KR20070081522A - Liquid crystal display, panel therefor, and manufacturing method thereof - Google Patents

Abstract

An LCD(Liquid Crystal Display), a display panel for the same, and a manufacturing method thereof are provided to prevent a color filter ink from being mixed with a color filter ink of the next pixel by confining the color filter ink flowing over a light blocking member in a recess portion. A plurality of partition walls are formed on a substrate(210) and define a plurality of apertures(225). A plurality of color filters(230) are formed at the plurality of apertures. The partition wall includes a recess portion(226) at a central portion, and the recess portion is lower than a peripheral portion. The partition wall is a light blocking member(220). An electric field generating electrode is formed on the substrate.

Description

Liquid crystal display device, display panel for this and manufacturing method therefor {LIQUID CRYSTAL DISPLAY, PANEL THEREFOR, AND MANUFACTURING METHOD THEREOF}

1 is a layout view of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a layout view of a color filter panel of a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a cross-sectional view of the liquid crystal display of FIG. 1 taken along line III-III.

4 is a cross-sectional view of the liquid crystal display of FIG. 1 taken along line IV-IV.

5A through 5D are cross-sectional views illustrating a manufacturing process of a color filter display panel for a liquid crystal display according to an exemplary embodiment of the present invention.

<Description of Drawing>

3.Liquid crystal layer 81, 82 ... contact auxiliary member

83 Connection bridge 100 Thin film transistor display panel

110 ... substrate 121, 129 ... gate line

124 gate electrode 131 holding electrode wire

133a, 133b ... hold electrode 140 ... gate insulating film

151, 154 ... semiconductor 161, 163, 165 ... resistive contact layer

171, 179 Data line 173 Source electrode

175 Drain electrode 180 Shield

181, 182, 183a, 183b, 185 ... contact hole 191 ... pixel electrode

200 ... color filter panel 210 ... substrate

220 ... light-shielding member 230 ... color filter

250 ... overcoat 270 ... common electrode

The present invention relates to a display panel for a liquid crystal display device, a liquid crystal display device and a manufacturing method thereof.

In general, a liquid crystal display device includes a liquid crystal layer positioned between a field generating electrode and a pair of display panels provided with a polarizing plate. The field generating electrode generates an electric field in the liquid crystal layer and the arrangement of liquid crystal molecules changes as the intensity of the electric field changes. For example, the liquid crystal molecules of the liquid crystal layer in the state in which the electric field is applied to change the polarization of the light passing through the liquid crystal layer. The polarizer displays a desired image by appropriately blocking or transmitting polarized light to create bright and dark areas.

One display panel of the liquid crystal display is formed with three primary color filters such as red, green, and blue. One of the methods for forming such a color filter is to use an inkjet printing system.

Forming a color filter using an inkjet printing system sprays a desired amount of three primary colors such as red, green, and blue through a plurality of nozzles of an inkjet head, thereby injecting the ink sprayed into the area surrounded by the light blocking member on the substrate. It is a way of filling and forming.

At this time, when the color filter ink is sprayed on the area surrounded by the light blocking member to cross the light blocking member, the color filter ink is mixed, and when the color filter ink is sprayed less, the color filter is formed lower than the light blocking member and is high. The presence of a difference can change the arrangement of liquid crystals.

Accordingly, a technical problem to be achieved by the present invention is to produce a color filter using an inkjet printing system, while preventing the color filter from being formed in the region defined by the light blocking member to be low, and a color filter capable of preventing the mixing of ink. A display panel, a method of manufacturing the same, and a liquid crystal display including the same are provided.

The color filter display panel for a liquid crystal display according to the present invention is formed on a substrate, and includes a plurality of partitions defining a plurality of openings, and a plurality of color filters formed in the plurality of openings, the partition having a central portion. It may have a recess lower than the height.

The partition wall may be a light blocking member.

The color filter display panel may further include an electric field generating electrode formed on the substrate.

A liquid crystal display according to an exemplary embodiment of the present invention includes a first substrate, a gate line and a data line formed on the first substrate, a thin film transistor connected to the gate line and the data line, and a pixel connected to the thin film transistor. An electrode, a second substrate facing the first substrate, a light blocking member formed on the second substrate, a color filter formed on the second substrate and the light blocking member, and a common electrode formed on the color filter; It includes, the light blocking member may have a concave portion having a height lower than the periphery in the central portion.

The color filter may be formed in the recess.

