KR20070081033A - Display device and method of manufacturing the same - Google Patents

Abstract

A display device and a method for manufacturing the same are provided to prevent the disconnection of a data line, by forming a thickness of an organic insulating layer to be thicker in a peripheral area than in a display area so that the data line in the peripheral area is covered by the organic insulating layer. A display panel(100) is divided into a display area having pixels and a peripheral area adjacent to the display area. The display area displays an image in response to a driving signal. A driving chip is mounted on the display panel correspondingly to the peripheral area. The driving chip supplies the driving signal to the display panel. The display panel includes a base substrate(110), signal lines formed on the base substrate, and an organic insulating layer(160) formed on the base substrate to cover the signal lines. The signal lines receive the driving signal from the driving chip through a pad part formed in the peripheral area, and supplies the driving signal to the pixels. The organic insulating layer has a first thickness(ID2) in the peripheral area and a second thickness(ID1) thicker than the first thickness in the display area. The organic insulating layer has a via-hole for exposing the pad part.

Description

DISPLAY DEVICE AND METHOD OF MANUFACTURING THE SAME}

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

FIG. 2 is an enlarged plan view of a portion 'A' illustrated in FIG. 1.

3 is a cross-sectional view taken along the line II ′ of FIG. 1.

4A through 4D are cross-sectional views illustrating a manufacturing process of the liquid crystal display shown in FIG. 3.

5 is a cross-sectional view taken along the line II-II ′ of FIG. 1.

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

100: display substrate 200: driving chip

300: gate driving circuit 400: liquid crystal display device

The present invention relates to a display device and a method for manufacturing the same, and more particularly, to a display device and a method for manufacturing the same that can improve the yield of the product.

In general, a liquid crystal display device includes a liquid crystal display panel that displays an image using light. The liquid crystal display panel includes an array substrate, a color filter substrate, and a liquid crystal layer interposed between the array substrate and the color filter substrate.

A driving chip for outputting a driving signal is mounted in the peripheral area of the liquid crystal display panel, and the driving chip is electrically connected to a signal line formed on the array substrate. A pad portion electrically connected to the driving chip is formed at the end of the signal line, and the driving chip is mounted on the pad portion. The pad portion and the driving chip are electrically connected by the anisotropic conductive film. The anisotropic conductive film serves as an adhesive for fixing the driving chip to the liquid crystal display panel.

However, the array substrate is provided with an organic insulating film for protecting the signal lines. In general, the organic insulating film is formed to a thicker thickness than other films formed on the array substrate. Due to the thickness of the organic insulating layer, the adhesion between the driving chip and the liquid crystal display panel is reduced.

Therefore, conventionally, a structure for completely removing the organic insulating film formed in the peripheral region has been proposed. However, when the organic insulating layer is completely removed from the peripheral region, the signal line is exposed to the outside, thereby causing an open phenomenon due to corrosion of the signal line or an open phenomenon due to scratches generated during the process. As a result, the openness of the signal line lowers the yield of the product.

An object of the present invention is to provide a display device for improving the yield of the product by preventing the open phenomenon of the signal line.

It is also an object of the present invention to provide a method applied to manufacturing the above display device.

According to an exemplary embodiment of the present invention, a liquid crystal display (LCD) is mounted on a display panel corresponding to the display panel and a display panel divided into a display area including pixels for displaying an image in response to a driving signal, and a peripheral area adjacent to the display area. And a driving chip for providing the driving signal to the display panel.

The display panel includes a base substrate, a signal line, and an organic insulating layer. The signal line is provided on the base substrate, and receives the driving signal from the driving chip through the pad part formed in the peripheral area to provide the pixel to the pixel. The organic insulating layer is formed on the base substrate to form a via hole for covering the signal line and exposing the pad part. In addition, the organic insulating layer has a first thickness in the peripheral area, and has a second thickness thicker than the first thickness in the display area.

In the method of manufacturing a liquid crystal display according to the present invention, a signal line is formed in a display area of a base substrate, and a pad portion extending from the signal line is formed in a peripheral area adjacent to the display area. An organic insulating layer is formed on the base substrate on which the signal line is formed, the organic insulating layer having a first thickness in the peripheral region and a second thickness thicker than the first thickness in the display region. A via hole exposing the pad part is formed in the organic insulating layer. A driving chip for providing a driving signal to the pad part is mounted on the base substrate corresponding to the peripheral area.

According to such a display device and a manufacturing method thereof, disconnection of the signal line can be prevented by partially remaining the organic insulating film in the peripheral region in which the driving chip is mounted, and as a result, the yield of the product can be improved.

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

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

Referring to FIG. 1, the LCD 400 includes a display panel 100 displaying an image in response to a gate signal and a data signal, a driving chip 200 for outputting the data signal and a gate control signal, and the gate. The gate driving circuit 300 outputs the gate signal in response to a control signal.

