KR20040071519A - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device is disclosed. An alignment mark is formed by forming an opening on the light blocking film in order to form an alignment mark in a liquid crystal display device having no gate driving IC and thus hardly attaching an edge grinding or a polarizing plate. The alignment mark is formed only on the light blocking film of the first substrate of the liquid crystal display device. Alternatively, the alignment mark is formed to face the light blocking film of the first substrate of the liquid crystal display and the second substrate facing the first substrate. Alternatively, the alignment mark is formed only on the first substrate of the liquid crystal display device, and a sealing member having a higher brightness than the light blocking film is disposed under the alignment mark. Overcoming the limitations of forming the alignment mark overcomes the process defects in the edge grinding process or the polarizer attachment process.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal having an alignment mark suitable for attaching edge grinding and a polarizing plate in a liquid crystal display device without a gate driving IC. It relates to a display device.

Recently, a liquid crystal display device having a new structure capable of displaying a display without a gate driver IC has been developed by technology development of a liquid crystal display device. Such a liquid crystal display without a gate driving IC is described in Korean Patent Application No. 2002-3398, filed Jan. 21, 2002, "Shift Register, Liquid Crystal Display Using the Same, and Method for Driving a Gate Line and Data Line Block." Is disclosed.

The liquid crystal display device without the gate driver IC does not require a separate mounting area for mounting the gate driver IC, and thus has an advantage of manufacturing a more compact liquid crystal display device.

However, the liquid crystal display device without the gate driver IC generates another problem that has not occurred conventionally as the space for mounting the gate driver IC is removed.

Problems occur in the process of preventing the breakage of the liquid crystal display panel by grinding the edges of the liquid crystal display panel and in attaching the polarizing plate to the liquid crystal display panel.

In general, the edge grinding process of the liquid crystal display panel is performed in the order that the grinding facility determines the position of the liquid crystal display panel with a CCD camera or the like and then grinds the edge of the liquid crystal display panel with a grinder. In addition, the attachment of the polarizer also proceeds in the order that the facility with the polarizer attaches the polarizer to the liquid crystal display panel after determining the position of the liquid crystal display panel with a CCD camera or the like.

The edge grinding facility or the polarizer attachment device recognizes an alignment mark formed on the liquid crystal display panel to determine the position of the liquid crystal display panel.

Therefore, the conventional liquid crystal display panel forms an alignment mark where the data driver IC and the gate driver IC are installed, so that there is no problem in edge grinding or polarizer attachment.

However, a liquid crystal display device without a gate driver IC is covered with a color filter substrate even if an alignment mark is formed on the TFT substrate, so that the CCD camera cannot recognize the alignment mark. The alignment mark is not seen by the color filter substrate because the black matrix formed at the edge of the color filter substrate covers the alignment mark.

Therefore, the liquid crystal display device without the gate driver IC cannot use the edge grinding equipment or the polarizer attachment equipment that has been conventionally used, and it is necessary to use the new edge grinding equipment or the polarizer attachment equipment suitable for the liquid crystal display device without the gate driver IC. Have In addition, since the alignment mark is covered by the black matrix, the alignment mark is not accurately recognized, and thus there is a problem in that edge grinding defects and polarizer adhesion defects occur.

Accordingly, the present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a liquid crystal display device having an alignment mark that can be recognized by an edge grinding facility or a polarizer attachment facility.

1 is a conceptual diagram of a liquid crystal display according to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along line B-B in FIG. 1.

4 is a cross-sectional view showing a liquid crystal display device according to a first embodiment of the present invention.

5 is a plan view illustrating a liquid crystal display according to a second exemplary embodiment of the present invention.

6 is a cross-sectional view taken along the line C-C of FIG.

7 is a plan view of a liquid crystal display according to a third exemplary embodiment of the present invention.

FIG. 8 is a cross-sectional view taken along the line D-D of FIG. 7.

9 is a plan view of a liquid crystal display according to a fourth embodiment of the present invention.

10 is a cross-sectional view taken along line E-E of FIG. 9.