A method of manufacturing a color filter display panel for a liquid crystal display according to an exemplary embodiment of the present invention includes preparing a substrate, forming a light blocking member having a recess having a low height of a central portion on the substrate, and using an inkjet printing system. And dripping the color filter ink in a region defined by the light blocking member, and drying the solvent of the ink by curing the dropped ink.

The forming of the light blocking member includes stacking a light blocking member layer on the substrate, and exposing and developing the light blocking member layer, wherein the exposure includes a light mask having a light transmitting region, a light blocking region, and a semi-transmissive region. Can be used.

The forming of the light blocking member may include stacking the light blocking member layer on the substrate, and imprinting the light blocking member layer by using a mold such as a shape of the light blocking member having a low height at the center portion.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may 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.

A color filter display panel for a liquid crystal display according to an exemplary embodiment of the present invention and a liquid crystal display including the same will be described in detail with reference to FIGS. 1 to 4.

1 is a layout view of a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 2 is a layout view of a display panel for a color filter according to an exemplary embodiment of the present invention, and FIGS. 3 and 4 are respectively a liquid crystal display of FIG. 1. Is a cross-sectional view taken along lines III-III and IV-IV.

The liquid crystal display according to the present exemplary embodiment includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other, and a liquid crystal layer 3 interposed between the two display panels 100 and 200.

Next, a thin film transistor array panel for a liquid crystal display will be described in detail with reference to FIGS. 1, 3, and 4.

A plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on an insulating substrate 110 made of transparent glass or plastic.

The gate line 121 transmits a gate signal and mainly extends in a horizontal direction. Each gate line 121 includes a plurality of gate electrodes 124 protruding downward and an end portion 129 having a large area for connection with another layer or an external driving circuit. A gate driving circuit (not shown) for generating a gate signal may be mounted on a flexible printed circuit film (not shown) attached to the substrate 110 or directly mounted on the substrate 110, It may be integrated into the substrate 110. When the gate driving circuit is integrated on the substrate 110, the gate line 121 may extend to be directly connected to the gate driving circuit.

The storage electrode line 131 receives a predetermined voltage, and includes a stem line extending substantially in parallel with the gate line 121 and a plurality of pairs of first and second storage electrodes 133a and 133b separated therefrom. Each of the storage electrode lines 131 is positioned between two adjacent gate lines 121, and the stem line is closer to the lower side of the two gate lines 121. Each of the sustain electrodes 133a and 133b has a fixed end connected to the stem line and a free end opposite thereto. The fixed end of the first sustain electrode 133a has a large area, and its free end is divided into two parts, a straight portion and a bent portion. However, the shape and arrangement of the storage electrode line 131 may be modified in various ways.

The gate line 121 and the storage electrode line 131 may be formed of aluminum-based metal such as aluminum (Al) or aluminum alloy, silver-based metal such as silver (Ag) or silver alloy, copper-based metal such as copper (Cu) or copper alloy, or molybdenum ( It may be made of molybdenum-based metal such as Mo) or molybdenum alloy, chromium (Cr), tantalum (Ta) and titanium (Ti). However, they may have a multilayer structure including two conductive films (not shown) having different physical properties. One of the conductive films is made of a metal having low resistivity, such as aluminum-based metal, silver-based metal, or copper-based metal, so as to reduce signal delay or voltage drop. In contrast, other conductive films are made of other materials, particularly materials having excellent physical, chemical, and electrical contact properties with indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metals, chromium, tantalum, and titanium. Good examples of such a combination include a chromium bottom film, an aluminum (alloy) top film, and an aluminum (alloy) bottom film and a molybdenum (alloy) top film. However, the gate line 121 and the storage electrode line 131 may be made of various other metals or conductors.

Side surfaces of the gate line 121 and the storage electrode line 131 are inclined with respect to the surface of the substrate 110, and the inclination angle is preferably about 30 ° to about 80 °.

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

A plurality of linear semiconductors 151 made of hydrogenated amorphous silicon (hereinafter referred to as a-Si) or polysilicon are formed on the gate insulating layer 140. The linear semiconductor 151 mainly extends in a vertical direction and includes a plurality of projections 154 extending toward the gate electrode 124. The linear semiconductor 151 has a wider width in the vicinity of the gate line 121 and the storage electrode line 131 and covers them widely.

A plurality of linear and island ohmic contacts 161 and 165 are formed on the semiconductor 151. The ohmic contacts 161 and 165 may be made of a material such as n + hydrogenated amorphous silicon in which n-type impurities such as phosphorus are heavily doped, or may be made of silicide. The linear ohmic contact 161 has a plurality of protrusions 163, and the protrusion 163 and the island-type ohmic contact 165 are paired and disposed on the protrusion 154 of the semiconductor 151.

