KR20090042352A - Liquid crystal display device and method of fabricating the same - Google Patents

Abstract

A liquid crystal display device and a manufacturing method thereof are provided to increase the mechanical strength of a flat panel display device. A color filter substrate(100) filters the passing white light to display an image having a color. A TFT substrate(200) is arranged so as to be opposite to the color filter substrate and is spaced apart from each other at predetermined intervals. A liquid crystal layer(300) is interposed between the color filter substrate and TFT substrate. The liquid crystal layer controls the amount of the passing light. A spacer(400) is interposed between the color filter substrate and TFT substrate to maintain the cell gap therebetween.

Description

Liquid crystal display and its manufacturing method {LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF FABRICATING THE SAME}

Embodiments relate to a liquid crystal display and a method of manufacturing the same.

As the information society develops, the demand for display devices is increasing in various forms. Various flat panel display devices such as liquid crystal displays (LCDs), plasma display panels (PDPs), and electro luminescent displays (ELDs) are being utilized.

In addition, as the size and size of a flat panel display device become smaller, it is important to increase the mechanical strength of the flat panel display device.

Embodiments provide a liquid crystal display device having high mechanical strength.

The liquid crystal display according to the embodiment includes a flexible first substrate, a second substrate disposed to face the first substrate, and a liquid crystal layer interposed between the first substrate and the second substrate.

The liquid crystal display according to the embodiment includes a flexible first substrate and a rigid second substrate than the first substrate.

Therefore, the flexible first substrate is not broken, the strength of the liquid crystal display device depends on the second substrate, and the liquid crystal display device is supported by the second substrate.

Accordingly, since the first substrate is not broken, even if the thickness of the first substrate is thinned, the strength of the liquid crystal display device is improved as the thickness of the second substrate is increased without affecting the strength of the liquid crystal display device.

Therefore, the liquid crystal display according to the embodiment has a high mechanical strength when the thickness of the second substrate is larger than the thickness of the first substrate.

1 is a cross-sectional view illustrating a cross section of a liquid crystal display according to an embodiment.

Referring to FIG. 1, the liquid crystal display includes a color filter substrate 100, a TFT substrate 200, a liquid crystal layer 300, and a spacer 400.

The color filter substrate 100 filters the white light passing through and displays an image having color. The color filter substrate 100 includes a film substrate 110 and color filters 120.

The film substrate 110 is transparent and flexible. The film substrate 110 is, for example, a film. The film substrate 110 has a plurality of grooves corresponding to each pixel. The thickness H3 of the film substrate 110 is, for example, about 0.09 mm to 0.11 mm.

The color filters 120 are disposed inside the grooves. The color filters 120 are disposed, for example, one for each pixel.

The color filters 120 may be, for example, red color filters, green color filters, and blue color filters. The red color filters filter white light to generate red light, the green color filters filter white light to generate green light, and the blue color filters filter white light to generate blue light.

The color filter substrate 100 may include, for example, a black matrix pattern. The black matrix pattern is formed around the color filters 120 and is disposed in an area on the film substrate 110 where the groove is not formed.

The black matrix pattern blocks light and improves characteristics of an image generated through the color filter substrate 100.

The TFT substrate 200 is disposed to face the color filter substrate 100 and spaced apart at predetermined intervals. The TFT substrate 200 includes a glass substrate 210 and a wiring layer 220.

The glass substrate 210 faces the film substrate 110 and is spaced apart from each other. The glass substrate 210 is transparent and has a higher strength than the film substrate 110. That is, the glass substrate 210 is less curved than the film substrate 110.

In addition, the glass substrate 210 is more rigid than the film substrate 110 and less flexible than the film substrate 110.

The glass substrate 210 has a greater thickness than the film substrate 110. For example, the thickness H4 of the glass substrate 210 is about 4 to 6 times thicker than the thickness H3 of the film substrate 110. For example, the thickness H3 of the film substrate 110 is about 0.09 mm to 0.11 mm, and the thickness H4 of the glass substrate 210 is about 0.4 mm to about 0.6 mm.

Alternatively, the TFT substrate 200 may include, for example, a quartz substrate instead of the glass substrate 210, and the thickness of the quartz substrate may be equal to the thickness H4 of the glass substrate 210. Can be.

The wiring layer 220 is disposed on the glass substrate 210. The wiring layer 220 forms a predetermined electric field for each pixel. The wiring layer 220 includes, for example, a gate wiring, a data wiring, a thin film transistor, a common electrode, and a pixel electrode.

A plurality of gate wirings are formed on the glass substrate 210 so as to extend in one direction.

A plurality of data lines are arranged to cross the gate lines.

The thin film transistor is disposed on the glass substrate 210. The thin film transistor transmits a signal applied through the data line to the pixel electrode according to a signal applied through the gate line.

The pixel electrode is electrically connected to the thin film transistor, and receives a data signal applied through the data line.

The common electrode is formed on the glass substrate 210 and is alternately disposed with respect to the pixel electrode. The common electrode receives a common voltage.

An electric field is formed by the voltage difference between the pixel electrode and the common electrode.

