KR20050006405A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display is provided to prevent electric coupling of a driving signal applying unit and liquid crystal, and prevent damage of the driving signal applying unit due to a sealing member by separating the driving signal applying unit from air and liquid crystal, thereby preventing lowering of quality of an image. CONSTITUTION: A first substrate(100) includes a first display area(110) for displaying an image, a first peripheral area(120) covering the first display area, and a driving signal applying unit arranged at the first peripheral area for applying a gray scale voltage to the first display area. A second substrate(200) includes a second display area(210) opposite to the first display area and receiving a reference voltage for display the image, and a second peripheral area(220) covering the second display area. A sealing member(300) hermetically seals the first display area and the driving signal applying unit. A separation member(400) is arranged between the first display area and the driving signal applying unit for separating the first display area and the driving signal applying unit. A liquid crystal layer(500) is arranged between the first display area and the second display area.

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 display device in which the number of parts is greatly reduced and driving characteristics are improved to further improve display quality of images.

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 liquid crystal display displays an image with liquid crystal. The liquid crystal 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 liquid crystal display device also has the advantage that can be manufactured so that the diagonal length of the screen is only 1 inch to 10 inches.

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 used inevitably for the conventional liquid crystal display.

Recently, gate driving signals 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 both gate printed circuit boards and tape carrier packages can further reduce production costs.

Recently, a technology of forming a gate driving signal applying unit made of a thin film transistor has been developed during a process of manufacturing a thin film transistor formed on a liquid crystal display panel. This eliminates the need to use all of the gate printed circuit boards, tape carrier packages, and driver ICs, which are essentially used in liquid crystal displays, thereby further reducing production costs.

As described above, the conventional liquid crystal display device has an advantage 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 deteriorated.

In particular, when the gate driving signal applying unit is integrally formed on the liquid crystal display panel and the liquid crystal is disposed on the gate driving signal applying unit, the gate driving signal applying unit causes electrical coupling with the liquid crystal, thereby causing distortion or modulation of the gate driving signal. The quality of the image is greatly degraded.

In addition, in order to prevent this, a technique of covering the gate driving signal applying unit with the sealing member and preventing the coupling of the gate driving signal applying unit and the liquid crystal has been developed. According to this technique, the gate driving signal applying unit is pressed by the sealing member. The gate driving signal applying unit is frequently damaged.

Accordingly, the present invention has been made in view of such a conventional problem, and an object of the present invention is to prevent coupling between the driving signal applying unit and the liquid crystal formed in the liquid crystal display panel and to prevent the driving signal applying unit from being broken by the sealing member. The present invention provides a liquid crystal display device that significantly reduces the number of parts forming a panel and at the same time improves the display quality of an image.

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

FIG. 2 is a conceptual diagram illustrating the first substrate of FIG. 1.

3 is a conceptual diagram illustrating the sealing member and the isolation member according to the first embodiment of the present invention.

4 is a cross-sectional view taken along the line A-A of FIG. 3.

5 is a conceptual diagram of a liquid crystal display according to a second embodiment of the present invention.

6 is a conceptual diagram illustrating that the isolation member of FIG. 5 is formed on a first substrate.

7 is a conceptual diagram illustrating that the isolation member of FIG. 5 is formed on a second substrate.

8 is a conceptual diagram of a liquid crystal display according to a third embodiment of the present invention.

9 is a conceptual diagram illustrating that the isolation member of FIG. 8 is formed on a first substrate.

FIG. 10 is a conceptual diagram illustrating that the isolation member of FIG. 8 is formed on a second substrate.

In order to realize the object of the present invention, the present invention is provided with a first display area for displaying an image, a first peripheral area surrounding the first display area, and a first peripheral area disposed in the first peripheral area so as to provide a gray voltage to the first display area. A first substrate including a driving signal applying unit to be applied, a second display area to which the reference voltage is applied over the entire area to display an image facing the first display area, and a second peripheral area surrounding the second display area; A sealing member enclosing and sealing the second substrate, the first display area and the driving signal applying unit, an isolation member for isolating the first display area and the driving signal applying unit, and is disposed between the first display area and the driving signal applying unit. A liquid crystal display device including a liquid crystal disposed between a display area and a second display area is provided.

