KR100295823B1 - Liquid crystal display with defect protection on tape carrier packages - Google Patents

Abstract

The present invention relates to a liquid crystal display device having a tape carrier defect prevention function that minimizes stress concentrated on the bent portion of the tape carrier package to prevent disconnection of the tape carrier package.

The liquid crystal display device having the anti-bonding function of the tape carrier package according to the present invention includes tape carrier package reinforcing means attached to the right angles of the tape carrier packages in the transverse direction to minimize stress applied to the tape carrier package.

Accordingly, the liquid crystal display having the defect preventing function of the tape carrier package according to the present invention minimizes the stress applied to the bent portion of the tape carrier package to prevent line breakage of the tape carrier package.

Description

Liquid Crystal Display Apparatus with Tape Carrier Package of Defect Preventing Function

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 having a defect preventing function of a tape carrier which minimizes stress concentrated on the bent portion of the tape carrier package and prevents disconnection of the tape carrier package.

Recently, liquid crystal displays (hereinafter referred to as "LCDs") are characterized by light weight, thinness, low power consumption, and the like, and the image quality is rapidly improved by the improvement of liquid crystal materials and the development of micro pixel processing technology. In addition, the application range is gradually increasing. Looking at the application range of such liquid crystals, applications, such as a small display, such as a project display (Project Display) for progressively small high-precision display and laptop computer (NoTe Book Personal Computer (hereinafter referred to as "NTPC")) In addition, a wide range of applications are being progressed in large, multi-pixel display applications such as workstations and televisions.

Normally, an LCD is composed of a liquid crystal panel and a driving circuit portion for driving the liquid crystal panel. The liquid crystal panel includes liquid crystal cells arranged in a matrix between two glass substrates (ie, upper glass and lower glass) and switch elements for switching signals supplied to these liquid crystal cells, respectively (ie TFT arrays). It consists of. The driving circuit unit is mounted on a printed circuit board (hereinafter referred to as "PCB") to drive the liquid crystal panel. At this time, TCP (Tape Carrier Package; hereinafter referred to as "TCP") is used for signal transmission between the liquid crystal panel and the PCB and directly attached to the lower glass and the PCB using a conductive resin. TCP has a structure in which a single layer or multiple layers of metallic conductive layers are inserted between layers of flexible materials such as polyamide.

Referring to FIG. 1, an LCD according to the related art includes a liquid crystal display module (hereinafter referred to as "LCM") for displaying an image corresponding to an image signal and a driving circuit unit for driving an LCM. A printed circuit board (hereinafter, referred to as "PCB") is formed in a stacked structure sequentially. Looking at the LCM, the LCM is a light guide plate 12 for guiding a light beam generated from a light source (not shown), the sheet 10 for advancing the light beam guided from the light guide plate 12 in a vertical direction to the front, A lower polarizing plate 8 for polarizing a light beam via the sheet 10, a lower glass 6 for mounting switch elements, and an upper glass 4 laminated with the lower glass 6 to form a liquid crystal layer And an upper polarizing plate 2 for polarizing the light beam passing through the upper glass 4. The LCM drives the switch elements in accordance with control signals and image signals of driver integrated circuits (hereinafter referred to as "D-ICs") connected to the PCB 14 to change the arrangement of the liquid crystals. An image corresponding to the video signal is displayed by the optical path formed according to the arrangement of the liquid crystals. Meanwhile, a plurality of TCPs 16 are connected between the liquid crystal panel and the PCB of the LCM to transmit control signals and video signals of the PCB 14 to the liquid crystal panel. In this case, the TCP 16 is connected between the liquid crystal panel and the PCB 14 to form a "c".

