filter is formed separately for each pixel.

As shown in FIGS. 1 and 2B, the upper substrate 210 is positioned above the lower alignment layer 11 at a predetermined interval. A black matrix 220 is formed on the upper substrate 210 to form a matrix to separate pixel regions. The black matrix is formed of chromium (Cr), and the thickness of the chromium (Cr) black matrix is about 0.2 μm.

A red filter 230R, a green filter 230G, and a blue filter 230B, which are required to display an image between the black matrix 220 and overlap with a portion of the black matrix 220, are formed.

As shown in FIG. 3, the red filter 230R, the green filter 230G, and the blue filter 230B may be formed in a stripe shape. As shown in FIG. 5, the red filter 230R and the green filter are illustrated. The 230G and the blue filters 230B may be formed separately for each pixel.

Black matrix 220, blue filter 230B, green filter 230G and red filter 230R to protect black matrix 220, blue filter 230B, green filter 230G and red filter 230R The overcoat film 250 is formed on it.

The common electrode 270 that forms an electric field together with the pixel electrode 190 is formed on the overcoat layer 250.

The main and sub column spacers 320a and 320b are formed on the common electrode 270. As shown in FIG. 2B, the main and sub column spacers 320a and 320b respectively have a common electrode 270 and a chrome black matrix 220 corresponding to the blue filter 230B of the upper substrate 210. It is formed on the electrode 270.

The main column spacer 320a serves to maintain the cell gap, and the sub column spacer 320b serves to disperse the external pressure.

1, the main and sub column spacers 320a and 320b are formed at positions corresponding to the sustain electrode 137 and the channel portion 154 of the lower substrate 110, respectively.

Accordingly, the columnar main and sub column spacers 320a and 320b support the two substrates 110 and 210 in parallel to maintain a constant gap (cell gap) of the liquid crystal layer 3. The upper alignment layer 21 is formed under the common electrode 270.

As shown in FIGS. 2B and 3, the sub column spacer 320b and the color filters 230B and 230G do not overlap. In other words, the overcoat layer 250, the common electrode 270, and the sub column spacer 320b are sequentially formed on the black matrix 220.

Conventionally, the height difference between the main column spacer 320a and the sub column spacer 320b is formed by forming the main column spacer 320a on the color filter and forming the sub column spacer 320b on the color filter partially overlapping the organic black matrix. Was generated to distribute the external pressure to the main column spacer 320a.

However, when the chrome black matrix 220 is applied, there is a problem in that the height difference between the sub column spacer 320b and the main column spacer 320a is lost.

In order to prevent this, in one embodiment of the present invention, a portion of the color filter overlapping the chrome black matrix 220 is etched to expose the chrome black matrix 220.

Unlike the conventional method of forming the sub-column spacer 320b on the color filter overlapping the chrome black matrix 220, a portion of the color filters 230B and 230G is etched to expose the sub-column on the exposed chrome black matrix 220. The spacer 320b is formed. Therefore, since the sub column spacer 320b and the color filters 230B and 230G do not overlap, the height of the sub column spacer 320b is lowered.

Therefore, a height difference d is generated between the main column spacer 320a formed on the blue filter 230B and the sub column spacer 320b formed on the chromium black matrix 220 to generate an external pressure. Let 320b disperse.

In this case, the height difference d between the main column spacer 320a and the sub column spacer 320b is preferably 0.3 to 0.5 μm.

As such, the height difference d between the main and sub-column spacers 320a and 320b is large, so that when an external pressure is applied to the upper and lower substrates 110 and 210 of the liquid crystal display device, the column spacer and the column spacer are likely to occur. Smear defects or black gaps due to breakage and collapse of the lower layer can be prevented. That is, by increasing the height difference d between the main and sub column spacers 320a and 320b, a design margin for preventing the occurrence of smear defects can be secured.

A liquid crystal display according to another exemplary embodiment of the present invention is illustrated in FIGS. 4A and 4B. FIG. 4A is a plan view of a color filter display panel in which a black matrix, a color filter, a main column spacer, and a sub column spacer are formed, and FIG. 4B is a layout view of a thin film transistor array panel for a liquid crystal display according to another exemplary embodiment. As a figure, there is shown a diagram showing a black matrix, a color filter, and a main and sub column spacer of a color filter display panel for a liquid crystal display at the same time.

Here, the same reference numerals as in the above-described drawings indicate the same members having the same function.

As shown in FIGS. 4A and 4B, the main and sub column spacers 320a and 320b are formed at positions corresponding to the gate line 121 and the channel portion 154 of the lower substrate 110, respectively. This is useful when the storage electrode line 131 is not formed corresponding to the color filter formation region or when the storage electrode line 131 is not formed differently from the exemplary embodiment of the present invention.

The columnar main column spacer 320a supports the two substrates 110 and 210 in parallel to maintain the gap (cell gap) of the liquid crystal layer 3, and the sub column spacer 320b distributes the external pressure. It plays a role.

The sub column spacer 320b and the color filters 230B and 230G do not overlap. That is, an overcoat film, a common electrode, and a sub column spacer are sequentially formed on the black matrix 220.