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

Example 1

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

Referring to FIG. 1, the liquid crystal display device 700 includes a first substrate 100, a second substrate 200, a sealing member 300, an isolation member 400, and a liquid crystal layer 500.

FIG. 2 is a conceptual diagram illustrating the first substrate of FIG. 1.

Referring to FIG. 2, the first substrate 100 includes a first display area 110, a first peripheral area 120, and a driving signal applying unit 130.

The first display area 110 is an area where an image is displayed, and the first peripheral area 120 is an area surrounding the first display area 110. The driving signal applying unit 130 is disposed in the first peripheral area 120 to apply the gray level signal to the first display area 110.

Referring back to FIG. 2, the driving signal applying unit 130 includes a gate driving signal applying unit 132 and a data driving signal applying unit 134. In this embodiment, the gate driving signal applying unit 132 outputs a timing signal. The data driving signal applying unit 134 may be disposed in the first peripheral region 120 or may be disposed outside the first substrate 100. In the present exemplary embodiment, the data driving signal applying unit 134 is disposed on the first peripheral region 120 and outputs a data signal.

The construction and operation of the gate driving signal applying unit 132 and the data driving signal applying unit 134 are described in Korean Patent Application No. 2001-7068 filed by the present applicant, "Shift register, display device and first wiring driving method using the same", Korean Patent Application No. 2001-48649 "Shift Register, Liquid Crystal Display Using It and First Method for Driving Wiring and Data Line Block" and Korean Patent Application No. 2002-3398 "Shift Register, Liquid Crystal Display Using Same 1 wiring and data line block driving method thereof, and a detailed description thereof will be omitted.

The first display area 110 includes first wirings 140, second wirings 150, a switching element 160, and first electrodes 170.

The first wires 140 are arranged parallel to each other in the first direction of the coordinate system shown in FIG. 2. One end of each of the first wires 140 is connected to the gate driving signal applying unit 132. The first wirings 140 are formed of the n-th first wiring from the first first wiring. For example, in the liquid crystal display having a resolution of 1024 × 768, the number of first wirings 140 is 768.

The gate driving signal applying unit 132 sequentially applies a timing signal from the first first wiring to the nth (768th) first wiring. In this case, the timing signal has a voltage level higher than or equal to a threshold voltage (Vth) sufficient to change the amorphous silicon thin film or polysilicon thin film, which is a semiconductor, from a nonconductor to a conductor.

The second wires 150 are insulated from the first wires 140 and are formed in a second direction perpendicular to the first direction. One end of each of the second wires 150 is connected to the data driving signal applying unit 134. The second wirings 150 are formed of the m-th second wiring from the first second wiring. For example, in the liquid crystal display having a resolution of 1024 × 768, the number of second wirings 150 is 1024 × 3.

The data driving signal applying unit 134 sequentially applies a gradation voltage for displaying a color image from the first second wiring to the mth (1024 × 3) second wiring.

The switching element 160 is formed at each portion where the first wires 140 and the second wires 150 cross each other. The switching element 160 includes a gate electrode G, a channel layer C, a source electrode S, and a drain electrode D.

The gate electrode G of each switching element 160 is connected to the first wirings 140. For example, in a liquid crystal display having a resolution of 1024 × 768, 1024 × 3 switching elements 160 are arranged in parallel on each first wiring 140, and gate electrodes of 1024 × 3 switching elements 160 are arranged in parallel. (G) is commonly connected to the first wires 140.

The channel layer C is disposed on the top surface of the gate electrode G of each switching element 160. The channel layer C and the gate electrode G are insulated by an insulating layer (not shown). An amorphous silicon thin film that can be formed at a process temperature lower than the melting point of the first substrate 100 is mainly used as the channel layer C. An amorphous silicon thin film and a high concentration of ion implanted on the upper surface of the amorphous silicon thin film are used. An amorphous silicon thin film (n ⁺ amophous silicon film) is used.

The source electrode S of each switching element 160 is connected to the second wirings 150. For example, in the liquid crystal display device having a resolution of 1024 × 768, 768 switching elements 160 are arranged in parallel to the second lines 150. One end of the source electrode S of the 768 switching elements 160 is commonly connected to the first wires 140, and the other end of the source electrode S is disposed on the channel layer C.

