KR20060086019A - Liquid crystal divice - Google Patents

Abstract

The liquid crystal display according to the exemplary embodiment of the present invention includes a first insulating substrate, a plurality of gate lines and data lines insulated from and intersecting on the first insulating substrate, a plurality of thin film transistors connected to the gate lines and the data lines, and each thin film transistor. A thin film transistor array panel including a pixel electrode connected to the second insulating substrate, a second insulating substrate facing the thin film transistor array panel, a common electrode formed on the second insulating substrate, and formed on the common electrode, and having a horizontal length greater than the vertical length, An opposing display panel including a spacer having irregularities formed therein, a color filter formed on one of a liquid crystal, a first insulating substrate, or a second insulating substrate filled between the thin film transistor array panel and the opposing display panel.

Thin film transistor substrate, columnar spacer

Description

Liquid crystal display {LIQUID CRYSTAL DIVICE}

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

FIG. 2 is a cross-sectional view taken along the line II-II 'of FIG. 1.

FIG. 3 is a cross-sectional view taken along line III-III 'of FIG. 1 and illustrates only a color filter display panel.

4A-4C are top views of another embodiment of reference numeral 320 of FIG. 1.

FIG. 5 is a cross-sectional view taken along the line VV ′ of FIG. 4A.

6 is an enlarged view of the display area of FIG. 1.

7A and 7B are cross-sectional views illustrating a method of manufacturing a color filter display panel according to an exemplary embodiment of the present invention, in the order of their processes.

※ Code explanation about main part of drawing ※

110, 210: insulated substrate 121: gate line

151: semiconductor layer 171: data line

190: pixel electrode 220: light blocking member

230R, 230G, 230B: Color filter 270: Common electrode

320: column spacer

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device including a columnar spacer.

The liquid crystal display injects a liquid crystal material between the upper panel and the lower panel and applies an electric field to the liquid crystal to change the orientation of the liquid crystal to induce a change in the polarization state of light passing therethrough and to pass light through the polarizer according to the polarization state. The device displays an image by varying the amount of.

The cell gap must be maintained between the upper panel and the lower panel. An active spacer is used for this purpose. Active spacers include bead spacers and column spacers. Among these, the bead spacer is advantageous in terms of simplicity of process and ease of fabrication, but is floating in the liquid crystal display device to move together with the liquid crystal when the liquid crystal is injected. In this case, when the moving pressure and the moving distance are large, the alignment layer and the like may be bent, and thus light loss occurs.

On the contrary, since the column spacer is formed by photolithography, the column spacer may be selected and formed in a fixed shape at a required position. For this reason, column spacers are currently used rather than beads.

Column spacers have a smaller number of spacers formed per unit area than beads. This is solved by adjusting the size of the column spacer because it uses a photo etching process. However, when an external shock is applied, the electrode under the spacer is damaged because the shock is not absorbed properly compared to the bead spacer.

The present invention provides a liquid crystal display including a columnar spacer in which the lower conductive film is not damaged even by an external impact.

A liquid crystal display according to an exemplary embodiment of the present invention for achieving the above object includes a plurality of gate lines and data lines, a plurality of gate lines and data lines that are insulated and intersected on the first insulating substrate and the first insulating substrate. A thin film transistor display panel including a thin film transistor, a pixel electrode connected to each thin film transistor, a second insulating substrate facing the thin film transistor display panel, a common electrode formed on the second insulating substrate, formed on the common electrode, and having a horizontal length. Is formed on one of an opposing display panel including a spacer having an unevenness formed in an upper part of the vertical length and a liquid crystal, a first insulating substrate, or a second insulating substrate filled between the thin film transistor array panel and the opposing display panel. It includes a color filter.

It is preferable that a spacer has the unevenness | corrugation formed in the side surface here.

And it is preferable that the height of a spacer is 2-5 micrometers.

Moreover, it is preferable that the height of the unevenness | corrugation of a spacer is 30 to 80% of the highest height value of an unevenness | corrugation.                     