In order to achieve the object of the present invention, the present invention provides a light blocking film covering an outer portion of a first liquid crystal display area formed on a first transparent substrate, and a first alignment mark formed by removing a part of the light blocking film. A liquid crystal display comprising a substrate, a second substrate including a second liquid crystal display region formed on a second transparent substrate so as to face the first liquid crystal display region, and a liquid crystal disposed between the first substrate and the second substrate.

According to the present invention, since there is no gate driving IC, the space constraint for forming the alignment mark is overcome by the method of forming the alignment mark on the light shielding film, thereby greatly reducing the process defect in the edge grinding process or the polarizing plate attachment process.

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

1 is a conceptual diagram of a liquid crystal display according to the present invention. 2 is a cross-sectional view taken along the line A-A of FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1.

Referring to FIG. 1 or 3, the liquid crystal display device 400 includes a first substrate 100, a second substrate 200, and a liquid crystal 300.

Referring to FIG. 2, the first substrate 100 includes a first transparent substrate 110, a first light blocking layer 120, and a first alignment mark 130.

The first transparent substrate 110 preferably has a rectangular plate shape and has a first liquid crystal display region 115. The first liquid crystal display region 115 resembles the first transparent substrate 110 and has a planar area that is somewhat smaller than that of the first transparent substrate 110, and the first liquid crystal display region 115 has a common area for controlling liquid crystals. A color filter or the like for filtering light passing through an electrode and a common liquid crystal is disposed.

Referring to FIG. 1, the first light blocking layer 120 is formed in a band shape along an outer edge of the first liquid crystal display region 115 formed on the first transparent substrate 110. The first light blocking layer 120 blocks light so that the light leaked from the first liquid crystal display area 115 does not reach the eyes of the user. The first light blocking layer 120 is made of chromium (Cr), chromium oxide (CrO ₂ ), or the like, and has a low light reflectance compared to a general metal.

The first alignment mark 130 is formed on the first light blocking film 120 and is formed by opening a portion of the first light blocking film 120.

Referring to FIG. 1, the second substrate 200 includes a second transparent substrate 220 and a second liquid crystal display area 250. The second liquid crystal display area 250 has the same shape and the same area as the first display area 115. The second liquid crystal display area 250 includes a pixel electrode for controlling the liquid crystal and a thin film transistor (TFT) for applying a pixel voltage to the pixel electrode.

Referring to FIG. 3, a third alignment mark 210 that is not covered by the first light blocking layer 120 formed on the first substrate 100 is further formed on the second substrate 200.

An edge grinding facility for grinding the edge of the first substrate 100 or the second substrate 200 or a polarizer attachment facility for attaching the polarizer to the first substrate 100 and the second substrate 200 may include a first alignment mark ( 130) and the third alignment mark 210.

At this time, the edge grinding facility or the polarizer attachment facility recognizes the first alignment mark 130 or the third alignment mark 210 using a CCD camera or the like.

In this case, the light reflectance of the first alignment mark 130 photographed by the CCD camera is significantly lower than that of the first light blocking film 120, so that the edge grinding facility or the polarizer attachment device may use the first alignment mark ( 130 can be accurately recognized.

Similarly, since the light reflectance at the third alignment mark 210 photographed by the CCD camera is significantly different from the light reflectance of the second substrate 200, the edge grinding facility or the polarizer attachment facility may use the third alignment mark 210. Can accurately recognize the position of

The edge grinding facility grinds the edge of the first substrate 100 or the second substrate 200 using the first alignment mark 130 or the third alignment mark 210, and the polarization plate attachment facility is the first alignment. The polarizing plate is attached to the first substrate 100 or the second substrate 200 using the in mark 130 or the third alignment mark 210.

Referring to FIG. 2, the liquid crystal 300 is disposed between the first substrate 100 or the second substrate 200. The light transmittance of the liquid crystal 300 is changed by an electric field formed between the common electrode of the first substrate 100 and the pixel electrode of the second substrate 200.

According to this embodiment, the edge grinding facility or the polarizing plate attachment facility can accurately recognize the position of the first substrate or the second substrate, thereby preventing process defects in the edge grinding process and the polarizing plate attachment process.