Side surfaces of the semiconductor 151 and the ohmic contacts 161 and 165 are also inclined with respect to the surface of the substrate 110, and the inclination angle is about 30 ° to 80 °.

A plurality of data lines 171 and a plurality of drain electrodes 175 are formed on the ohmic contacts 163 and 165 and the gate insulating layer 140.

The data line 171 transmits a data signal and mainly extends in the vertical direction to cross the gate line 121. Each data line 171 also crosses the storage electrode line 131 and runs between adjacent sets of storage electrodes 133a and 133b. Each data line 171 includes a plurality of source electrodes 173 extending toward the gate electrode 124 and an end portion 179 having a large area for connection with another layer or an external driving circuit. A data driving circuit (not shown) for generating a data signal may be mounted on a flexible printed circuit film (not shown) attached to the substrate 110, directly mounted on the substrate 110, or mounted on the substrate 110. Can be integrated. When the data driving circuit is integrated on the substrate 110, the data line 171 may be extended to be directly connected to the data driving circuit.

The drain electrode 175 is separated from the data line 171 and faces the source electrode 173 around the gate electrode 124. Each drain electrode 175 includes one wide end and the other end having a rod shape. The wide end portion overlaps the storage electrode line 131, and the rod-shaped end portion is partially surrounded by the bent source electrode 173.

One gate electrode 124, one source electrode 173, and one drain electrode 175 together with the protrusion 154 of the semiconductor 151 form one thin film transistor (TFT). A channel of the transistor is formed in the protrusion 154 between the source electrode 173 and the drain electrode 175.

The data line 171 and the drain electrode 175 are preferably made of a refractory metal such as molybdenum, chromium, tantalum, and titanium, or an alloy thereof, and include a refractory metal film (not shown) and a low resistance conductive film. It may have a multilayer structure including (not shown). Examples of the multilayer structure include a double layer of chromium or molybdenum (alloy) lower layer and an aluminum (alloy) upper layer, and a triple layer of molybdenum (alloy) lower layer and aluminum (alloy) interlayer and molybdenum (alloy) upper layer. However, the data line 171 and the drain electrode 175 may be made of various metals or conductors.

The side of the data line 171 and the drain electrode 175 may also be inclined at an inclination angle of about 30 ° to about 80 ° with respect to the surface of the substrate 110.

The ohmic contacts 161 and 165 exist only between the semiconductor 151 below and the data line 171 and the drain electrode 175 thereon, and lower the contact resistance therebetween. Although the linear semiconductor 151 is narrower than the data line 171 in most places, as described above, the width of the linear semiconductor 151 is widened at the portion where it meets the gate line 121 to smooth the profile of the surface, thereby disconnecting the data line 171. prevent. The semiconductor 151 has an exposed portion between the source electrode 173 and the drain electrode 175, and not covered by the data line 171 and the drain electrode 175.

A passivation layer 180 is formed on the data line 171, the drain electrode 175, and the exposed semiconductor 151. The passivation layer 180 may be made of an inorganic insulator or an organic insulator, and may have a flat surface. Examples of the inorganic insulator include silicon nitride and silicon oxide. The organic insulator may have photosensitivity and the dielectric constant is preferably about 4.0 or less. However, the passivation layer 180 may have a double layer structure of the lower inorganic layer and the upper organic layer so as not to damage the exposed portion of the semiconductor 151 while maintaining excellent insulating properties of the organic layer.

In the passivation layer 180, a plurality of contact holes 182 and 185 exposing the end portion 179 and the drain electrode 175 of the data line 171 are formed, respectively, and the passivation layer 180 and the gate insulating layer are formed. In the 140, a plurality of contact holes 181 exposing the end portion 129 of the gate line 121 and a plurality of contact holes 183a exposing a part of the storage electrode line 131 near the fixed end of the first storage electrode 133a. And a plurality of contact holes 183b exposing the protruding portion of the free end of the first storage electrode 133a.

A plurality of pixel electrodes 191, a plurality of overpasses 83, and a plurality of contact assistants 81 and 82 are formed on the passivation layer 180. They may be made of a transparent conductive material such as ITO or IZO or a reflective metal such as aluminum, silver, chromium or an alloy thereof.