One end of the drain electrode D of each switching element 160 is connected to the channel layer C, and the other end thereof is connected to the first electrode 170 to be described later. In this case, the drain electrode D and the source electrode S are disposed so as not to short-circuit on the channel layer C.

One first electrode 170 is disposed in each region formed by crossing the first wirings 140 and the second wirings 150, and is connected to the drain electrode D of each switching element 160. In this embodiment, the first electrode 170 is made of indium tin oxide (ITO) or indium zinc oxide (IZO), which has a light transmittance comparable to that of glass and has an electrical resistance similar to that of metal. Is done.

Referring back to FIG. 1, the second substrate 200 includes a second display area 210 and a second peripheral area 220. The second display area 210 formed on the second substrate 200 faces the first display area 110, and the second peripheral area 220 surrounds the second display area 210. In the present embodiment, the second peripheral region 220 may be disposed to face the first peripheral region 120.

The second electrode 230 is disposed on the second substrate 200 over the entire area. The second electrode 230 faces the first electrode 170 and is applied with a reference voltage having a constant level. In this embodiment, the second electrode 230 is made of indium tin oxide (ITO) or indium zinc oxide (IZO) having a light transmittance comparable to that of glass and having an electrical resistance similar to that of metal. . In this embodiment, the reference voltage is applied from the outside of the first substrate 100 to the first peripheral region 120 of the first substrate 100, and the first peripheral region 120 and the second peripheral region 220. Is applied to the second peripheral region 220 of the second substrate 200 through a conductive paste (not shown) that electrically connects to the second display region 210.

3 is a conceptual diagram illustrating the sealing member and the isolation member according to the first embodiment of the present invention. 4 is a cross-sectional view taken along the line A-A of FIG. 3.

3 and 4, the sealing member 300 is preferably interposed between the first substrate 100 and the second substrate 200. The sealing member 300 prevents the liquid crystal 500 disposed between the first substrate 100 and the second substrate 200 from leaking to the outside. The sealing member 300 keeps the cell gap between the first substrate 100 and the second substrate 200 constant. Therefore, in the present embodiment, the sealing member 300 has fluidity and adhesiveness and is disposed between the first substrate 100 and the second substrate 200 in a band shape.

In the present exemplary embodiment, the sealing member 300 has a closed loop shape surrounding the gate driving signal applying unit 132 of the driving signal applying unit 130 disposed in the first display area 110 and the first peripheral area 120. Has In this case, the sealing member 300 surrounds the gate driving signal applying unit 132 to prevent the metal thin film pattern included in the gate driving signal applying unit 132 from being oxidized by external air. In this case, it is also preferable to cover the upper surface of the gate driving signal applying unit 132 with the sealing member 300. However, when the gate driving signal applying unit 132 is covered with the sealing member 300, the gate driving signal applying unit 132 is used. ), The sealing member 300 and the second electrode may form capacitance to generate capacitance coupling. In addition, when the gate driving signal applying unit 132 is covered by the sealing member 300, a large pressure is applied to the gate driving signal applying unit 132 while the sealing member 300 is cured, so that the gate driving signal applying unit ( 132 may be broken.

For this reason, the sealing member 300 has a closed loop shape including the gate driving signal applying unit 132 and the first display area 110.

However, when the gate driving signal applying unit 132 and the first display area 110 are covered by the sealing member 300, a liquid crystal, which will be described later, is disposed on the upper surface of the gate driving signal applying unit 132 and has a very high dielectric constant. Capacitance coupling is generated by the liquid crystal, which causes distortion or modulation of the timing signal output from the gate driving signal applying unit 132.

The isolation member 400 prevents the liquid crystal from being disposed on the upper surface of the gate driving signal applying unit 132 to prevent distortion or modulation of the timing signal output from the gate driving signal applying unit 132.

In order to prevent the liquid crystal from being disposed on the upper surface of the gate driving signal applying unit 132, the isolation member 400 is disposed between the first display area 110 and the gate driving signal applying unit 132. Of course, both ends of the isolation member 400 are connected to the sealing member 300. In the present embodiment, the isolation member 400 is made of a material having the same composition as the sealing member 300. The isolation member 400 has fluidity and adhesion.

