KR20060016923A - Liquid Crystal Display and Manufacturing Method Thereof - Google Patents

Abstract

In the present invention, the alignment layer formed on the thin film transistor array panel and the color filter display panel is formed so that the vertical alignment region and the horizontal alignment region coexist.

By forming the liquid crystal display device such that the vertical alignment region and the horizontal alignment region coexist in the alignment layer, the side light leakage phenomenon is minimized and the alignment margin of the upper and lower substrates is increased to improve the production yield.

Liquid crystal, vertical alignment, horizontal alignment, liquid crystal display device

Description

Liquid crystal display and its manufacturing method {LIQUID CRYSTAL DISPLAY APPARATUS AND MANUFACTURING METHOD THEREOF}

1 illustrates a liquid crystal alignment state when an electric field is not applied to the liquid crystal display device according to the embodiment of the present invention.

2 illustrates a liquid crystal alignment state when an electric field is applied to the liquid crystal display device according to the embodiment of the present invention.

3 is a view illustrating an ion beam treatment process in order to allow a vertical alignment region and a horizontal alignment region to coexist in an alignment layer in an embodiment of the present invention.

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

100: thin film transistor array panel

175: data line 177: sustain electrode line

200: color filter display plate 250: common electrode

300: lower alignment layer 350: upper alignment layer

400: mask 450: blocking area

500: liquid crystal 900: pixel electrode

The present invention relates to a liquid crystal display device.

In general, a liquid crystal display (LCD) device includes a thin film transistor array panel on which gate lines, data lines, thin film transistors, and pixel electrodes are formed, a color filter display panel on which color filters and a common electrode are formed, and a thin film transistor display panel. It consists of a liquid crystal layer etc. which are filled between a display panel and a color filter display panel.

In the LCD device, light transmittance changes as the liquid crystal rotates due to an electric field formed between the pixel electrode and the common electrode, and an image is displayed according to the change of the transmittance. The electric field formed between the pixel electrode and the common electrode is controlled by the pixel electrode, and the voltage of the pixel electrode is controlled through a switching element called a thin film transistor. Here, the thin film transistor transfers or blocks the image signal transmitted along the data line to the pixel electrode by the scan signal transmitted along the gate line.

When the voltage is not applied to the pixel electrode and the common electrode, the liquid crystal layers are arranged in a predetermined direction by an alignment layer formed on the surfaces of the thin film transistor array panel and the color filter display panel, and when the voltage is applied, the liquid crystal rotates according to the direction of the electric field. do.

The present invention relates to a liquid crystal display device using a twisted nematic (TN) liquid crystal, wherein the direction of the electric field in the liquid crystal region between the pixel electrode and the pixel electrode of the thin film transistor array panel is different from the direction of the electric field formed on the pixel electrode. Otherwise, disclination occurs in which the direction of the liquid crystal is distorted. Such disclination causes light to leak out and cause a problem in the displayed image. This problem is exacerbated in the state of representing black to which the maximum voltage is applied in normally white mode. In particular, the data voltage applied to the data line fluctuates at 60 Hz per second, so that the discretization is diffused to the inside of the pixel area, which causes deterioration of display quality.

Conventionally, in order to solve the problem caused by the discretization, a black matrix is formed on the color filter panel to cover this part. However, in the current pixel structure, there is a high possibility that misalignment occurs when the upper and lower panels are combined, and when misalignment occurs, Problems occur with the image.

In order to prevent this, when a larger black matrix is formed, a problem arises in the aperture ratio of the liquid crystal display.

An object of the present invention is to provide a liquid crystal display device having a structure that minimizes the distortion of the liquid crystal generated by the disclination.

In order to solve this problem, the vertical alignment portion and the horizontal alignment portion coexist in the alignment layer formed on the thin film transistor array panel and the color filter display panel to minimize the direction distortion of the liquid crystal.

Specifically, a thin film transistor array panel including a thin film transistor, a pixel electrode, and a lower alignment layer, a color filter display panel including a common electrode and an upper alignment layer, and a liquid crystal interposed between the thin film transistor array panel and the color filter display panel. The lower alignment layer and the upper alignment layer are for a liquid crystal display device having a horizontal alignment region and a vertical alignment region together.

Forming a thin film transistor array panel including a thin film transistor, a pixel electrode, and a lower alignment layer, and a color filter display panel including a common electrode and an upper alignment layer, irradiating an ion beam to the upper alignment layer and the lower alignment layer by using a mask; A method of manufacturing a liquid crystal display device comprising combining a thin film transistor array panel and the color filter panel and injecting a liquid crystal therebetween.