In one embodiment of the present invention, a portion of the color filter overlapping the chrome black matrix 220 is etched to expose the chrome black matrix 220.

Unlike the conventional method of forming the sub column spacer 320b on the color filter overlapping the chrome black matrix, a portion of the color filter is etched to form the sub column spacer 320b on the exposed chrome black matrix 220. Therefore, since the sub column spacer 320b and the color filters 230B and 230G do not overlap, the height of the sub column spacer 320b is lowered.

Therefore, a height difference d is generated between the main column spacer 230a formed on the blue filter 230B and the sub column spacer 320b formed on the chromium black matrix 220 to thereby generate an external pressure to supply the external pressure. Let 320b disperse.

In this case, the height difference d between the main column spacer 320a and the sub column spacer 320b is preferably 0.3 to 0.5 μm.

As such, the height difference d between the main and sub-column spacers 320a and 320b is large, so that when an external pressure is applied to the upper and lower substrates 110 and 210 of the liquid crystal display device, the column spacer and the column spacer are likely to occur. Smear defects or black gaps due to breakage and collapse of the lower layer can be prevented. That is, by increasing the height difference d between the main and sub column spacers 320a and 320b, a design margin for preventing the occurrence of smear defects can be secured.

Although the preferred embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

The color filter display panel and the liquid crystal display including the same according to the present invention expose a chromium black matrix by etching a portion of the color filter overlapping the chromium black matrix when the chromium black matrix is used, and a sub-column on the exposed chromium black matrix. By forming the spacer, a height difference is generated between the main column spacer and the sub column spacer so that the external pressure is dispersed by the sub column spacer. Therefore, there is an advantage that the smear defect due to the external pressure can be prevented.

1 is a layout view of a thin film transistor array panel for a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2A is a cross-sectional view of the thin film transistor array panel of FIG. 1 taken along a line IIa-IIa ',

FIG. 2B is a cross-sectional view of the thin film transistor array panel of FIG. 1 taken along the line IIb-IIb ′, and is a cross-sectional view of the liquid crystal display with the color filter panel coupled thereto;

3 is a plan view of a color filter display panel in which a black matrix, a color filter, a main column spacer, and a sub column spacer are formed, and the color filters are formed in a stripe shape.

4A is a plan view of a color filter display panel on which a black matrix, a color filter, a main column spacer, and a sub column spacer are formed;

FIG. 4B is a layout view of a thin film transistor array panel for a liquid crystal display according to another exemplary embodiment, and simultaneously shows a black matrix, a color filter, and a main and sub column spacer of a color filter panel for a liquid crystal display;

5 is a plan view of a color filter display panel in which a black matrix, a color filter, a main column spacer, and a sub column spacer are formed, and the color filters are formed separately for each pixel.

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

110: substrate 121, 129: gate line

124: gate electrode 140: gate insulating film

151 and 154 semiconductor 161 and 165 resistive contact members

171, 179: data line 173: source electrode

175: drain electrode 180: protective film

181, 182, 185: contact hole 190: pixel electrode

81, 82: contact auxiliary member

Claims (14)

A black matrix formed on an insulating substrate, A color filter formed on the insulating substrate, An overcoat film formed on the color filter and the black matrix, A common electrode formed on the overcoat film, A main column spacer formed on the common electrode corresponding to the color filter, A sub-column spacer on the common electrode corresponding to the black matrix Including, And a color filter display panel in which the sub column spacer and the color filter do not overlap. In claim 1, An overcoat film, a common electrode, and a sub column spacer are sequentially formed on the black matrix. In claim 1, And the black matrix is formed of chromium. In claim 1, The color filter display panel is formed in a stripe shape. In claim 1, And the color filter is formed separately for each pixel. In claim 1, And a height difference between the main column spacer and the sub column spacer is 0.3 to 0.5 μm. Forming a black matrix on the substrate, Forming a color filter on the substrate, Forming an overcoat layer on the color filter and the black matrix, Forming a common electrode on the overcoat layer, Forming a main column spacer on the common electrode corresponding to the color filter, and forming a sub column spacer on the common electrode corresponding to the black matrix Including, The sub-column spacer and the color filter do not overlap the manufacturing method of the color filter display panel. In claim 7, An overcoat film, a common electrode, and a sub column spacer are sequentially formed on the black matrix. First substrate, A pixel electrode formed on the first substrate, A second substrate spaced apart from the pixel electrode at a predetermined interval; A black matrix formed on the second substrate, A color filter formed on the second substrate, An overcoat film formed on the color filter and the black matrix, A common electrode formed on the overcoat film, A main column spacer formed on the common electrode corresponding to the color filter, A sub-column spacer on the common electrode corresponding to the black matrix, Liquid crystal layer formed between the pixel electrode and the common electrode Including, The sub column spacer and the color filter do not overlap. In claim 9, An overcoat layer, a common electrode, and a sub column spacer are sequentially formed on the black matrix. In claim 9, The black matrix is formed of chromium. In claim 9, And the main column spacer is formed at a position corresponding to the storage electrode line of the first substrate. In claim 9, The main column spacer is formed at a position corresponding to the gate line of the first substrate. In claim 9, And a height difference between the main column spacer and the sub column spacer is 0.3 to 0.5 μm.