In addition, the spacer is preferably formed in a portion corresponding to the data line or the gate line.

Moreover, it is preferable that the length of a spacer is 5-30 micrometers.

In addition, each color filter preferably represents one of red, green, and blue.

Hereinafter, exemplary 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, area, plate, etc. is said to be "on" another part, this includes not only the other part "directly 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 thin film transistor array panel according to an exemplary embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

1 is a layout view of a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II-II 'of FIG. 1, and FIG. 3 is taken along line III-III' of FIG. 1. 4 is a plan view of another embodiment of reference numeral 320 of FIG. 1, and FIG. 5 is a cut along the line V-V ′ of FIG. 4a. 6 is a cross-sectional view illustrating an enlarged display area of FIG. 1.

1 to 3, the liquid crystal display according to the exemplary embodiment of the present invention is filled between the opposing thin film transistor array panel 100, the color filter panel 200, and the two display panels 100 and 200. The liquid crystal layer 300 is included. The liquid crystal layer is sealed by the sealing material 310. The two display panels 100 and 200 are supported by the columnar spacer 320. The liquid crystal display may include a compensation film (not shown), a polarizer (not shown), and a backlight device disposed on the front or side of the thin film transistor array panel 100. unit) (not shown) may be further included.

1, 2 and 6, the thin film transistor array panel 100 will be described in more detail. The insulating substrate 110 of the thin film transistor array panel 100 made of a transparent insulating material such as glass may be insulated from and cross over. A plurality of gate lines 121 and data lines 171 are formed. The gate line 121 transfers a scan signal and the data line 171 transfers an image signal.

The plurality of pixel areas P defined by the gate line 121 and the data line 171 together form a display area D for displaying an image of the liquid crystal display. One end of the gate line 121 and the data line 171 extends to the peripheral area beyond the display area D in order to receive an external signal. The remaining portion of the liquid crystal display except for the display area D is called a peripheral area.

Thin film transistors TFTs, which are switching elements, are formed in the plurality of pixel regions P, and the thin film transistors TFT turn on and off image signals according to scan signals.

Each TFT is connected to a pixel electrode 190 made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), and the pixel electrode 190 is a thin film transistor (TFT). Is applied to the image signal voltage. In the reflective liquid crystal display, the pixel electrode 190 may not be made of a transparent material, and in this case, the lower polarizer and the lower compensation film are also unnecessary.

Next, the color filter display panel 200 will be described in more detail with reference to FIGS. 1 to 5. The insulating substrate 210 of the color filter display panel 200 includes a light blocking member called a black matrix for preventing light leakage. (light blocking member) 220 is formed. The light blocking member 220 has a plurality of openings facing the pixel electrode 190 and having substantially the same shape as the pixel electrode 190.

The light blocking member 220 may further include a portion facing the thin film transistor and may extend only along the data line 171. The light blocking member 220 is made of an organic material including black pigment, chromium, and chromium oxide.

A plurality of color filters 230R, 230G, 230B are also formed on the substrate 210. The color filters 230R, 230G, and 230B face the pixel electrode 190 and have a band shape extending in the vertical direction, and include red (RED) 230R, green (230), and blue (BLUE) 230B. One of primary colors such as) may be displayed.

On the color filters 230R, 230G, 230B, and the light blocking member 220, a common electrode 270 made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO) is formed on the light blocking member 220. Formed. Here, an over coat (not shown) may be further included between the common electrode 270 and the color filters 230R, 230G, and 230B to planarize the substrate.

The columnar spacer 320 is formed on the common electrode 270. Here, the column spacer 320 may be formed in a range from one to three per three color filters 230R, 230G, and 230B, and the area of the substrate 110 and the column spacer 320. The number of formations may vary depending on the size of. In addition, more portions than those of the display unit may be formed in portions weak to external pressure, such as edges of the liquid crystal display. The columnar spacer 320 may be made of an organic insulating material, and is formed through a photographic process.