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 liquid crystal display and a manufacturing method thereof according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

The present invention relates to a liquid crystal display device, wherein the liquid crystal display device includes a thin film transistor array panel 100 including a thin film transistor, a color filter display panel 200 including a common electrode and a color filter, and the thin film transistor array panel 100. And a liquid crystal 500 interposed between the color filter display panel 200 and the color filter panel 200.

In detail, each of the thin film transistor array panel 100 has a gate line and a data line, and has a pixel area defined by the gate line and the data line. A thin film transistor is formed in a portion of the pixel region, and the pixel electrode formed in the pixel region is controlled by the thin film transistor. The thin film transistor controls the pixel electrode. When the voltage input through the gate line is higher than or equal to a predetermined level, the thin film transistor transfers the voltage coming into the data line from the source side to the drain side of the thin film transistor, and corresponds to the pixel electrode connected to the drain electrode. This is to take.

The lower alignment layer 300 is formed on the thin film transistor array panel 100 formed as described above.

Meanwhile, when the color filter display panel 200 is described in detail, a color filter is formed on the color filter display panel 200, and a common electrode 250 is formed thereon. An upper alignment layer 350 is formed on the common electrode 250.

The liquid crystal 500 is inserted between the lower alignment layer 300 of the thin film transistor array panel 100 and the upper alignment layer 350 of the color filter display panel 200. The liquid crystal 500 is vertically or horizontally aligned according to the alignment layer. The alignment film for vertically aligning the liquid crystal is called a vertical alignment film, and the alignment film for horizontal alignment is called a horizontal alignment film. In this embodiment, a vertical alignment layer is used as the upper alignment layer 350 and the lower alignment layer 300.

A plurality of protrusions are formed on the surface of the vertical alignment layer to align the liquid crystals vertically. However, when the ion beam is irradiated to the protrusions, the protrusions lose the force of vertically aligning the liquid crystals, and thus the liquid crystals are not aligned vertically. In this case, the liquid crystal is horizontally aligned at a slight angle with respect to the horizontal plane.

The angle of the liquid crystal with respect to the horizontal plane and the direction in which the liquid crystal is aligned in the horizontal alignment are affected by the angle and the direction in which the ion beam is irradiated. The liquid crystal is horizontally aligned in the direction of irradiating the ion beam, and when the angle of the ion beam is formed with the horizontal plane is 30 degrees, the liquid crystal is horizontally aligned with an angle of 4-5 degrees with respect to the horizontal plane.

According to the present invention, after the vertical alignment layer is formed on the thin film transistor array panel 100 and the color filter panel 200, the upper portion of the thin film transistor array panel 100 in which the pixel electrode 900 is formed and the upper portion opposite thereto are irradiated with an ion beam. To form a horizontal alignment region. A portion where the pixel electrode 900 is not formed and an upper portion opposite to the pixel electrode 900 are formed as vertical alignment regions without irradiating an ion beam. That is, as shown in FIGS. 1 and 2, the region in which the data line 175 is formed is formed as a vertical alignment region because the pixel electrode 900 is not formed, and the portion in which the gate line is formed is also a vertical alignment region although not illustrated. Form. The processing performed in the upper region of the data line 175 is the same as the processing performed in the upper region of the gate line (not shown).

3 illustrates a process of irradiating an ion beam to the lower alignment layer 300 of the thin film transistor array panel 100 using the mask 400. The ion beam is irradiated with a constant tilt and direction as shown. The pretilt direction of the liquid crystal oriented horizontally is determined by the direction in which the ion beam is irradiated. As described above, when the angle formed by the ion beam with the horizontal plane is 30 degrees, the liquid crystal is horizontally aligned while forming an angle of 4-5 degrees with respect to the horizontal plane. An ion beam blocking region 450 and other transmission regions are formed in the mask 400. The mask 400 is aligned in consideration of the direction and angle at which the ion beam is irradiated so that a region in which the ion beam is blocked in the thin film transistor substrate 100 is formed between the pixel electrode 900 and the pixel electrode 900. As a result of irradiating the ion beam, the entire alignment layer was initially formed as a vertical alignment region. However, the ion beam is irradiated onto the pixel electrode 900 to be changed to a horizontal alignment region by the ion beam treatment, thereby changing the pixel electrode 900 and the pixel electrode. Between 900, the ion beam is not irradiated so that it still exists as a vertical alignment region.