Therefore, an isolation space 410 is formed between the sealing member 300 and the isolation member 400. The isolation space 410 is isolated from the air outside the liquid crystal display and the liquid crystal inside the liquid crystal display, so that the gate driving signal applying unit 132 is oxidized by air or capacitance coupling occurs by the liquid crystal. It can prevent.

According to the present exemplary embodiment, the driving signal applying unit disposed on the liquid crystal display panel is isolated from the air and the liquid crystal, thereby preventing performance degradation due to oxidation of the driving signal applying unit and preventing electrical coupling by the driving signal applying unit and the liquid crystal. It has the advantage of preventing the deterioration of the generated image quality.

Example 2

5 is a conceptual diagram of a liquid crystal display according to a second embodiment of the present invention. The liquid crystal display device according to the second embodiment of the present invention is the same as the liquid crystal display device of the first embodiment except for the structure of the isolation member of the first embodiment. Therefore, the same members are denoted by the same reference numerals as those in the first embodiment, and duplicated descriptions thereof will be omitted.

Referring to FIG. 5, the isolation member 420 is a photosensitive pattern formed by patterning a photosensitive film made of a photosensitive material. The isolation member 420 is disposed between the first display area 110 and the gate driving signal applying unit 132, and both ends thereof are disposed in the sealing member 300 to isolate the gate driving signal applying unit 132. To provide an isolation space 430. In this case, the photoresist film disposed inside the first display area 110 among the photoresists constituting the isolation member 420 is patterned, and the column spacer 435 is disposed inside the first display area 110. The pillar spacer 435 is preferably disposed between the first electrodes 170 shown in FIG. 2.

6 is a conceptual diagram illustrating that the isolation member of FIG. 5 is formed on a first substrate.

Referring to FIG. 6, the isolation member 420 is formed on the first substrate 100. The isolation member 420 formed by the patterned photoresist layer has a bottom surface disposed between the first display area 110 and the gate driving signal applying unit 132 to provide an isolation space 430. The patterned photoresist film provides a pillar spacer 435 disposed between the first electrodes 170 in the first display area 110.

7 is a conceptual diagram illustrating that the isolation member of FIG. 5 is formed on a second substrate.

Referring to FIG. 7, an isolation member 420a is formed on the second substrate 200. The isolation member 420a formed by the patterned photoresist layer has a bottom surface disposed between the second display area 210 and the gate driving signal applying unit 132 to provide the isolation space 430a. On the other hand, the patterned photoresist provides a pillar spacer 435a which is disposed between the first electrodes 170 in the second display area 210.

According to this embodiment, the isolation member can be formed by patterning a photosensitive film made of a photosensitive material. While forming the isolation member, a pillar spacer can be formed inside the first display area or the second display area, thereby greatly shortening the time required for the manufacturing process, and a sealing member that may occur in the process of forming the sealing member (). It is possible to greatly reduce the sealing member formation failure due to the spread of.

Example 3

8 is a conceptual diagram of a liquid crystal display according to a third embodiment of the present invention. 9 is a conceptual diagram illustrating that the isolation member of FIG. 8 is formed on a first substrate. FIG. 10 is a conceptual diagram illustrating that the isolation member of FIG. 8 is formed on a second substrate. The liquid crystal display device according to the third embodiment of the present invention is the same as the liquid crystal display device of the first embodiment except for the structure of the isolation member of the first embodiment. Therefore, the same members are denoted by the same reference numerals as those in the first embodiment, and duplicated descriptions thereof will be omitted.

8 to 10, the isolation member 440 is a color filter pattern formed by patterning a color filter thin film made of a color filter material. 9, the isolation member 440 includes a red color filter pattern 442, a green color filter pattern 444, and a blue color filter pattern 446. In this embodiment, the isolation member 440 is formed by overlapping the overlapped red color filter pattern 442, green color filter pattern 444, and blue color filter pattern 446. The isolation member 440 formed by overlapping the red color filter pattern 442, the green color filter pattern 444, and the blue color filter pattern 446 may be formed in the first display area 110 and the gate driving signal applying unit 132. It is disposed across the gap, both ends of the isolation member 440 is disposed in the sealing member 300 to provide an isolation space 435 to isolate the gate driving signal applying unit 132.