The columnar spacer 320 is formed to have a horizontal length L1 longer than the vertical length L2 as shown in FIGS. 4A to 4C. Thus, the columnar spacer 320 is mainly formed on the light blocking pattern 220 corresponding to the gate line 121 or the data line 171 of the lower panel 100. At this time, the length (L1) of the columnar spacer 320 is formed in a range that does not invade neighboring openings, preferably formed in the range of 5 ~ 30㎛.

The longitudinal length L2 in one columnar spacer 320 is the same as in FIG. 4A or has various values as in FIGS. 4B and 4C and is not regular, thereby forming irregularities on the side of the spacer.

In addition, as shown in FIG. 5, irregularities are formed on the surface of the columnar spacer 320, and the steps of the irregularities (H1-H2, H2-H3, H3-H4, H4-H5) and the interval between the irregularities (W1) ~ W5) has various values and may not be regular. In addition, the heights H1, H2, H3, H4, and H5 of the unevenness are preferably in the range of 2 to 5 μm in consideration of the cell gap of the liquid crystal display. At this time, the smallest height value in the unevenness of one columnar spacer 320 is preferably in the range of 30 to 80% of the largest height value. As such, when the irregularities are formed on the surface and the side of the spacer, the up and down elasticity and the lateral elasticity are better than the spacer without the irregularities, thereby absorbing the external impact better. Therefore, the deformation of the spacer 320 may be minimized to prevent the lower conductive layer 270 from being damaged in addition to the external impact being applied in the vertical direction as well as to the twisting impact.

An alignment film (not shown) is formed on the columnar spacer 320.

Next, a method of manufacturing a color filter display panel according to an exemplary embodiment of the present invention will be described with reference to FIGS. 7A and 7B and FIG. 2 described above.

7A and 7B are cross-sectional views illustrating a method of manufacturing a color filter display panel according to an exemplary embodiment of the present invention, in the order of their processes.

First, as shown in FIG. 7A, a photosensitive resin, chromium, or chromium oxide film including a black pigment is formed on the substrate 210, and then patterned to form the light blocking member 220.                     

Then, a photosensitive resin containing a green pigment is applied by a spin coating method or the like. The photosensitive resin is exposed and developed, and then hard baked to form a green filter 230G. Next, the blue and red filters 230B and 230R are formed in the same manner as the green filter 230G. These formation orders can be reversed.

The common electrode 270 is formed by depositing ITO or IZO on the substrate 210 by sputtering.

Next, as shown in FIG. 7B, the photosensitive resin is coated on the common electrode 270 and then patterned to form the columnar spacer 320. Here, the upper unevenness of the columnar spacer is formed by using an optical mask having a different exposure amount, such as a slit or a translucent film.

And an alignment film (not shown) formation process is performed on a columnar spacer.

As described above, the formation of irregularities on the side and the top of the spacer can absorb the impact applied to the spacer vertically or laterally to prevent the conductive film under the spacer from being damaged to provide a high quality liquid crystal display device. Can be.

 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.

Claims (7)

A first insulating substrate, a plurality of gate lines and data lines insulated from and intersecting on the first insulating substrate, a plurality of thin film transistors connected to the gate lines and data lines, and a pixel electrode connected to each of the thin film transistors. Thin film transistor display panel, A second insulating substrate facing the thin film transistor array panel, a common electrode formed on the second insulating substrate, and a spacer formed on the common electrode, the spacer having an unevenness formed on the common electrode and having a horizontal length greater than a vertical length. Facing display panel, A liquid crystal filled between the thin film transistor array panel and the opposite display panel; And a color filter formed on one of the first insulating substrate and the second insulating substrate. In claim 1, The spacer includes a concave-convex formed on the side. In claim 1, The height of the spacer is 2 ~ 5㎛ liquid crystal display device. In claim 1, The height of the unevenness of the spacer is a liquid crystal display device wherein the smallest height value of the unevenness is 30 to 80% of the largest height value of the unevenness. In claim 1, The spacer is formed in a portion corresponding to the data line or the gate line. In claim 5, The spacer has a length of 5 ~ 30㎛. In claim 1, Each color filter represents one of red, green, and blue.

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