The pixel electrode 191 is physically and electrically connected to the drain electrode 175 through the contact hole 185 and receives a data voltage from the drain electrode 175. The pixel electrode 191 to which the data voltage is applied is generated between the two electrodes 191 and 270 by generating an electric field together with the common electrode 270 of the other display panel 200 to which the common voltage is applied. The direction of liquid crystal molecules (not shown) of the liquid crystal layer 3 is determined. The polarization of light passing through the liquid crystal layer 3 varies according to the direction of the liquid crystal molecules determined as described above. The pixel electrode 191 and the common electrode 270 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.

The pixel electrode 191 overlaps the storage electrode line 131 including the storage electrodes 133a and 133b. A capacitor in which the pixel electrode 191 and the drain electrode 175 electrically connected thereto overlap with the storage electrode line 131 is called a "storage capacitor", and the storage capacitor enhances the voltage holding capability of the liquid crystal capacitor. .

The contact auxiliary members 81 and 82 are connected to the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 through the contact holes 181 and 182, respectively. The contact auxiliary members 81 and 82 compensate for and protect the adhesion between the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 and the external device. The connecting leg 83 crosses the gate line 121 and exposes the exposed portion of the storage electrode line 131 and the storage electrode through contact holes 183a and 183b positioned on opposite sides with the gate line 121 interposed therebetween. 133b) is connected to the exposed end of the free end. The storage electrode lines 131 including the storage electrodes 133a and 133b may be used together with the connection legs 83 to repair defects in the gate line 121, the data line 171, or the thin film transistor.

Next, the color filter display panel 200 will be described with reference to FIGS. 2 and 3.

A light blocking member 220 is formed on an insulating substrate 210 made of transparent glass, plastic, or the like. The light blocking member 220 is also called a black matrix and prevents light leakage.

The light blocking member 220 has a plurality of openings 225 facing the pixel electrode 191 and having substantially the same shape as the pixel electrode 191, and prevents light leakage between the pixel electrodes 191. However, the light blocking member 220 may include a portion corresponding to the gate line 121 and the data line 171 and a portion corresponding to the thin film transistor.

The light blocking member 220 of the liquid crystal display according to the exemplary embodiment of the present invention preferably has a concave portion 226 having a center recessed therein.

The light blocking member 220 serves as a partition wall confined to the opening 225 confining the color filter ink during the manufacturing process of the color filter display panel using the inkjet printing system. At this time, the concave portion 226 formed in the center portion of the light blocking member 220 is dipped in the color filter ink into the opening 225 formed by being surrounded by the light blocking member 220, and then filled with the opening 225. When the ink exceeds the light blocking member 220, the ink may be confined to prevent the ink from being mixed with the ink dropped in the side opening 225.

A plurality of color filters 230 is also formed on the substrate 210. The color filter 230 is mostly present in the region 225 surrounded by the light blocking member 230, and may extend in the vertical direction along the column of the pixel electrodes 191. Each color filter 230 may display one of primary colors such as three primary colors of red, green, and blue. The color filter 230 is preferably formed using an inkjet printing system.

An overcoat 250 is formed on the color filter 230 and the light blocking member 220. The overcoat 250 may be made of an (organic) insulator, which prevents the color filter 230 from being exposed and provides a flat surface. The overcoat 250 may be omitted.

The common electrode 270 is formed on the overcoat 250. The common electrode 270 is made of a transparent conductor such as ITO or IZO.

Alignment layers 11 and 21 are coated on inner surfaces of the display panels 100 and 200, and the alignment layers 11 and 21 may be horizontal alignment layers or vertical alignment layers. Polarizers 12 and 22 are provided on the outer surfaces of the display panels 100 and 200, and the polarization axes of the two polarizers 12 and 22 are orthogonal and one of the polarization axes is parallel to the gate line 121. desirable. In the case of a reflective liquid crystal display, one of the two polarizers 12 and 22 may be omitted.

The liquid crystal display according to the present exemplary embodiment may further include a phase retardation film (not shown) for compensating for the delay of the liquid crystal layer 3. The liquid crystal display may also include a polarizer 12 and 22, a phase retardation film, display panels 100 and 200, and a backlight unit (not shown) for supplying light to the liquid crystal layer 3.

Next, a color filter for a liquid crystal display and a method of manufacturing the same according to an embodiment of the present invention will be described in detail with reference to FIGS. 5A to 5D.