On the other hand, referring to Figure 2 is a cross-sectional view for explaining the deformation of the TCP according to the deformation of the liquid crystal panel. Since LCDs are manufactured to be enlarged and / or thinned according to their application, bending rigidity due to external shocks and vibrations due to structural defects is extremely weak. In fact, when external shock and vibration are applied, the liquid crystal panel 18 is deformed to an amplitude of up to ± 4 mm. At this time, when an external shock and vibration are applied and a bending load is applied, as shown in FIG. 2, the liquid crystal panel 18 is deformed by drawing an arc. In this case, since the right angle portion 16a of the TCP 16 has a large resistance to bending load structurally, it does not respond to deformation of the liquid crystal panel and maintains its original state. Accordingly, relative deflection occurs in the bent portion 16b of the TCP so that stress is concentrated, and when such deformation is repeatedly made up and down, the TCP 16 exceeds the fatigue limit and breaks the disconnection of the TCP 16 line. There is a problem that causes the display of the liquid crystal display device to be impossible.

Accordingly, an object of the present invention is to provide a liquid crystal display device having a defect preventing function of a tape carrier which minimizes stress concentrated on the bent portion of the tape carrier package and prevents disconnection of the tape carrier package.

1 is a cross-sectional view showing a liquid crystal display device according to the prior art.

2 is a view illustrating a deformation of a tape carrier package according to a deformation of a liquid crystal panel.

3 is a view showing a liquid crystal display device according to the present invention;

4 is a view for explaining the deformation of the tape carrier package according to the deformation of the liquid crystal panel.

<Description of Symbols for Main Parts of Drawings>

2: upper polarizer 4: upper glass

6: lower glass 8: lower polarizing plate

10 sheet 12: light guide plate

14: printed circuit board 16, 26: tape carrier package

18,22: liquid crystal panel 24: tape carrier package reinforcement

In order to achieve the above object, a liquid crystal display device having a coupling preventing function of TCP according to the present invention includes a tape carrier package reinforcing means attached to a right angle portion of tape carrier packages in a horizontal axis direction to minimize stress applied to the tape carrier package. Equipped.

Other objects and features of the present invention other than the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.

With reference to Figures 3 to 4 will be described a preferred embodiment of the present invention.

Referring to FIG. 3, a liquid crystal display device having a defect preventing function of TCP according to the present invention is attached between the TCPs 26 and the TCPs 26 electrically connecting the liquid crystal panel and the PCB. It is provided with a TCP reinforcing portion 24 to minimize. In the liquid crystal display, a plurality of TCPs 26 are arranged to electrically connect the liquid crystal panel 22 and the PCB (not shown). When the liquid crystal panel 22 is deformed by external shock and vibration applied to the liquid crystal panel 22 by attaching the TCP reinforcing portion 24 in the horizontal axis direction of the TCPs 26, the respective TCPs 26 are liquid crystals. By flexibly deforming along the deformation curve of the panel 22, the stress concentrated in the TCP vertebra is canceled out. At this time, the TCP reinforcing portion 24 is configured in a relatively hard tape form is attached to the right angle portion of the TCP (26). 4 will be described with reference to the modification of the TCP (26) according to the deformation of the liquid crystal panel. When external shock and vibration are applied to the liquid crystal panel 22 and a bending load is applied, as shown in FIG. 4, the liquid crystal panel 22 is deformed by drawing an arc. In this case, the TCP reinforcing portion 24 attached to the right angle portion of the TCP 16 generates a reaction force in the direction of reducing the relative displacement occurring between the TCP 26 and the TCP 26 in response to the deformation of the liquid crystal panel. Let's go. Accordingly, each of the TCP 26 is flexibly deformed along the deformation curve of the liquid crystal panel 22, thereby canceling the stress concentrated on the bent portion of the TCP 26, thereby acting on the bent portion of the TCP 26. By minimizing the stress to prevent the line break of the TCP (26).

As described above, the liquid crystal display device having the defect preventing function of the TCP according to the present invention has an advantage of minimizing the stress acting on the bent portion of the TCP to prevent the line breakage of the TCP.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (2)

A liquid crystal display device having a plurality of tape carrier packages connected with a bent portion between a printed circuit board and a liquid crystal panel, the liquid crystal display device being connected to the flat portions of the tape carrier packages adjacent to the bent portion to act on the bent portion of the tape carrier package. And a tape carrier package reinforcing member for reducing stress to be provided. The liquid crystal display of claim 1, wherein the tape carrier package reinforcing member is a hard tape.