KR100983501B1 - Display device - Google Patents

Abstract

Disclosed are a display device having a reduced production cost and an improved display quality of an image. In order to reduce the production cost, an insulating substrate includes a gate line, a data line insulated from the gate line, a switching element connected to the gate line and the data line, and a pixel electrode connected to the switching element, and a gate signal applied to the gate line is applied to the insulating substrate. Is applied from a first signal applying unit connected to one end of the gate line. In order to prevent the cell gap of the liquid crystal from being changed by the first signal applying unit which greatly reduces the production cost, a cell gap adjusting unit having the same height and area as the first signal applying unit is formed at the other end of the gate line. The cell gap adjusting unit and the first signal applying unit formed directly on the insulating substrate can greatly reduce the production cost and further improve the display quality of the image.

Display device, cell gap, first signal applying unit, cell gap adjusting unit

Description

Display {DISPLAY DEVICE}

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

FIG. 2 is a conceptual diagram of the display device of FIG. 1.

3 is a conceptual diagram illustrating the second substrate illustrated in FIG. 2.

4 is an enlarged view illustrating an enlarged portion A of FIG. 2.

FIG. 5 is a conceptual diagram illustrating another embodiment of the cell gap adjuster illustrated in FIG. 2.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device. More particularly, the present invention relates to a display device that significantly reduces the number of parts required to display an image, thereby reducing production cost and preventing degradation of display quality of an image generated in the process of reducing the number of parts. It is about.

In general, a liquid crystal has an electrical property in which the arrangement is changed by the intermediate physical properties of the solid and the liquid and the electric field, and the transmittance of light is changed by the changed arrangement.

The display device displays an image with liquid crystal. The display device has an advantage that the weight and volume are very small compared to other display devices having the same screen size. In addition, the display device also has the advantage that can be manufactured so that the diagonal length of the screen is only 10 inches to 1 inch.

As described above, a display device having various advantages has been rapidly developed in the direction of reducing production cost and improving image display quality.

Recently, in order to greatly reduce the production cost, efforts have been made to remove components necessary for displaying an image, for example, a driving IC, a printed circuit board, and the like.

For example, Korean Registered Patent No. 304261, "Applied by Applicant," Tape Carrier Package, Liquid Crystal Display Panel Assembly Including It, Liquid Crystal Display Apparatus Employing The Same, and Incorporation Method thereof "incorporates an externally applied image signal. Disclosed is a technology for transferring a gate driving signal to each gate line by using a liquid crystal display panel and a tape carrier package by applying a printed circuit board and converting an image signal into a gate driving signal and a data driving signal in an integrated printed circuit board. . Such a technology can significantly reduce the production cost since it is no longer necessary to use the gate printed circuit board, which is essential for the conventional display device.

Recently, a gate driving signal can be applied to each gate line without using a tape carrier package by COG (Chip On Glass) technology in which a driving IC is mounted on a liquid crystal display panel. Eliminating the use of printed circuit boards and tape carriers can further reduce production costs.

Recently, a technology of forming a gate driving signal applying unit formed of a thin film transistor together in a liquid crystal display panel has been developed in the process of manufacturing the thin film transistor formed in the liquid crystal display panel. As a result, it is not necessary to use all of the gate printed circuit board, the tape carrier package, and the separate driving IC, which are essentially used in the conventional display device, thereby further reducing the production cost.

As described above, the conventional display device has a problem in that the production cost is greatly reduced as the number of parts necessary for displaying an image is gradually reduced, while the quality of the image is also reduced.

Typically, since the gate driving signal applying unit formed directly on the liquid crystal display panel is asymmetrically formed on only one side of the liquid crystal display panel, the screen is tilted to one side.

In addition, when the gate driving signal applying unit formed directly on the liquid crystal display panel directly contacts the liquid crystal, the liquid crystal and the gate driving signal applying unit cause coupling by the liquid crystal to cause a delay of the gate driving signal. When the delay of the gate driving signal occurs, afterimages may occur on the screen or display distortion of the image may be greatly degraded due to distortion of the gate driving signal.