Example 1

4 is a cross-sectional view showing a liquid crystal display device according to a first embodiment of the present invention.

Referring to FIG. 4, a second alignment mark 140 is further provided on a portion of the second substrate 200 facing the first light blocking layer 120.

The edge grinding facility or the polarizer attachment facility can sufficiently recognize the position of the first alignment mark 130 even with the first alignment mark 130 formed on the first light blocking film 120. However, since the first alignment mark 130 may not be recognized depending on the working environment, the first alignment mark 130 may be more accurately recognized by the CCD camera or the like in this embodiment.

The second alignment mark 140 is made of a metal material having excellent light reflectance, for example, aluminum, aluminum-neodymium alloy, etc., and the first alignment mark 130 is made of chromium or chromium oxide material having very low light reflectance. Since the light reflectance difference between the first alignment mark 130 and the second alignment mark 140 is very large.

Specifically, the light reaching the first light blocking film 120 to capture an image from a CCD camera or the like is absorbed by the first light blocking film 120. As a result, the light reaching the first light blocking layer 120 may not be incident to the CCD camera. On the other hand, the light passing through the first alignment mark 130 reaches the second alignment mark 140, and the light is reflected from the second alignment mark 140 and then incident to the CCD camera. As a result, the position of the first alignment mark 130 is more accurately recognized.

According to this embodiment, the position of the first alignment mark can be calculated more precisely through the image photographed by the CCD camera.

Example 2

5 is a plan view illustrating a liquid crystal display according to a second exemplary embodiment of the present invention. 6 is a cross-sectional view taken along the line C-C of FIG. This embodiment is the same as the first embodiment except that the planar area of the first align mark is larger than that of the second align mark.

5 or 6, a first alignment mark 130 is formed on the first light blocking layer 120 formed on the first substrate 100, and a second alignment mark is formed on the second substrate 200. 140 is formed. The edge grinding facility or the polarizer attachment facility accurately recognizes the position of the liquid crystal display using the first alignment mark 130 and the second alignment mark 140.

In this case, the planar area of the first alignment mark 130 is larger than the planar area of the second alignment mark 140. In detail, the first alignment mark 130 is formed in a quadrangular shape, and the second alignment mark 140 is formed in a cross shape smaller than the plane of the first alignment mark 130. In this case, the second alignment mark 140 is disposed at the center portion of the first alignment mark 130.

In this way, the size of the first alignment mark 130 may be larger than the second alignment mark 140 even if the second alignment mark 140 moves vertically or horizontally within the allowable range. ) Is not covered by the first light blocking film 120.

For example, the plane and shape of the first alignment mark 130 and the second alignment mark 140 are the same, and the first alignment mark 130 and the second alignment mark 140 are within the allowable range. This is because the second align mark 140 may not be recognized when it is misaligned at.

According to this embodiment, even if the first alignment mark 130 and the second alignment mark 140 are misaligned within the allowable range, the edge grinding facility or the polarizer attachment facility is the first alignment mark 130 and the second alignment mark. The alignment mark 140 may be recognized to accurately perform the edge grinding process or the polarizer attachment process.

Example 3

7 is a plan view of a liquid crystal display according to a third exemplary embodiment of the present invention. FIG. 8 is a cross-sectional view taken along the line D-D of FIG. 7. This embodiment is the same as the second embodiment except that the planar area of the first align mark is smaller than that of the second align mark.

7 or 8, a first alignment mark 130 is formed on the first light blocking layer 120 formed on the first substrate 100, and a second alignment mark (2) is formed on the second substrate 200. 140 is formed. The edge grinding facility or the polarizer attachment facility accurately recognizes the position of the liquid crystal display using the first alignment mark 130 and the second alignment mark 140.

In this case, the planar area of the first alignment mark 130 is smaller than the planar area of the second alignment mark 140. In detail, the first alignment mark 130 is formed in a cross shape, and the second alignment mark 140 is formed in a quadrangular shape larger than the plane of the first alignment mark 130. In this case, the first alignment mark 130 is disposed at the center portion of the second alignment mark 140.

