KR20050064886A - Liquid crystal display device - Google Patents

Abstract

The present invention discloses a liquid crystal display device in which the image quality is improved by removing the noise component generated from the lamp in the module of the liquid crystal display device through the ground terminal of the FPC so as not to remain in the lower cover and the upper case. Disclosed is a liquid crystal display module comprising a liquid crystal panel, a backlight assembly, a main frame and a lower cover and upper cases, a gate drive IC, and a data drive IC, wherein the gate drive is mounted on a pad region of the liquid crystal panel. The ground signal line of the FPC and the lower cover or the upper case which apply the driving signal and the data signal to the IC and the data drive IC are grounded to remove the noise signal.

Here, the lower cover and the upper case is a conductive metal, and the ground signal line of the FPC further includes a ground portion made of metal to facilitate contact with the lower cover, and a part of the ground signal line of the FPC is made of poly. The mid film is removed and exposed to the outside.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of removing noise generated by driving of a lamp by grounding the FPC ground terminal of the liquid crystal display device to the lower cover and the upper case. .

Recently, due to the rapid development of technology in the semiconductor industry, liquid crystal display devices are being manufactured with smaller and lighter weight and more powerful products. Cathode ray tube (CRT), which is widely used in information display devices, has many advantages in terms of performance and price, but has many disadvantages in terms of miniaturization or portability.

On the other hand, liquid crystal displays have been attracting attention as an alternative means of overcoming the shortcomings of CRTs because they have advantages such as miniaturization, light weight, and low power consumption. Currently, almost all information processing devices that require display devices are required. The situation is attached to.

Such liquid crystal displays generally apply voltages to specific molecular arrays of liquid crystals to convert them into other molecular arrays, and change optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of liquid crystal cells that emit light by such molecular arrays. Is a display device using modulation of light by a liquid crystal cell by converting the light into a visual change.

Recently, various structures have been developed for slimming and lightening in order to secure the competitiveness of the product. One of them stacks and combines the backlight assemblies, which are optical units, on the liquid crystal display panel in which the array substrate and the color filter substrate are bonded together, and inserts them into the main frame to protect them. A display mold frame structure is fabricated.

The PCB for applying a signal to the gate pad and the data pad formed at the edge of the display panel is connected with the flexible cable by TCP to which the drive IC is bonded, and is attached to the rear surface of the main frame of the liquid crystal display.

1 is a perspective view illustrating an assembly structure of a liquid crystal display according to the related art.

As shown in FIG. 1, the backlight assembly is connected to a liquid crystal panel 5 in which an array substrate having a plurality of pixels in a matrix form and a color filter substrate in which R, G, and B color filters are formed in a matrix form are bonded together. It is stacked and stored in the main frame.

A gate printed circuit board (PCB) 7 for applying a driving signal is provided at one edge of the liquid crystal panel 5 with a gate pad of the liquid crystal panel 5 interposed between the gate pad and a gated taper package (TCP). It is connected by a (flexible cable).

Similarly, a data printed circuit board (PCB) 9 for applying a graphic signal to the other edge of the liquid crystal panel 5 is connected to a data pad of the liquid crystal display panel 5 by a flexible cable. Data TCP is attached to apply a signal to the liquid crystal panel 5 according to a certain scanning method.

Under the liquid crystal panel 5, a plurality of optical sheets 11 and a lamp 13 for generating light for expressing an image, and light generated from the lamp 13 is a plane light of the area of the liquid crystal panel 5. The backlight assembly 10 including the light guide plate 15 to be replaced with the light reflection plate 17 for reflecting the light leaked from the light guide plate 15 and increasing the light efficiency is attached in a stacked form.

The backlight assembly 10 and the liquid crystal panel 5 are inserted in a stacked form on the main frame 21 for optical alignment while protecting from external shock. In order to prevent movement of the liquid crystal panel 5, a guide panel 3 capable of fixing the liquid crystal panel 5 is attached.