5A through 5D are cross-sectional views illustrating a manufacturing process of a color filter display panel 200 for a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 5A, a light blocking member 220 having a recess 226 in the center is formed on the substrate 210. The light blocking member 220 may be formed of an organic layer including a black pigment. In this case, the photosensitive light blocking member 220 layer may be stacked on the substrate, and then exposed and developed to form a light blocking member 220 having a desired shape. The light blocking member 220 may include a recess 226 having a low height. And a translucent area in addition to a light transmitting area and a light blocking area in a photomask used when exposing the light blocking member 220 layer, thus having a low height recess 226. ) Can be formed. Alternatively, the mold may be formed in an imprint method by using a mold having the same shape as that of the light blocking member 220 having the recess 220.

Next, as shown in FIG. 5B, the color filter ink 5 is applied from the nozzle of the head of the inkjet printing system 500 to the opening 225 defined by the light blocking member 220 having the recess 226. Dropping The ink 5 may be a pigment spray ink in which a pigment representing color is dispersed in a solvent.

As shown in FIG. 5C, the amount of ink 5 dripping from the nozzle of the inkjet head is smaller than that of the opening 5 to prevent the amount of the ink 5 so that the color filter 230 is formed lower than the light blocking member 220. It is preferred that 225) be larger than the capacity it can hold. However, it is preferable that the amount of the ink 5 exceeding the capacity of the opening 225 is less than the amount of the ink 5 that the recess 226 of the light blocking member 220 can contain.

5C shows a state immediately after dropping the ink 5, since the amount of the ink 5 dropped is larger than the capacity that the opening 225 can contain, as well as the opening 225 immediately after printing as shown in FIG. 5C. It is also present on the light blocking member 220. Since the light blocking member 220 according to the exemplary embodiment of the present invention has a recess 226 in the center, the remaining ink 5 existing on the light blocking member 220 is collected in the recess 226.

Next, referring to FIG. 5D, the printed color filter ink 5 is cured to dry the solvent of the ink 5 to form the color filter 230. At this time, the ink 5 existing above the light blocking member 220 beyond the opening 225 immediately after printing is cured in the recess 226 of the light blocking member 220.

As such, since the light blocking member 220 of the liquid crystal display according to the exemplary embodiment of the present invention has a recess 226 having a low height at the center, when the color filter 230 is formed using an inkjet printing system, Since the ink 5 beyond the opening 225 surrounded by the light blocking member 220 can be confined to the recess 226 of the light blocking member 220, the side opening ( Mixing with the ink of 225 can be prevented. In addition, the ink 5 may be dropped more than the capacity of the opening 225, so that the height of the color filter 230 is lower than that of the light blocking member 220.

The light blocking member of the liquid crystal display according to the present invention has a recess having a lower height than the center portion, so that when the color filter is formed using an inkjet printing system, the color filter ink beyond the light blocking member is confined in the recess. In addition, the color filter ink beyond the light blocking member can be prevented from being mixed with the color filter ink of the next pixel, thereby allowing a sufficient amount of the color filter ink to be jetted so that a color filter having a height lower than that of the light blocking member is obtained. It can be prevented from forming.

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.

Claims (8)

A plurality of partition walls formed on the substrate and defining a plurality of openings, and It includes a plurality of color filters formed in the plurality of openings, The partition wall has a concave portion having a lower height than the periphery in the center portion. In claim 1, The partition wall is a display panel for a liquid crystal display device that is a light blocking member. In claim 1, And a field generating electrode formed on the substrate. First substrate, A gate line and a data line formed on the first substrate; A thin film transistor connected to the gate line and the data line, A pixel electrode connected to the thin film transistor, A second substrate facing the first substrate, A light blocking member formed on the second substrate, A color filter formed on the second substrate and the light blocking member; and It includes a common electrode formed on the color filter, The light blocking member has a concave portion having a lower height than a periphery in a central portion thereof. In claim 4, The liquid crystal display device in which the color filter is formed in the said recessed part. Preparing the substrate, Forming a light blocking member having a concave portion having a low height of a central portion on the substrate; Using an inkjet printing system, dropping ink for color filters in an area defined by the light blocking member; and And curing the loaded ink to dry the solvent of the ink. In claim 6, Forming the light blocking member Stacking a light blocking member layer on the substrate, and Exposing and developing the light blocking member layer; The exposure is a display panel manufacturing method for a liquid crystal display device using an optical mask having a light transmitting region, a light blocking region, and a semi-transmissive region. In claim 6, Forming the light blocking member Stacking a light blocking member layer on the substrate, and And imprinting said light blocking member layer using a mold such as a shape of a light blocking member having a low height of a center portion.

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