The liquid crystal layer 300 is interposed between the color filter substrate 100 and the TFT substrate 200. The liquid crystal layer 300 is aligned by the electric field for each pixel, and adjusts the amount of light passing through the liquid crystal layer 300.

The spacer 400 is interposed between the color filter substrate 100 and the TFT substrate 200. The spacer 400 maintains a cell gap between the color filter substrate 100 and the TFT substrate 200. Examples of the material that can be used as the spacer 400 may include an acrylic resin.

The spacer 400 is fixed to the color filter substrate 100 and the TFT substrate 200, for example. For example, the spacer 400 may be integrally formed on the film substrate 110 and adhered to the TFT substrate 200.

For example, the spacer 400 extends in the first direction and may have a bar shape. Alternatively, the spacer 400 may have, for example, a columnar shape.

In addition, the spacer 400 may be disposed between, for example, each pixel. In addition, the spacer 400 has elasticity, and restores the color filter substrate 100 again when the color filter substrate 100 is deformed by an external touch or the like. That is, the spacer 400 improves the restoring force of the color filter substrate 100.

The spacer 400 and the film substrate 110 may be integrally formed, for example.

The components in FIG. 1 are exaggerated for the sake of explanation, and as shown in FIG. 1, the thickness of the wiring layer 220 is very small compared to the thickness H4 of the glass substrate 210. Therefore, the thickness H2 of the TFT substrate 200 is substantially influenced by the thickness H4 of the glass substrate 210, and the strength of the TFT substrate 200 is substantially influenced by the strength of the glass substrate 210. do.

In addition, since the thickness of the color filter 120 is very small compared to the thickness H3 of the film substrate 110, the thickness H1 and the strength of the color filter substrate 100 are greater than that of the film substrate 110. It is substantially influenced by the thickness H3 and the strength.

In addition, since the film substrate 110 is flexible, the film substrate 110 is not damaged, and the strength of the liquid crystal display according to the embodiment is substantially constrained by the strength of the glass substrate 210.

Therefore, when the color filter substrate and the TFT substrate are compared with the liquid crystal display device having glass substrates, the strength of the liquid crystal display device according to the embodiment is higher.

For example, it is assumed that the first liquid crystal display device has two glass substrates having a thickness of 0.3 mm, and the second liquid crystal display device has a glass substrate having a thickness of 0.1 mm and a glass substrate having a thickness of 0.5 mm.

In contrast, it is assumed that the third liquid crystal display device has a flexible film substrate having a thickness of 0.1 mm and a glass substrate having a thickness of 0.5 mm.

When pressure is applied perpendicularly to the center portion of the first liquid crystal display device, since pressure is applied to glass substrates having the same thickness, an impact is applied to the mutually opposite surfaces of the glass substrates having a thickness of 0.3 mm.

On the contrary, when pressure is applied vertically to the center portion of the second liquid crystal display device, since pressure is applied to glass substrates having different thicknesses, an impact is applied to the glass substrate having a thickness of 0.5 mm.

Since the glass substrate has a high probability of being broken when an impact is applied to the surface, the second liquid crystal display has a higher strength than the first liquid crystal display.

However, the glass substrate having a thickness of 0.1 mm included in the second liquid crystal display device is vulnerable to local impact. That is, a glass substrate having a thickness of 0.1 mm is susceptible to local impact.

In contrast, when pressure is applied perpendicularly to the center portion of the third liquid crystal display, an impact is applied to the inside of the glass substrate having a thickness of 0.5 mm. In addition, since the film substrate having a thickness of 0.1 mm is flexible, it is not broken by local impact.

Accordingly, the third liquid crystal display device is stronger in local impact as well as the pressure applied to the center portion, compared to the first and second liquid crystal display devices having the same thickness.

Therefore, the liquid crystal display device according to the embodiment is improved in strength, and can be manufactured more slim while having the same strength as the conventional liquid crystal display device.

2A to 2F are cross-sectional views and plan views illustrating a process according to a method of manufacturing a liquid crystal display device according to an embodiment. In particular, FIG. 2D is a plan view of disposing liquid crystal on the color filter substrate and the spacer.

Referring to FIG. 2A, a wiring layer 220 is formed on the glass substrate 210.

The glass substrate 210 may have, for example, a thickness of about 0.4 mm to about 0.6 mm.

The wiring layer 220 may include, for example, a plurality of gate wires, data wires crossing the gate wires, a thin film transistor electrically connected to the data wires, a pixel electrode electrically connected to the thin film transistor, It may be formed including a common electrode to which a common voltage is applied.

The wiring layer 220 may be formed by, for example, the following method.

A metal layer is formed on the glass substrate 210 and is patterned by a mask process to form a gate wiring, a gate electrode branching from the gate wiring, a common wiring parallel to the gate wirings, and a common wiring electrically connected to the common wiring. An electrode is formed.

Thereafter, an insulating film covering the glass substrate 210 is formed, a silicon film is stacked on the insulating film, and the silicon film is patterned by a mask process to form a channel pattern corresponding to the gate electrode.

Thereafter, a metal layer is formed on the insulating layer, and a data line crossing the gate line, a source electrode branched from the data line, and a drain electrode spaced apart from the source electrode and formed in correspondence with the channel pattern are formed.