Recently, in order to overcome such a problem, a technique of arranging a sealing member sealing the liquid crystal injected into the liquid crystal display panel on the gate driving signal applying unit has been developed. The sealing member may cover some or all of the gate driving signal applying unit to prevent the coupling by the liquid crystal.

However, when using such a technique, the cell gap in the portion where the gate driving signal applying portion is formed and the cell gap in the portion where the gate driving signal applying portion is not formed are different from each other in the liquid crystal display panel. There is a problem that the quality is greatly degraded.

Accordingly, the present invention has been made in view of such a conventional problem, and an object of the present invention is to significantly reduce the number of parts required to display an image and to prevent display quality degradation of an image generated in the process of reducing the number of parts. Provide the device.

In order to realize the object of the present invention, the present invention is a first substrate comprising a first insulating substrate and a first electrode disposed on the first insulating substrate, a second insulating substrate facing the first insulating substrate, First wirings disposed on the second insulating substrate, a first signal applying unit disposed on the second insulating substrate and connected to the first ends of the first wirings, and a cell gap adjusting unit disposed on the second ends of the first wirings; A second wiring arranged to be insulated from the first wiring on the insulating substrate, a second signal applying unit for applying a second signal to the second wiring, a switching element connected to the first wiring and the second wiring, and a switching element A liquid crystal sealing member disposed in a closed loop shape between the second substrate including the second electrode receiving the second signal, the first substrate, and the second substrate, and disposed on the first signal applying unit and the cell gap adjusting unit; Between the first substrate and the second substrate, A display device including a liquid crystal sealed by is provided.

According to the present invention, the first signal applying portion is formed at one end of the first wiring formed on the insulating substrate, and the cell gap adjusting portion having the same height and shape as the first signal applying portion is formed at the other end of the gate line. The cell gap of the liquid crystal is prevented from being changed by the signal applying unit.

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 display device according to the present invention. FIG. 2 is a conceptual diagram of the display device of FIG. 1. 3 is a conceptual diagram illustrating the second substrate illustrated in FIG. 2. 4 is an enlarged view illustrating an enlarged portion A of FIG. 2.

Referring to FIG. 1, the display device 600 includes a first substrate 100, a second substrate 200, a liquid crystal sealing member 300, and a liquid crystal 400.

The first substrate 100 and the second substrate 200 are disposed to face each other, and the liquid crystal 400 is injected between the second substrate 200 and the first substrate 100. The liquid crystal sealing member 300 may include an edge of the second substrate 200 and the first substrate 100 so that the liquid crystal 400 injected between the second substrate 200 and the first substrate 100 does not leak to the outside. Are placed between the borders.

1 and 4, the first substrate 100 includes a first electrode 120. When the display device 600 performs a full color display, the first substrate 100 may further include a black matrix 140 to prevent light leakage between the color filter 130 and the second electrode to be described later. Can be. However, the display device operating in the IPS mode is formed on the second substrate 100 without forming the first electrode 120 on the first substrate 100.

The black matrix 140 is formed on the first insulating substrate 110 in a lattice shape. The black matrix 140 covers the second electrodes to be described later to prevent light leaked between the second electrodes from entering the eyes of the user. The black matrix 140 is formed by patterning a chromium thin film (Cr film), a chromium oxide thin film (CrO ₂ film), or a black organic thin film that blocks light.

The color filter 130 formed on the first insulating substrate 110 is formed corresponding to the position of the first electrode to be described later. The color filter 130 includes a red color filter for converting white light into a red light having a red wavelength, a green color filter for converting white light to a green light having a green wavelength, and a blue color filter for converting white light into a blue light having a blue wavelength. Is made of.

The first electrode 120 or the first wiring is formed on the first insulating substrate 110. The first electrode 120 is formed over the entire surface of the first insulating substrate 110. The first electrode 120 is made of transparent and conductive tin indium oxide or zinc indium oxide.