As well as the thin film transistor array panel 100, the color filter panel 200 is subjected to an ion beam treatment process using the mask 400 as shown in FIG. 3, and a horizontal alignment region is formed at the same position as the thin film transistor array panel 100. Irradiate the ion beam to That is, when the color filter display panel 200 is combined with the thin film transistor array panel 100, the horizontal alignment region is formed on the portion where the pixel electrode 900 of the thin film transistor array panel 100 is positioned, and the thin film transistor array panel ( In order to form a vertical alignment region between the pixel electrode 900 and the pixel electrode 900 of the 100, the mask 400 is positioned and ion beam treatment is performed.

After the thin film transistor array panel 100 and the color filter panel 200 are combined, the liquid crystal 500 is inserted. In this embodiment, a twisted nematic liquid crystal is inserted.

1 and 2 illustrate a liquid crystal arrangement state when an electric field is not applied to the liquid crystal display and when an electric field is applied.

First, FIG. 1 shows a liquid crystal array state when no electric field is applied. Since no separate electric field is applied to FIG. 1, the liquid crystals are arranged as guided by the alignment film. Therefore, the liquid crystal on the pixel electrode 900 is horizontally aligned and vertically aligned between the pixel electrode 900 and the pixel electrode 900. In the boundary portion of the pixel electrode 900, there is a portion where the liquid crystal alignment is disturbed due to the influence of the vertical alignment and the horizontal alignment of both sides.

2 shows a liquid crystal array state when an electric field is applied. An electric field is a voltage applied to the pixel electrode 900 so that an electric field is generated between the common electrode 250, and an electric field is formed above the pixel electrode 900 to face the upper part. An electric field is formed between the pixel electrodes 900 with a horizontal component. Therefore, the liquid crystal is distributed along the direction of the electric field on the pixel electrode 900. That is, as shown in the figure, the pixel electrode 900 is arranged in the vertical direction, but has a horizontal alignment component in the vicinity of both substrates due to the horizontal alignment layer caused by the ion beam. In addition, the vertical arrangement is performed between the pixel electrode 900 and the pixel electrode 900 under the influence of an electric field.

Therefore, the black expression in which the maximum voltage is applied in the normally white mode does not have a problem of light leakage because the liquid crystal is uniformly formed in the vertical direction as a whole.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, the liquid crystal display is formed such that the vertical alignment region and the horizontal alignment region coexist in the alignment layer, thereby minimizing side light leakage and increasing alignment margin of the upper and lower substrates, thereby improving production yield.

Claims (11)

A thin film transistor array panel including a thin film transistor, a pixel electrode, and a lower alignment layer, A color filter display panel including a common electrode and an upper alignment layer, A liquid crystal interposed between the thin film transistor array panel and the color filter panel; And a horizontal alignment region and a vertical alignment region in the lower alignment layer and the upper alignment layer. In claim 1, The horizontal alignment region is formed on the upper alignment layer and the lower alignment layer formed on the pixel electrode, The vertical alignment area is a liquid crystal display device formed in a region other than the horizontal alignment area. The method of claim 1 or 2, The horizontal alignment region of the lower alignment layer and the horizontal alignment region of the upper alignment layer are symmetrical with each other with the liquid crystal interposed therebetween, and the vertical alignment region of the lower alignment layer and the vertical alignment region of the upper alignment layer are also symmetrical with each other with the liquid crystal interposed therebetween. Liquid crystal display device. In claim 1, Wherein the liquid crystal is a twisted nematic liquid crystal. In claim 1, The vertical alignment region and the horizontal alignment region are formed by irradiating an ion beam on the upper alignment layer and the lower alignment layer. In claim 5, The upper alignment layer and the lower alignment layer use a vertical alignment layer, and form a horizontal alignment region by irradiating an ion beam to a portion to be a horizontal alignment region using a mask on the vertical alignment layer. Forming a thin film transistor array panel including a thin film transistor, a pixel electrode, and a lower alignment layer, and a color filter panel including a common electrode and an upper alignment layer; Irradiating an ion beam on the upper alignment layer and the lower alignment layer by using a mask; Combining the thin film transistor array panel and the color filter panel and injecting liquid crystal therebetween. In claim 7, And a region in which the ion beam is irradiated in the irradiating an ion beam using the mask is an upper portion of the pixel electrode in a lower alignment layer and an upper portion of the pixel electrode in combination with the thin film transistor array panel in an upper alignment layer. In claim 7 or 8, And the lower alignment layer and the upper alignment layer are vertical alignment layers. In claim 7, And the ion beam is irradiated at an angle to the substrate. In claim 10, And the angle at which the ion beam is irradiated is 30 degrees.

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