KR100859513B1 - A substrate of liquid crystal display - Google Patents

Abstract

A plurality of signal lines are formed in the screen display unit of the thin film transistor substrate for a liquid crystal display according to the present invention. Pads connected to the signal lines to receive a signal from the outside and transmit the signals to the signal lines are clustered in the pad unit. A connection portion having a curved portion is formed between the pad portion and the screen display portion to connect signal lines and pads, respectively, and a plurality of pads are clustered in the pad portion. At this time, the bent portion is formed at least two or more obtuse angles or not positioned on the same line to prevent the organic material from being concentrated in a specific portion during spin coating when forming the organic layer in the manufacturing process of the thin film transistor array substrate for the liquid crystal display device. It is.

LCD, Pad, Fan Out, Organic Film, Step, Stain

Description

Liquid crystal display substrate {A SUBSTRATE OF LIQUID CRYSTAL DISPLAY}

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

FIG. 2 is a layout view illustrating a wiring structure of a fan out part according to the first exemplary embodiment in the liquid crystal display according to the present invention.

3 is a layout view illustrating a wiring structure of a fan out part according to a second exemplary embodiment in the liquid crystal display according to the present invention;

4 is a layout view illustrating a wiring structure of a fan out part according to a third embodiment in a liquid crystal display according to the present invention;

FIG. 5 is a layout view illustrating a wiring structure of a fan out part according to a fourth exemplary embodiment in a liquid crystal display according to the present invention.

6A and 6B are plan views illustrating the wiring structure of the fan out part according to the fifth embodiment in the liquid crystal display according to the present invention;

Also.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display having a fan out portion in which a connection portion for connecting wiring and a pad is formed between the screen display portion and the pad portion.

As one of the flat panel display devices which are widely used at present, a liquid crystal display device has two substrates on which a plurality of electrodes for generating an electric field are formed, a liquid crystal layer injected between the two substrates, and is attached to the outer surface of each substrate to emit light. 2. A display device including two polarizing plates for polarizing and controlling the amount of light transmitted by rearranging liquid crystal molecules of a liquid crystal layer by applying a voltage to an electrode. This is because the arrangement of molecules changes when a voltage is applied among various properties of the liquid crystal. In a liquid crystal display device using light transmission or reflection, the liquid crystal does not emit light and thus requires a light source on its own or externally.

At this time, the display of the image by adjusting the light transmittance using a back light such as a fluorescent lamp or a cold cathode discharge tube from the liquid crystal back surface is called a transmissive liquid crystal display device, and the external light coming into the liquid crystal panel is referred to as the reflection plate of the substrate ( Displaying an image by reflecting it with a reflector is called a reflective liquid crystal display device. Since the reflective liquid crystal display device does not use a light source, it is possible to achieve low cost and low power consumption, but there is a problem that the screen becomes dark when the surroundings are dark. It is called a display device.

On the other hand, the reflection plate used in the reflective or transflective liquid crystal display device should scatter the light from the outside so that the image can be seen uniformly even at a wide viewing angle. The curved surface is formed on the organic layer formed on the lower portion of the reflection plate. It is formed to induce the reflector to have a curved surface.

However, when the organic film is formed in the manufacturing process of the thin film transistor array substrate for a liquid crystal display device, the organic film is coated by a spin method. At this time, the organic film is driven to a specific part due to the lower step. This induces a non-uniform profile of the bend when patterning the organic film to form the bend, and as a result, appears as a spot when an image is displayed.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a liquid crystal display device capable of minimizing staining caused by an organic layer.

In order to achieve the above technical problem, in the liquid crystal display according to the present invention, in order to prevent the organic film from gathering during spin coating, the connection part at the fan out part connecting the wires and the pads is grouped so that the wires are clustered from the screen display part to the pad part. The auxiliary pattern is formed in a straight line or curve shape having no straight line or having at least two bent portions, the connecting portion has a bent portion not located on the same line, or an auxiliary pattern is formed at a portion where the connecting portion is not formed at the fan out portion. .

More specifically, in the thin film transistor substrate for a liquid crystal display according to the present invention, a plurality of signal lines for transmitting an image signal or a scan signal are formed to cross each other, and the pad part receives an image signal or a scan signal from the outside. A plurality of pads, which are transmitted to the signal line and connected to the signal line, are grouped together. In addition, a fan-out portion positioned between the screen display portion and the pad portion is formed with a connection portion connecting the signal line and the pad, respectively.