Referring to FIG. 3, the second substrate 200 may include a second insulating substrate 210, first wirings 220, or gate lines, first signal applying unit 230, second wirings 240, or data. Lines), a second signal applying unit 250, a switching element 260, a second electrode 270, and a cell gap adjusting unit 280.                     

As the second insulating substrate 210, a transparent glass substrate may be used. The first wires 220 are formed on the second insulating substrate 210. The first wires 220 extend in a first direction of the coordinate system shown in FIG. 3, and a plurality of first wires 220 are arranged in parallel in the second direction. When the resolution of the display device is 640 × 480, 480 first wirings 220 are arranged in parallel on the second insulating substrate 210.

The first signal applying unit 230 is connected in parallel to the first ends 220a of the first wires 220 to sequentially apply gate signals to the first wires 220. The first signal applying unit 230 is a Korean patent application No. 2001-7068 filed "Shift register, a display device and a first wiring driving method using the same", the Korean Patent Application No. 2001-48649 "shift register," Liquid crystal display device and its first wiring and data line block driving method "and Korean Patent Application No. 2002-3398" shift register, liquid crystal display device and its first wiring and data line block driving method "are described in detail. The detailed description thereof will be omitted. The first conductive pattern 235 is connected to the first signal applying unit 230. The first conductive pattern 235 is formed on the second insulating substrate 210 and transmits a driving signal applied from the outside to the first signal applying unit 230. The first conductive pattern 235 has a width and a thickness sufficient to prevent the gate driving signal from being modulated or distorted by the resistor.

Referring to FIG. 3 again, the second wires 240 are formed on the second insulating substrate 210 and are electrically insulated from the first wires 220. Each of the second wires 240 extends in a second direction perpendicular to the first direction on the second insulating substrate 210, and a plurality of wires 240 are arranged in parallel in the first direction. For example, a display device having a resolution of 640 × 480 and performing a full color display has 640 × 3 number of second wires 240.

The second signal applying unit 250 may be formed on the second insulating substrate 210 or on a printed circuit board or a flexible circuit board connected to the second insulating substrate 210. The second signal applying unit 250 is connected to each of the second wires 240 to apply a data signal to each of the second wires 240.

4 is an enlarged view illustrating an enlarged portion A of FIG. 2.

2 to 4, one switching element 260 is formed in each area surrounded by the first and second wirings 220 and 240 in a plan view.

One switching element 260 formed in each region surrounded by the first wiring 220 and the second wiring 240 includes a gate electrode 261, a channel layer 262, a source electrode 263, and a drain. The electrode part 264 is included.

The gate electrode part 261 is a portion extending in the second direction from the first wiring 220 extending in the first direction. The gate electrode part 261 extends between each second wiring 240. The channel layer 262 is insulated from the gate electrode part 261 and is disposed on an upper surface of the gate electrode part 261. The source electrode part 263 extends in the first direction from the second wiring 240 extending in the second direction. The source electrode part 263 extends between each first wiring 220. The source electrode portion 263 is in contact with each channel layer 262. The drain electrode part 264 is formed in parallel with the second direction like the source electrode part 263 and contacts each channel layer 262. At this time, the source electrode portion 263 and the drain electrode portion 264 are disposed so as not to short-circuit each other.

The switching element 260 is covered and insulated by the thin organic insulating film 266, and the organic insulating film 266 is covered by the organic insulating film 266 at the portion corresponding to the drain electrode portion 264 of the switching element 260. A contact hole 266a exposing the drain electrode portion 264 is formed. An uneven structure or groove may be formed on the top surface of the organic insulating layer 266. The thin organic insulating layer 266 increases the gap between the first wiring 220 and the second wiring 240 and the second electrode 270 to be described later, so that the second electrode 270 and the first wiring 220 are formed. And prevent electrical coupling of the second wiring 240. Accordingly, the second electrode 270 to be described later may be disposed closer to each other to further increase the brightness and the sharpness of the image.