9, the isolation member 440 is formed on the first substrate 100. The isolation member 440 formed by overlapping the patterned color filter thin films is disposed between the first display area 110 and the gate driving signal applying unit 132 to provide an isolation space 435. The patterned color filter thin film is disposed on each top surface of the first electrodes 170 in the first display area 110 to provide a red color filter 442a, a green color filter 444a, and a blue color filter 446a. do. As described above, the first wire 140 or the second line shown in FIG. 2 is formed by the red color filter 442a, the green color filter 444a, and the blue color filter 446a disposed on each upper surface of the first electrodes 170. The spacing between the wiring 150 and the first electrode 170 can be greatly increased, so that the capacitance between the first wiring 140, the first electrode 170, the second wiring 150, and the first electrode 170 is increased. Coupling may be prevented, thus increasing the area of the first electrode 170. As a result, display quality and luminance of an image of the liquid crystal display may be further improved.

Referring to FIG. 10, the isolation member 440 is formed on the second substrate 200. In the isolation member 440 formed by overlapping the patterned color filter patterns, the bottom surface is disposed between the second display area 210 and the gate driving signal applying unit 132 to provide the isolation space 435. The isolation member 440 is disposed inside the second display area 210 to provide a red color filter 442a, a green color filter 444a, and a blue color filter 446a.

According to this embodiment, the isolation member is formed by patterning the color filter thin films made of the color filter material to overlap each other. While forming an isolation member formed by overlapping the color filter patterns with each other, a color filter can be formed inside the first display area or the second display area, which greatly shortens the manufacturing process time and can occur in the process of forming the sealing member. It is possible to greatly reduce the sealing member formation failure due to the spread of the sealing member.

As described above in detail, the driving signal applying unit formed on the first substrate constituting the liquid crystal display panel is isolated by the sealing member and the isolation member so that the external air or the liquid crystal and the driving signal applying unit do not overlap each other. It is possible to further improve the quality of, and further shorten the process required for manufacturing.

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 (11)

A first substrate comprising a first display area for displaying an image, a first peripheral area surrounding the first display area, and a driving signal applying unit disposed in the first peripheral area to apply a gray voltage to the first display area. ; A second substrate including a second display area to which the reference voltage is applied across the entire surface facing the first display area, and a second peripheral area surrounding the second display area; A sealing member enclosing and sealing the first display area and the driving signal applying unit; An isolation member disposed between the first display area and the driving signal applying unit to isolate the first display area and the driving signal applying unit; And And a liquid crystal disposed between the first display area and the second display area. The liquid crystal display of claim 1, wherein the driving signal applying unit comprises a gate driving signal applying unit for outputting a timing signal to output the first driving signal, and a data driving signal applying unit for outputting a gray level signal. 3. The display device of claim 2, wherein the first display area includes first electrodes arranged in a matrix shape, a switching device connected to the first electrodes, the gate driving signal applying unit, and a first wiring connecting the switching device; And a second wiring connecting the data driving signal applying unit and the switching element. The liquid crystal display of claim 3, wherein a second electrode facing the first electrodes is disposed in the second display area. The liquid crystal display device according to claim 1, wherein the sealing member and the isolation member are made of a strip-shaped fluid paste having fluidity and adhesion. The liquid crystal display of claim 1, wherein the sealing member is formed of a strip-shaped fluid paste interposed between the first substrate and the second substrate, and the isolation member is a photosensitive film pattern formed by patterning the photosensitive film. Device. 7. The liquid crystal display of claim 6, wherein the isolation member is formed in the second peripheral region. 7. The liquid crystal display of claim 6, wherein the isolation member is formed in the first peripheral region. 7. The liquid crystal display device according to claim 6, wherein a pillar spacer formed by patterning the photosensitive film is disposed in the first display area. The method of claim 1, wherein the sealing member is formed of a strip-shaped fluid paste having fluidity and adhesiveness, and the isolation member is an overlapping color filter pattern for forming a color filter in the second display area. Liquid crystal display device. The method of claim 1, wherein the sealing member is formed of a strip-shaped fluid paste having fluidity and adhesion, and the isolation member is an overlapping color filter pattern for forming a color filter in the first display area. Liquid crystal display device.