At this time, some of the connecting portion may have at least two or more bent portions at obtuse angles, or the bent portions formed at the respective connecting portions may be formed so as not to have the same line, or may be formed in a straight or curved shape without the bent portion, and fan out. The part may be separated from the connection part connecting the signal line and the pad and have the same step as the connection part, and may have a stepped auxiliary pattern separated by one or at least two or a radial pattern having branches or an auxiliary pattern formed in an oblique shape. Can be.

In this case, it is preferable that the connection part is made of at least two different conductive layers.

Next, a liquid crystal display substrate according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings so that a person skilled in the art can easily carry out the present invention.

First, the structure of the liquid crystal display according to the present invention will be described with reference to FIG. 1.

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

As shown in FIG. 1, the liquid crystal display according to the exemplary embodiment of the present invention is injected between the first insulating substrate 100 and the second insulating substrate 200 facing each other and between them 100 and 200. A liquid crystal material layer (not shown).

In the second insulating substrate 200 facing the first insulating substrate 100, red, green, and blue color filters (not shown) disposed sequentially in each pixel region, and a black matrix having openings in the pixel region ( (Not shown) or a common electrode (not shown) is formed on the entire surface, also referred to as a color filter substrate.

On the other hand, the first insulating substrate 100 according to the embodiment of the present invention is formed in the horizontal direction and crosses the gate line 22 and the gate line 22 that transmit the scan signal, and defines a pixel area to define an image signal. A pixel electrode (not shown) formed of a conductive material having a transparent conductive material or reflectivity, such as an indium tin oxide (ITO) or indium zinc oxide (IZO), formed in the pixel area of the data line 62 and the matrix array to be transmitted And the gate line 22 and the data line 62 intersecting and electrically connected to the gate line 22 and the data line 62 to control an image signal transmitted to the pixel electrode according to a scan signal. A thin film transistor (not shown) is formed, which is called a thin film transistor substrate. In this case, the thin film transistor substrate 200 is formed of a set of pixel regions in which a plurality of wirings 22 and 62 intersect each other, and the screen display unit D on which an image is displayed, the gate line 22 and the data line ( 62 and a plurality of gate pads (not shown) and data pads respectively connected to the inner ends of the 62 and receiving scan signals or data signals from the outside and transmitting the scan signals or data signals to the gate lines 22 and the data lines 62, respectively. Located between the pad portion P and the pad portion P and the screen display portion D, the wirings 22 and 62 are connected to the plurality of pads, respectively, and the pads P are clustered. It consists of the fan out part O in which the connection parts 23 and 63 are formed.

Although the above has been described as including the color filter, the black matrix and the common electrode in the second insulating substrate 200, they may be selectively formed in the first insulating substrate 100.

At this time, in the method of manufacturing the thin film transistor substrate 200 according to the embodiment of the present invention, first, a gate wiring conductive material is laminated and patterned on top of an insulating substrate for a liquid crystal display device to form a gate line 22 and a gate line 22. A gate wiring including a gate electrode (not shown) of the thin film transistor connected to the gate pad and a gate pad connected to the gate line 22 through the connecting portion 23, and then forming a gate insulating film covering the gate wiring. do. Subsequently, a semiconductor layer is formed on the gate insulating layer of the gate electrode, and then a conductive material for data wiring is stacked and patterned to connect to the data line 62 and the data line 62, and the source electrode and the gate positioned on the semiconductor layer. A data line including a data electrode connected to one side of the data line 62 is formed through the drain electrode facing the source electrode and the connecting portion 63 around the electrode. Subsequently, a protective film covering the semiconductor layer exposed between the source and drain electrodes is stacked, and an organic insulating material is coated on the top thereof by a spin coating method to form an organic film. Subsequently, in order to maximize the reflection efficiency of the subsequently formed reflective film, the organic film is patterned by a photo process to form an uneven pattern on the surface of the organic film, and the organic film and the protective film are patterned in sequence to expose the drain electrode, the gate pad, and the data pad. Form a hole. Subsequently, a conductive material having reflectivity is stacked and patterned on the organic layer to form a reflective film connected to the drain electrode through the contact hole. At this time, the reflective film also has an uneven pattern along the uneven pattern of the organic film.

The manufacturing method described above relates to a method of manufacturing a thin film transistor substrate for a reflective liquid crystal display device, but in the semi-transmissive manufacturing process, a process of forming a transparent conductive film by stacking and patterning a transparent conductive material before or after forming the reflective film is added. Alternatively, an auxiliary pad may be formed to be connected to the gate pad and the data pad, respectively, through a contact hole in the same layer as the reflective film or the transparent conductive film.