The second electrode 270 is disposed on the top surface of the organic insulating layer 266. Each second electrode 270 is arranged in a matrix form, one for each region that is covered by the first wiring 220 and the second wiring 240 in a plan view. Each second electrode 270 is electrically contacted with the drain electrode 264 by a contact hole 266a.

The second electrode 270 may use a transparent and conductive transparent electrode 272 alone, or may be composed of a transparent electrode 272 and a reflective electrode 274 formed on the upper surface of the transparent electrode 272.

The second electrode 270 is formed of an indium tin oxide thin film (ITO) or an indium zinc oxide thin film (IZO). The reflective electrode 274 is made of an aluminum thin film and an aluminum alloy thin film having high light reflectance, and the area of the reflective electrode 274 is formed to be somewhat smaller than that of the transparent electrode 272. The reflective electrode 274 may have a light transmitting window having a mesh structure having a polygonal shape. Alternatively, the reflective electrode 274 may include one light transmitting window formed on a portion of the reflective electrode 274.

Meanwhile, the transmission length of the artificial light 410 passing through the liquid crystal 400 through the transparent electrode 272 is about half of the reflection length of the external light 420 reflected from the reflective electrode 274 and passed through the liquid crystal 400. The luminance of the external light 420 reflected by the reflective electrode 274 and the luminance of the artificial light 410 transmitted through the transparent electrode 272 are different from each other because of only a degree. In order to prevent this, a portion of the organic insulating layer 266 is removed to reflect the reflection length of the external light 420 that is reflected by the reflective electrode 274 and passes through the liquid crystal 400 and the liquid crystal 400 through the transmission electrode 272. The luminance deviation can be greatly reduced by making the transmission length of the artificial light 410 passed through the same substantially the same.

Referring to FIG. 3 again, the cell gap controller 280 is disposed at the second end 220b facing the first end 220a of each of the first wires 220. The cell gap adjusting unit 280 may not be connected to the second end 220b of the first wiring 220 or may be connected to the second end 220b. The cell gap adjusting unit 280 is formed in the same structure as the first signal applying unit 230 while the first signal applying unit 230 is formed. Alternatively, the cell gap controller 280 may be formed by simply stacking thin films forming the first signal applying unit 230 on the second end 220b of the first wiring 220. In this case, the cell gap adjusting unit 280 has the same height and the same area as the first signal applying unit 230. The second conductive pattern 285 is connected to the cell gap controller 280. The second conductive pattern 285 is formed on the second insulating substrate 210 so that a driving signal applied from the outside can be applied. In this case, when the driving signal is simultaneously applied to the cell gap adjusting unit 280 and the first signal applying unit 230, the display of the image is impossible and thus the second conductive pattern 285 connected to the cell gap adjusting unit 280 may not be used. Some are shorted. Therefore, the driving signal is normally applied only to the first signal applying unit 230.

In some cases, the first signal applying unit 230 may be damaged by an external impact, or the first signal applying unit 230 may not operate normally due to a process failure while the first signal applying unit 230 is manufactured. In this case, the cell gap adjusting unit 280 may be replaced with the first signal applying unit 230. In order to implement this, the shorted second conductive pattern 285 must be connected. In order to connect the shorted second conductive pattern 285, a repair line 285a is formed at a portion adjacent to the second conductive pattern 285. The repair line 285a is made of solder or the like, and the repair line 285a is melted by a laser beam or a soldering machine to connect the shorted portions of the second conductive pattern 285. In addition, a part of the first conductive pattern 235 connected to the first signal applying unit 230 is short-circuited.

FIG. 5 is a conceptual diagram illustrating another embodiment of the cell gap adjuster illustrated in FIG. 2.

Referring to FIG. 5, a first direction of the second insulating substrate 210 is a cell formed with the first substrate 100 illustrated in FIG. 2 by the first signal applying unit 230 and the cell gap adjusting unit 280. While the gap is constant, the cell gap may become nonuniform because there is no member to maintain the cell gap in the second direction of the second insulating substrate 210. In order to overcome this, an end portion of the cell gap adjusting unit 287 extends in a direction perpendicular to the second wiring 240, that is, in a first direction on the second insulating substrate 210.                     