The main frame 21 is divided into a metal material or a plastic material, and the liquid crystal panel 5 and the backlight assembly 10 are inserted into the main frame 21 in a stacked form, and then the panel The guide 3 is coupled to the main frame 21.

Thereafter, an upper case 1 and a lower cover 22 are assembled to the liquid crystal panel 5 and the main frame 21 in which the backlight assembly 10 is accommodated.

The upper case 1 and the lower cover 22 serve to ground the PCB connected to the liquid crystal display panel while protecting the liquid crystal display panel and the backlight assembly.

The liquid crystal display device described above is a liquid crystal display device using a TCP method, but recently, a chip on glass (COG) structure in which an input / output signal line for mounting a gate dry IC and a data drive IC is mounted on a pad space of an array substrate. Liquid crystal display devices have been developed.

2 is a view showing an FPC connection structure of a COG liquid crystal display according to the prior art.

As shown in FIG. 2, the chip on glass liquid crystal panel 5 mounts a gate drive IC and a data drive IC mounted on the gate TCP and the data TCP in FIG. 1 in the pad region of the substrate. The input / output signal lines are formed outside the gate pad and the data pad in the pad region of the array substrate so as to be possible.

Accordingly, in the COG liquid crystal panel 5, drive ICs are mounted in a pad region of a substrate, and an FPC 30 terminal is connected to the input / output signal line to apply a direct drive signal and a data signal to a drive IC mounted on a substrate. do.

That is, when a drive IC is mounted and a driving signal or a data signal is applied through the FPC 30 connected to the input / output signal lines, the input / output signal lines are respectively gate pads through the drive IC mounted on the pad area. And a signal to the data pads.

Therefore, in the structure of the liquid crystal module, in FIG. 1, the PCBs connected to the gate TCP and the data TCP are folded and attached to the bottom of the lower cover 22, but the COG liquid crystal panel 5 only directly applies driving signals and data signals. Since the system is connected by the FPC 30, only the FPC 30 is folded and attached to the bottom of the lower cover 22.

Although not shown, 21 in the drawing represents a main frame.

However, in the COG liquid crystal display according to the related art, noise components generated in a lamp are transmitted to the lower cover and the upper case, and since the PCB is not present on the bottom cover and only the FPC exists, it is difficult to remove the noise. have.

Accordingly, noise components present in the upper case and the lower cover exist in the upper case and the lower cover even when the LCD is driven, thereby degrading image quality characteristics.

The present invention provides a noise generated from a lamp by grounding the lower cover and the upper cover by contacting the lower cover and the upper cover of the FPC, which is folded to the bottom of the lower cover in the chip on glass liquid crystal display and applies a driving signal. It is an object of the present invention to provide a liquid crystal display device capable of improving image quality by removing signals.

In order to achieve the above object, the liquid crystal display device according to the present invention,

A liquid crystal display module comprising a liquid crystal panel, a backlight assembly, a main frame and a lower cover and upper cases, a gate drive IC and a data drive IC,

The ground signal line of the FPC for applying driving signals and data signals to the gate drive IC and the data drive IC mounted on the pad area of the liquid crystal panel and the lower cover or the upper case are grounded to remove noise signals. do.

Here, the lower cover and the upper case is a conductive metal, and the ground signal line of the FPC further includes a ground portion made of metal to facilitate contact with the lower cover, and a part of the ground signal line of the FPC is made of poly. The mid film is removed and exposed to the outside.

The ground signal line of the FPC and the lower cover are electrically contacted by soldering or tape, and the structure of the liquid crystal display is a chip on glass structure in which drive ICs are mounted on a pad region of an array substrate. .

According to the present invention, a ground terminal of an FPC that is folded to the bottom of a lower cover in a chip on glass liquid crystal display and applies a driving signal to the lower cover is grounded so that the lower cover and the upper cover are grounded to generate a lamp. Image quality can be improved by removing noise signals.

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

3 is a view for explaining a structure in which the lower cover and the upper case of the COG LCD according to the present invention are grounded.