The display panel 100 includes a base substrate 110, data lines DL electrically connected to the driving chip 200, gate lines GL electrically connected to the gate driving circuit 300, and data lines. And a thin film transistor (TFT) 120 connected to the gate line, and a pixel electrode 130 electrically connected to the TFT 120.

The base substrate 110 is a substrate made of a transparent material such as glass, quartz, sapphire, or the like through which light is transmitted. The base substrate 110 is divided into a display area DA in which the image is displayed and a peripheral area SA surrounding the display area DA. Here, the driving chip 200 and the gate driving circuit 300 are provided in the peripheral area SA.

The gate lines GL are provided on the base substrate 110. The gate lines GL extend in a first direction D1 and are disposed in a second direction D2 orthogonal to the first direction D1. The gate lines GL receive the gate signal from the gate driving circuit 300.

The data lines DL are insulated from the gate lines GL on the base substrate 110. The data lines DL extend in the second direction D2 and are disposed in the first direction D1. The data lines DL receive the data signal from the driving chip 400.

The TFT 120 is provided in the display area DA and operates as a switching element. That is, the TFT 120 is connected to the gate line and the data line to apply the data signal to the pixel electrode 130 in response to the gate signal.

The driving chip 200 may be composed of two or more chips separated into a data line chip and a gate line chip, or a single chip integrating the chips. In the present invention, the driving chip 200 provides a data signal to the data lines DL and provides the gate control signal to the gate driving circuit 300.

The gate driving circuit 300 outputs the gate signal in response to the gate driving signal from the driving chip 200, and provides the gate signal to the gate lines GL. The gate driving circuit 300 is formed together with the TFT 120 through a thin film process of forming the TFT 120. However, as another example of the present invention, the gate driving circuit 300 may be embedded in the driving chip 200 or may be formed as a separate chip and mounted in the peripheral area SA of the first substrate. When the gate driving circuit 300 is embedded in the driving chip 200, the driving chip 200 outputs the gate signal and provides the gate signal to the gate lines GL.

Although not shown, the display panel 100 further includes an upper base substrate facing the base substrate, and a liquid crystal layer is interposed between the base substrate and the upper base substrate.

FIG. 2 is an enlarged plan view of a portion 'A' illustrated in FIG. 1.

1 and 2, pad portions DL_P are provided at ends of each of the data lines DL1, DL2,..., DLN (where N is a natural number of 1 or more), and each pad portion includes the driving chip. It is electrically connected with 200.

Coupling relationships between the data lines DL1, DL2,..., DLN, and the driving chip 200 are the same. Therefore, the coupling relationship between each of the data lines DL1, DL2,..., DLN, and the driving chip 200 will be described below using the fifth to eighth data lines DL5, DL6, DL7, and DL8 as an example. It demonstrates concretely.

The fifth to eighth data lines DL5, DL6, DL7, and DL8 are sequentially arranged in the first direction D1. Here, the pad parts are located in the first column and the pad parts are located in the second column of the fifth and seventh data lines DL5 and DL7.

3 is a cross-sectional view taken along the line II ′ of FIG. 1.

2 and 3, a gate insulating layer 140 is provided on the base substrate 110, and the data lines DL are formed on the gate insulating layer 140.

A passivation layer 150 is provided in the gate insulating layer 140 on which the data lines DL are formed, and an organic insulation layer 160 is provided on the passivation layer 150.

Via holes VH exposing the pad portions DL_P of the data lines DL are formed in the passivation layer 150 and the organic insulating layer 160. Here, the distance OD1 between two adjacent via holes is about 10 μm.

An electrode unit 170 is provided on upper surfaces of the exposed pad units DL_P. The electrode unit 170 is electrically connected to the driving chip 200 to provide the data signal to each pad unit. Here, the distance OD2 between the via hole VH and the electrode unit 170 is about 2 μm.

The driving chip 200 is mounted on the organic insulating layer 160. The driving chip 200 is provided on the pad parts DL_P, and a bump 210 for outputting the data signal is provided on a rear surface of the driving chip 200.

An anisotropic conductive film 500 is interposed between the display panel 100 and the driving chip 200. The anisotropic conductive film 500 fixes the driving chip 200 to the display panel 100. The anisotropic conductive film 500 includes conductive particles and electrically connects the driving chip 200 to the pad parts DL_P.

The organic insulating layer 160 may have a thickness ID1 of the chip region CA such that the anisotropic conductive film 500 is formed in the chip region CA in which the driving chip 200 is mounted. ) Is formed thinner than the thickness ID2 of the unmounted region.

As such, the display panel 100 also forms an organic insulating layer 160 in the chip region CA on which the driving chip 200 is mounted. Accordingly, the display substrate 100 has the data at the boundary of the chip area CA due to a step between the area CA in which the driving chip 200 is mounted and the area in which the driving chip 200 is not mounted. The line can be prevented from being disconnected.

4A to 4D are cross-sectional views illustrating a manufacturing process of the liquid crystal display shown in FIG. 3.