In this way, a thin film transistor including the gate electrode, the channel pattern, the source electrode, and the drain electrode is formed.

Thereafter, a passivation layer is formed on the insulating layer, and a pixel electrode electrically connected to the drain electrode is formed on the passivation layer.

Referring to FIG. 2B, the film substrate 110 and the spacer 400 are integrally formed. In order to form the film substrate 110 and the spacer 400, a molding pattern 500 is disposed on the material for forming the film substrate 110 and the space (hereinafter, referred to as a material material).

The molding pattern 500 includes a molding protrusion corresponding to the groove to be formed in the film substrate 110 and a molding groove corresponding to the spacer 400.

Alternatively, a material material may be disposed on the molding pattern 500. In this case, the material material may be a liquid.

Examples of the material materials include films, polymers, acrylic resins, polyurethane resins, and the like.

Thereafter, the film substrate 110 and the spacer 400 are formed by applying heat and pressure to the molding pattern 500 and / or the material material. In this case, a groove is formed on the film substrate 110 corresponding to the pixel which is a unit for displaying an image.

In addition, a plurality of spacers 400 may be disposed to extend in a first direction, for example. For example, the spacer 400 may have a bar shape.

In addition, the film substrate 110 may be formed to have a thickness of, for example, about 0.09 mm to about 0.11 mm.

In addition, the film substrate 110 may be formed to have a thickness of about 1/4 to 1/6 of the thickness of the glass substrate 210.

Referring to FIG. 2C, a pigment or / and a dye having a color is formed inside the groove. In this case, for example, the pigment or / and dye is formed by the ink-jet method. For example, colored pigments and / or dye droplets 120a fall inside the grooves.

Thereafter, the pigment or / and dye disposed inside the groove is hardened, and the color filters 120 are formed.

The color filters 120 may be, for example, a red color filter, a green color filter, and a blue color filter.

Referring to FIG. 2D, an organic film is formed on the color filter substrate 100, and the organic film is oriented in the first direction to form an alignment film.

Thereafter, the liquid crystal 300a is disposed on the color filter substrate 100 and the spacer 400. In this case, the liquid crystal 300a extends in the second direction and is disposed to cross the spacer 400. For example, the second direction is a direction substantially perpendicular to the first direction.

Since the liquid crystal 300a is disposed in the second direction, even when the viscosity of the liquid crystal 300a is high, the liquid crystal 300a may be evenly disposed on the color filter substrate 100.

In particular, since the film substrate 110 is flexible, the spacer 400 is more closely disposed on the color filter substrate 100. Accordingly, the liquid crystal 300a is disposed on the spacer 400 in the second direction, and the liquid crystal 300a is evenly disposed on the color filter substrate 100.

Referring to FIG. 2E, the liquid crystal spreads in the first direction, and the liquid crystal layer 300 is formed on the color filter substrate 100. At this time, the liquid crystal disposed on the spacer 400 is removed.

Referring to FIG. 2F, the TFT substrate 200 including the glass substrate 210 and the wiring layer 220 is coupled to the spacer 400. In addition, the color filter substrate 100 and the TFT substrate 200 are coupled by a sealing member.

1 is a cross-sectional view illustrating a cross section of a liquid crystal display according to an embodiment.

2A to 2F are cross-sectional views and plan views illustrating a process according to a method of manufacturing a liquid crystal display device according to an embodiment.

Claims (13)

A flexible first substrate; A second substrate disposed to face the first substrate; And And a liquid crystal layer interposed between the first substrate and the second substrate. The liquid crystal display of claim 1, wherein a thickness of the first substrate is 0.09 mm to 0.11 mm, and a thickness of the second substrate is 0.4 mm to 0.6 mm. The liquid crystal display of claim 1, wherein the first substrate comprises a film, and the second substrate comprises glass or quartz. The liquid crystal display device of claim 1, wherein the thickness of the second substrate is about 4 to 6 times the thickness of the first substrate. The liquid crystal display device of claim 1, further comprising a spacer interposed between the first substrate and the second substrate. 6. The liquid crystal display of claim 5, wherein the first substrate and the spacer are integrally formed. The liquid crystal display of claim 5, wherein the spacer is fixed to the first substrate and the second substrate. Forming a flexible first substrate; Forming a second substrate that is rigider than the first substrate; And Forming a liquid crystal layer between the first substrate and the second substrate. The method of claim 8, wherein in the forming of the first substrate, the first substrate comprises a film, and in the forming of the second substrate, the second substrate includes glass or quartz. Method of manufacturing a liquid crystal display device. The method of claim 8, Forming the first substrate, Forming a groove in the film substrate; And And dropping a pigment into the groove to form a color filter. The method of claim 8, further comprising forming a plurality of spacers extending in a first direction on the first substrate. The method of claim 11, further comprising disposing an organic layer on the first substrate and orienting the organic layer on the first substrate to form an alignment layer. The method of claim 11, Forming the liquid crystal layer Disposing a liquid including liquid crystal on the first substrate in a second direction crossing the first direction; And And dispersing the liquid in the first direction.

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