As shown in FIG. 3, the chip on glass liquid crystal panel 105 may mount the gate drive IC and the data drive IC mounted on the gate TCP and the data TCP in FIG. 1 to the pad region of the substrate. The input / output signal lines are formed outside the gate pad and the data pad in the pad region of the array substrate.

Accordingly, in the COG liquid crystal panel 105, drive ICs are mounted in a pad region of a substrate, and an FPC 130 terminal is connected to the input / output signal line to apply a direct drive signal and a data signal to a drive IC mounted on the substrate. do.

That is, when a drive IC is mounted and a driving signal or a data signal is applied through the FPC 130 connected to the input / output signal lines, the input / output signal lines are respectively gate pads through the drive IC mounted on the pad area. And a signal to the data pads.

Therefore, in the structure of the liquid crystal module, the PCBs connected to the gate TCP and the data TCP are folded and attached to the bottom of the lower cover in FIG. 1, but the COG liquid crystal panel 105 is merely a system for directly applying driving and data signals. Since it is connected by the FPC 130, only the FPC 130 is folded and attached to the bottom of the lower cover 122.

 In particular, in the liquid crystal display having the conventional COG structure, even if the noise component generated in the lamp is present in the lower cover 122 and the upper case 101, there is no way to remove it, but in the present invention, FPC 130 The ground line is removed from the signal line of the ground line by contacting it with the lower cover 122.

Therefore, since the lower cover 122 and the upper case 101 in which the noise signals are present by the lamp are removed through the ground line of the FPC 130, there is an advantage that the liquid crystal driving by the noise is not affected.

The ground line of the FPC 130 is connected to the lower cover 122 by solder bonding, or the ground line exposed while attaching the FPC 130 to the lower cover 122 with a tape or an adhesive. The lower cover 122 is contacted.

Alternatively, when the ground line cut out from the FPC 130 does not protrude more than the line insulated with another poly film, and thus it is difficult to contact the lower cover 122, the signal line exposing the ground part 200 made of metal is exposed. After connecting to the, the grounding portion 200 is in contact with the lower cover 122.

Since the lower cover 122 is connected to each other as the upper case 101 is assembled, the lower cover 122 is grounded and the upper case 101 is also grounded.

 Accordingly, when the lamp of the liquid crystal display device having the COG structure is driven as in the present invention, the generated noise signal does not degrade the quality of the liquid crystal display device, and is also caused by the static electricity generated or applied to the lower cover and the upper cover. The liquid crystal display device can be protected.

As described in detail above, the present invention provides a lower cover and an upper cover by contacting a ground terminal of an FPC, which is folded to the bottom of a lower cover and applies a driving signal, to a lower cover in a chip on glass liquid crystal display. It is possible to improve the image quality by removing the noise signal generated from the lamp by grounding.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

1 is a perspective view showing an assembly structure of a liquid crystal display device according to the prior art.

2 is a view showing an FPC connection structure of a COG liquid crystal display according to the prior art.

3 is a view for explaining a structure in which the lower cover and the upper case of the COG liquid crystal display according to the present invention is grounded.

* Description of the symbols for the main parts of the drawings

105: liquid crystal panel 130: FPC

122: lower cover 101: upper case

200: ground portion

Claims (6)

A liquid crystal display module comprising a liquid crystal panel, a backlight assembly, a main frame and a lower cover and upper cases, a gate drive IC and a data drive IC, The ground signal line of the FPC for applying driving signals and data signals to the gate drive IC and the data drive IC mounted on the pad area of the liquid crystal panel and the lower cover or the upper case are grounded to remove noise signals. Liquid crystal display device. The method of claim 1, And the lower cover and the upper case are conductive metals. The method of claim 1, And a ground part made of metal in the ground signal line of the FPC to facilitate contact with the lower cover. The method of claim 1, Part of the ground signal line of the FPC is a liquid crystal display, characterized in that the polyimide film is removed and exposed to the outside. The method of claim 1, And the ground signal line of the FPC and the lower cover are electrically contacted by soldering or tape. The method of claim 1, The liquid crystal display device has a chip on glass structure in which drive ICs are mounted on a pad area of an array substrate.