In the method of manufacturing a thin film transistor substrate for a liquid crystal display according to an exemplary embodiment of the present invention, the organic layer is a spin coating method in which an organic insulating material is dropped on an upper portion of the substrate, and then the substrate is rotated to spread the organic insulating material on the entire surface of the substrate. To form. Here, when the organic insulating material spreads, due to the wiring, the organic material is attracted to a specific portion due to the step or the structure of the wiring, so that the organic film is formed thicker than other portions. As a result, when the uneven pattern is formed on the surface of the organic film, the degree of unevenness is formed differently from other parts in the thicker part than the other part, and as a result, the reflectance of the reflective film on the upper part of the thick organic film is different from the other part to display an image When it does, it appears as a stain.

According to an exemplary embodiment of the present invention, when the spin coating of an organic insulating material to form an organic film in a process of manufacturing a thin film transistor array substrate for a liquid crystal display device, the pad portion is separated from the screen display part D so as to prevent it from being concentrated to a specific part of the organic material. The connecting portions 23 and 63 connecting the wirings 22 and 62 and the pads to group the wirings 22 and 62 with (P) have no bends and are formed in a straight line or a curved shape or the connecting portions 23 and 63. Has at least two bends in the fan out part O so as to have a gentle inclination angle, or the bent parts of the connecting parts 23 and 63 connected to the respective wires are not located on the same line, or in the fan out part O. In the part where the connection parts 23 and 63 are not formed, a step assistance pattern is formed to have the same step as the wiring part, or the organic material is concentrated in a specific part. To prevent this, radial patterns or oblique auxiliary patterns are formed. This will be described in detail with reference to the drawings.

2 is a layout view illustrating a wiring structure of a fan out part according to a first exemplary embodiment in the liquid crystal display according to the present invention.

As shown in FIG. 2, in the liquid crystal display according to the exemplary embodiment of the present invention, the screen display unit D on which the wires 22 and 62 are formed and the pad unit on which the plurality of pads 24 and 68 are formed ( In the fan out part O positioned between P, the connecting parts 23 and 63 connecting the wires 22 and 62 and the pads 24 and 68 are respectively pads P and P. It is formed to be clustered in), wherein the connection portion 23 has at least two bends (A, B) having an obtuse angle. In this case, the bent portions A and B are formed more smoothly than the bent portion in which the connecting portion is bent at a right angle or an acute angle, thereby preventing the organic layer from being concentrated to a specific portion when forming the organic layer by spin coating. Then, when forming the uneven pattern on the surface of the organic film in the method of manufacturing a thin film transistor substrate for a reflective liquid crystal display device, the profile of the uneven pattern may be uniformly formed over the entire surface, thereby uniformly inducing the uneven pattern of the reflective film. This can prevent spots from appearing when displaying an image.

At this time, the dotted line (a) connecting the bent portion (A) formed in the plurality of connecting portions (23, 63) and the dotted line (b) connecting the bent portion (B) is preferably not parallel.

Next, a structure in which the bent portion of the connecting portion is not positioned on the same line will be described in detail with reference to FIG. 3.

3 is a layout view illustrating a wiring structure of a fan out part according to a second exemplary embodiment in the liquid crystal display according to the present invention.

As shown in FIG. 3, in the wiring structure of the fan out part O according to the second exemplary embodiment of the present invention, the wirings 22 and 62 of the screen display part D and the pads 24 of the pad part P are formed. The bent portions a1, a2, a3, which are the bent portions of the connecting portions 23, 63 connecting the 68, are formed not to be located on the same line. In this case, the bent portions a1, a2, and a3 are formed in a zigzag shape, and as a result, the stepped portions of the bent portions a1, a2, and a3 are irregularly arranged so that the organic layer is molten to a specific portion when forming the organic layer by spin coating. Even if it is dispersed by the step. Therefore, the same effects as in the first embodiment can be obtained.

At this time, although not shown in the drawing, if the connecting portions 23 and 63 are formed of at least two different conductive layers in the fan out portion O without forming a single layer, a space between the wirings 22 and 62 is secured. The number of bends and their angles can be secured to the connecting portions 23 and 63 at the fan out portion O, so that the straight diagonal stain occurring in the center direction is alleviated.

Next, the structure of the connecting portion having no bend will be described in detail with reference to the drawings.

4 and 5, in the wiring structure of the fan out part O according to the third and fourth embodiments of the present invention, the wirings 22 and 62 of the screen display part D and the pad part P are shown. The connecting portions 23 and 63 connecting the pads 24 and 68 of the () have no bends, unlike the first and second embodiments, and have a curved shape (231, 631, and FIG. 4) or a straight shape (232, 632). ), It is possible to prevent the organic film from being driven to a specific portion by the bent portion when the organic film is formed by spin coating. Therefore, the same effects as in the first embodiment can be obtained.