4A and 4C, the gate insulating layer 140, the data lines DL, and the passivation layer 150 are sequentially formed on the base substrate 110.

Subsequently, the organic insulating layer 160 is deposited on the passivation layer 150, and the first mask 600 is disposed. The first mask 600 has a thickness 610 of a region corresponding to the chip region CA to be thinner than a thickness of another region, so that the light blocking rate of the region 610 corresponding to the chip region CA is different. Lower than the area.

When UV is irradiated from the upper portion of the first mask 600, a portion of the organic insulating layer 160 is removed from the chip region CA, so that the thickness of the chip region CA is greater than that of other regions. It is formed thick.

Next, the via hole VH is formed by removing the organic insulating layer 160 on the pad portions DL_P using the second mask 700. Here, the second mask 700 includes a hole 710 formed to correspond to the pad parts DL_P to transmit the ultraviolet UV.

Referring to FIG. 4D, the electrode part 170 is formed on the pad parts DL_P exposed through the via hole VH.

Subsequently, the anisotropic conductive film 500 is formed in the chip region CA of the organic insulating layer 160, and as shown in FIG. 3, the driving chip 200 is formed on the anisotropic conductive film 500. Mount it.

5 is a cross-sectional view taken along the line II-II ′ of FIG. 1.

1 and 5, the display substrate 100 includes an inspection TFT 180 electrically connected to a data line and a gate line.

The inspection TFT 180 is provided in the peripheral area SA of the base substrate 110. The inspection TFT 180 is formed in the same process as the process of forming the TFT 120 provided in the display area DA, and is simultaneously formed in the process of forming the TFT 120. The inspection TFT 180 provides an inspection signal provided from the outside to the data line and the gate line to inspect a short circuit between the data line and the gate line, and the inspector detects a defective pixel using the inspection result. .

The inspection TFT 180 may include a gate electrode 181 provided on the base substrate 110, an active layer 182 provided on the gate electrode 181, and an upper portion of the active layer 182. An ohmic contact layer 183 provided in the source and source and drain electrodes 184 and 185 provided on the ohmic contact layer 183 are provided.

The passivation layer 150 and the organic insulating layer 160 are sequentially provided on the inspection TFT 120. As such, the display substrate 100 includes an organic insulating layer 160 on the inspection TFT 180 to prevent the inspection TFT 180 from being damaged during the process of the liquid crystal display device 400. . Accordingly, the liquid crystal display device 400 may prevent electromagnetic waves from flowing through the damaged inspection TFT 180, and accurately detect a bad pixel.

According to the present invention described above, the liquid crystal display includes an organic insulating layer having a first thickness in a peripheral region in which the driving chip is mounted and a second thickness thicker than the first thickness in a display region in which an image is displayed.

Therefore, since the data line formed in the peripheral region is covered by the organic insulating film, the disconnection phenomenon of the data line can be prevented, and as a result, the yield of the product can be improved.

In addition, as the thickness of the organic insulating layer is reduced in the peripheral region, the adhesion between the anisotropic conductive film and the display panel can be improved, and as a result, the driving chip can be firmly fixed to the display panel.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

Claims (7)

A display panel divided into a display area including pixels for displaying an image in response to a driving signal and a peripheral area adjacent to the display area; And A driving chip mounted on the display panel corresponding to the peripheral area and providing the driving signal to the display panel; The display panel, A base substrate; A signal line provided on the base substrate and receiving the driving signal from the driving chip through the pad part formed in the peripheral area and providing the driving signal to the pixel; And An organic insulating layer formed on the base substrate to cover the signal line, have a first thickness in the peripheral area, a second thickness thicker than the first thickness in the display area, and have a via hole exposing the pad part; Display device comprising a. The display device of claim 1, wherein the display panel further comprises an electrode part formed on the pad part in an area where the via hole is formed. The display device of claim 2, wherein a size of the via hole is larger than a size of the pad part. The display device of claim 1, further comprising a conductive adhesive member which fixes the driving chip to the display panel and provides the driving signal from the driving chip to the pad unit. Forming a signal line in a display area of the base substrate and forming a pad portion extending from the signal line in a peripheral area adjacent to the display area; Forming an organic insulating layer on the base substrate on which the signal line is formed, the organic insulating layer having a first thickness in the peripheral region and a second thickness thicker than the first thickness in the display region; Patterning the organic insulating layer to form a via hole exposing the pad part; And And mounting a driving chip to provide a driving signal to the pad part on the base substrate corresponding to the peripheral area. The method of claim 5, wherein the forming of the organic insulating film, And partially exposing the organic insulating layer in the peripheral area using a half-tone mask. The method of claim 5, wherein prior to mounting the driving chip, And forming a conductive adhesive member on the organic insulating layer corresponding to the peripheral area while providing the driving signal from the driving chip to the pad unit while fixing the driving chip to the display panel. Method for manufacturing a display device.

Images