Referring to FIG. 2, the liquid crystal sealing member 300 attaches the first insulating substrate 110 and the second insulating substrate 210 to each other, and between the first insulating substrate 110 and the second insulating substrate 210. Keep the cell gap constant. The liquid crystal sealing member 300 includes a paste having a fluidity and adhesiveness and a beads spacer 310 mixed with the paste. The liquid crystal sealing member 300 is formed in a band shape along the edges of the first insulating substrate 110 and the second insulating substrate 210. The liquid crystal sealing member 300 has a closed loop shape.

The liquid crystal sealing member 300 is disposed to pass through the upper surfaces of the first signal applying unit 230 and the cell gap adjusting unit 280 formed on the second insulating substrate 210. When the liquid crystal sealing member 300 does not pass through the upper surface of the first signal applying unit 230, the first signal applying unit 230 and the liquid crystal 400 may be electrically coupled to the first signal applying unit 230. A delay of the drive signal outputted from the < RTI ID = 0.0 > 1) < / RTI >

On the contrary, when the liquid crystal sealing member 300 does not pass through the cell gap adjusting unit 280, electrical coupling in the first signal applying unit 230 does not occur, but the first signal applying unit 230 and The first cell gap G1 formed by the first substrate 100 and the cell gap adjuster 280 and the second cell gap G2 formed by the first substrate 100 are different from each other. When the first cell gap G1 and the second cell gap G2 are different from each other, the image quality of the liquid crystal display panel becomes uneven overall.

For this reason, the liquid crystal sealing member 300 passes through the first signal applying unit 230 and the cell gap adjusting unit 280.                     

The liquid crystal 400 is disposed in a space surrounded by the first insulating substrate 110, the second insulating substrate 210, and the liquid crystal sealing member 300. The liquid crystal 400 is disposed between the first insulating substrate 110, the second insulating substrate 210, and the liquid crystal sealing member 300 by a dropping method or a vacuum injection method.

As described in detail above, the number of parts required to display an image from the display device is greatly reduced, and the cell gap of the liquid crystal is prevented from being different from each other in the process of reducing the number of parts, thereby greatly reducing the production cost of the display device. The display quality of the image generated from the display device is greatly improved.

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 (8)

A first substrate having a first insulating substrate; A second insulating substrate facing the first insulating substrate, a first wiring disposed on the second insulating substrate, a first signal applying unit disposed on the second insulating substrate and connected to a first end of the first wiring; A cell gap adjusting part disposed at a second end of the first wiring, a second wiring arranged to be insulated from the first wiring on the second insulating substrate, and a second signal applying a second signal to the second wiring A second substrate including a switching element connected to the first wiring and the second wiring and an electrode connected to the switching element to receive a second signal; A sealing member disposed between the first substrate and the second substrate in a closed loop shape and disposed on the first signal applying unit and the cell gap adjusting unit; And A liquid crystal sealed by the sealing member between the first substrate and the second substrate, An end portion of the cell gap adjusting part extends in a direction perpendicular to the extending direction of the second wiring along the surface of the second insulating substrate. A first conductive pattern connected to the first signal applying unit is formed on the second insulating substrate, and a second conductive pattern connected to the cell gap holding part and partially disconnected is formed on the second insulating substrate. And a repair line formed on the second insulating substrate to connect the disconnected second conductive pattern. The display device of claim 1, wherein a first cell gap between the cell gap adjusting part and the first substrate is substantially the same as a second gap between the first signal applying part and the first substrate. The display device of claim 1, wherein the sealing member comprises a flowable sealant and a bead spacer included in the flowable sealant. delete The display device of claim 1, wherein the cell gap adjusting part has the same structure as the first signal applying part and is electrically connected to the second end of the first wiring. delete delete The display device of claim 1, wherein the cell gap controller comprises at least one thin film among the thin films forming the first signal applying unit.

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