As such, the planar area of the first alignment mark 130 is smaller than the second alignment mark 140 so that the first alignment mark 130 or the second alignment mark 140 is vertically or vertically or horizontally within the allowable range. This is to prevent the second alignment mark 140 from being covered by the first light blocking layer 120 even if it moves.

For example, the plane and shape of the first alignment mark 130 and the second alignment mark 140 are the same, and the first alignment mark 130 and the second alignment mark 140 are within the allowable range. This is because the second align mark 140 may not be recognized when it is misaligned at.

In addition, when the planar area of the first alignment mark 130 becomes large, light leaks through the first alignment mark 130, and thus, the image display quality is greatly degraded. It is advantageous in terms of display quality to decrease the planar area of the align mark 130 and increase the planar area of the second align mark 140.

According to this embodiment, even if the first alignment mark and the second alignment mark are misaligned within the allowable range, the edge grinding facility or the polarizer attachment device recognizes the first alignment mark and the second alignment mark and precisely edges them. It is possible to perform a grinding process or a polarizing plate attachment process.

In addition, according to the present embodiment, it is possible to greatly reduce the leakage of light from the first alignment mark by reducing the area of the first alignment mark, thereby greatly improving the display quality.

Example 4

9 is a plan view of a liquid crystal display according to a fourth embodiment of the present invention. 10 is a cross-sectional view taken along line E-E of FIG. 9.

9 or 10, the first substrate 100 and the second substrate 200 are attached to each other by the sealing member 150. At this time, the sealing member 150 is a thermosetting material that is cured by heat or an ultraviolet curable material that is cured by ultraviolet light. In addition, the sealing member 150 has a higher white light reflectance than that of the first light blocking film 120.

Meanwhile, the first alignment mark 130 is formed in a cross shape or a square shape on the first light blocking film 120, and the sealing member 150 is disposed to face the first alignment mark 130.

Accordingly, the sealing member 150 is visible from the outside through the first alignment mark 130, and the edge grinding facility or the polarizing plate attachment facility is caused by the large brightness difference between the first alignment mark 130 and the sealing member 150. The first light blocking layer 120 and the first alignment mark 130 may be more clearly recognized to identify the position of the first alignment mark 130 more precisely.

According to this embodiment, the edge grinding facility or the polarizing plate attachment facility can more accurately recognize the position of the first alignment mark through the first alignment mark and the sealing member.

As described in detail above, an alignment mark for performing an edge grinding process or a polarizing plate attaching process is formed on the light shielding film, thereby enabling an edge grinding process or a polarizing plate attaching process, and frequently during an edge grinding process or a polarizing plate attaching process. It has the effect of greatly reducing process defects that occur easily.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (10)

A first substrate including a light blocking film covering an outer portion of the first liquid crystal display area formed on the first transparent substrate, and a first alignment mark formed by removing a portion of the light blocking film; A second substrate comprising a second liquid crystal display region formed on a second transparent substrate facing the first liquid crystal display region; And And a liquid crystal disposed between the first substrate and the second substrate. The liquid crystal display of claim 1, wherein the second substrate further comprises a second alignment mark facing the first alignment mark. 3. The liquid crystal display device according to claim 2, wherein the planar area of the first align mark is larger than the planar area of the second align mark. The liquid crystal display of claim 3, wherein the second alignment mark is disposed at the center of the first alignment mark. The liquid crystal display of claim 3, wherein the first alignment mark has a quadrangular shape and the second alignment mark has a cross shape. 3. The liquid crystal display device according to claim 2, wherein the planar area of the first alignment mark is smaller than the planar area of the second alignment mark. The liquid crystal display of claim 6, wherein the second alignment mark is disposed at the center of the first alignment mark. The liquid crystal display of claim 6, wherein the first alignment mark has a cross shape, and the second alignment mark has a quadrangular shape. The liquid crystal of claim 1, wherein the first alignment mark is disposed between a sealing member sealing the first transparent substrate and the second substrate and attaching the first substrate and the second substrate to each other. Display. 2. The liquid crystal display device according to claim 1, wherein a plurality of pixel electrodes and a thin film transistor for applying a pixel voltage to the pixel electrodes are arranged in the second liquid crystal display area.