Next, a structure having a specific pattern formed in a portion where the connecting portions 23 and 63 are not formed in the fan out portion O will be described.

6A and 6B are layout views illustrating the structure of wirings of the fan out part according to the fifth embodiment in the liquid crystal display according to the present invention.

As shown in FIGS. 6A and 6B, the fan out part O according to the fifth exemplary embodiment of the present invention may include wirings 22 and 62 of the screen display part D and pads 24 and 68 of the pad part P. FIG. ), Step difference compensation patterns 300 and 300 'are formed in regions where the connection portions 23 and 63 are not formed.

In FIG. 6A, the step compensation pattern 300 is formed as a single flat pattern. In FIG. 6B, the step compensation pattern 300 ′ is divided into a plurality of steps.

The portion of the fan out portion O where the connecting portions 23 and 63 are not formed is lower than the portion where the connecting portions 23 and 63 are densely formed so that the thickness of the organic layer is uneven when coating the organic layer. The problem occurs that is formed and appear as a stain. In order to prevent this, in the fifth embodiment, as shown in FIGS. 6A and 6B, the same height as that of the connecting parts 23 and 63 is formed in a region where the connecting parts 23 and 63 are not formed in the fan out part O. The branch has a structure in which step compensation patterns 300 and 300 'are added. In this way, the height of the organic film becomes uniform at the time of coating the organic film, and it is possible to prevent the organic film from being driven to a specific part due to the step difference.

Next, a structure having an auxiliary pattern for preventing the organic material from being concentrated to a specific portion in a portion where the connecting portions 23 and 63 are not formed in the fan out portion O will be described.

7A and 7B are layout views illustrating the structure of wirings of the fan out part according to the sixth embodiment in the liquid crystal display according to the present invention.

As shown in FIGS. 7A and 7B, the fan out part O according to the sixth exemplary embodiment of the present invention may include wirings 22 and 62 of the screen display part D and pads 24 and 68 of the pad part P. FIG. ), Flow compensation patterns 400 and 400 ′ are formed in regions where the connecting portions 23 and 63 are not formed.

In this case, the flow compensation patterns 400 and 400 'of FIGS. 7A and 7B are formed in regions in which the connection parts 23 and 63 are not formed, as in the step compensation patterns 300 and 300' of the fifth embodiment. Unlike the fifth embodiment, the organic film has a function of preventing the organic film from being concentrated in a specific portion and dispersing the organic material during spin coating.

In the first to sixth embodiments described above, one or two connection unit structures are described, but at least two or more embodiments may be mixed to complete one thin film transistor substrate.

While the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated. Accordingly, the invention is limited only by the claims.

As described above, the present invention prevents the connecting portion connecting the wiring and the pad from the fan out portion of the liquid crystal display device to have no curved portion, forms the curved portion smoothly, injects a step by the curved portion, or has the same height as the connecting portion. By adding a compensation pattern or dispersing the flow of organic material, it is possible to prevent the organic film from gathering to a specific portion during spin coating. Therefore, the uneven pattern may be uniformly formed on the surface of the organic film and the uneven pattern of the reflective film formed thereon may be uniformly induced to prevent the appearance of unevenness when displaying an image, thereby improving the display characteristics of the product.

Claims (16)

delete delete delete delete delete delete delete delete delete delete delete delete delete A screen display unit which is formed by crossing a plurality of signal lines for transmitting an image signal or a scanning signal with each other, and displaying an image, A pad unit which receives the image signal or the scan signal from the outside and transmits the image signal or the scan signal to the signal line, and a plurality of pads connected to the signal line are clustered together A fan out part disposed between the screen display part and the pad part and having a connection part connecting the signal line and the pad, respectively; A flow compensator separated from the fan out part and formed on the substrate and having a plurality of radial auxiliary patterns having branches or a plurality of diagonal auxiliary patterns extending in an oblique direction with respect to the signal line; Substrate for a liquid crystal display device comprising a. The method of claim 14, And the connection portion is formed of at least two different conductive layers. The method of claim 14, The connection part includes an oblique part having at least two bent parts inclined with respect to the signal line and bent at an obtuse angle, or a curved part curved in a streamline with respect to the signal line, A substrate for a liquid crystal display device that is zigzag when the inflection points of the bent portions are connected at adjacent connection portions.

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