KR100757783B1 - Liquid crystal display device - Google Patents

Abstract

Disclosed is a liquid crystal display device which minimizes damage to internal components due to external impact or excessive force. In order to prevent the lamp or the light guide plate from being damaged by an external impact or excessive force, the storage container supporting the lamp, the light guide plate, the diffusion sheets, the reflector, etc. and the chassis combined with the storage container are mutually coupled to each other. As a result, the force or impact applied from the outside is absorbed to the chassis having a much higher strength than the storage container, thereby minimizing component breakage caused by the shape change of the storage container and the shape change of the storage container.

LCD, Storage Container, Chassis, Fastening

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

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

FIG. 2 is a cross-sectional view taken along the line II-II in the state in which the liquid crystal display according to the exemplary embodiment of the present invention shown in FIG. 1 is assembled.

3 is an enlarged view of a portion A of FIG. 2.

Figure 4 is a plan view showing a portion to fasten the chassis and the storage container with a fastening screw according to an embodiment of the present invention.

5 is a partial cutaway perspective view illustrating a structure of a fastening groove of a chassis fastened to a fastening screw according to an embodiment of the present invention.

6 is an enlarged partial cutaway perspective view showing a portion of the container and the chassis coupled by the fastening screw according to an embodiment of the present invention.

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 which prevents breakage of a component of a weakly brittle backlight assembly due to a shape change generated by an excessive force or impact applied from the outside.                         

Recently, due to the technology development of the information processing device, it is possible to process a large amount of data in a short time, the rapid development of technology throughout the industry.

Despite the important functions and roles of such information processing devices, their use is greatly limited by the information processing devices alone. This is especially true in an information processing apparatus that plays a role mainly in providing processed information to a user.

The first cause of such a limitation is that the data processed by the information processing device has an electrical signal form, and the second cause is that the user cannot recognize the data in this electrical signal form.

For this reason, most information processing apparatuses require a so-called “display device,” which is a display device capable of recognizing characters, images, and images that have data in the form of electrical signals processed by the information processing apparatus. It acts as an interface for converting to moving images.

As the display device has been changed and developed in various forms, a large-screen display, a full-color display, and a liquid crystal display device, which is particularly light and bulky, have been developed.

The liquid crystal display device performs display through a liquid crystal display panel assembly utilizing the unique electro-optical properties of the liquid crystal. In this case, since the liquid crystal included in the liquid crystal display panel assembly merely controls the amount of light transmission precisely and does not generate light by itself, a desired display screen may not be obtained regardless of the precise control of the liquid crystal in the absence of a light source.

This proves that light is required in any form to perform the display by the liquid crystal display.

The light may be light generated from sunlight or room lighting, or artificial light generated by consuming electrical energy from the liquid crystal display itself.

In the case of using the light generated from sunlight or room lighting for the display of liquid crystal display devices, it is frequently impossible to perform the display in the dark where no light is present. Mainly used.

Artificial light mainly uses a cold cathode ray tube lamp with high heat generation and high luminance. However, the cold cathode ray tube lamp alone is also difficult to perform a precise display.

This is because a liquid crystal display device requires a surface light source distribution having a uniform optical distribution over the entire display area, but a cold cathode ray tube lamp has a linear light source distribution with high luminance unevenness.

As a result, when the display is performed using only a cold cathode ray lamp, the display performance is not obtained due to the extremely uneven optical distribution.

For this reason, the liquid crystal display includes a light guide panel for changing the line light source distribution to a surface light source distribution, an optical sheet for further uniformizing the distribution of light changed from the light guide plate to the surface light source distribution, and recycling of leakage light. A reflector or the like is further provided.

In addition, the cold cathode ray tube lamps, the light guide plate, and the optical sheets are housed in a storage container so as to be fixed at a designated position, and the liquid crystal display panel assembly is fixed to the storage container, and then the storage container and the liquid crystal display panel assembly have an effective display area. It is fixed by this open angled chassis.

Recently, in order to reduce the volume and weight of the liquid crystal display, the diameter of the cold cathode ray tube lamp is further reduced, the light guide plate and the optical sheet are thinner, and the thickness is as thin as possible except for the essential part of the storage container. It is produced.

Such an effort plays a decisive role in greatly reducing the volume and weight of the liquid crystal display, but causes a problem that expensive components are easily broken even by a slight impact from the outside.

For example, breakage of a cold cathode ray tube lamp | ramp can be mentioned.

Specifically, when an impact is applied from the outside while the LCD is completely assembled, the impact is transmitted to the light guide plate and the diffusion sheet, and the impact transmitted to the light guide plate and the diffusion sheet is transferred to the storage container.

However, when the thickness of the storage container is made too thin, the shock absorbing shocks transmitted to the light guide plate and the diffusion sheet are not absorbed by the storage container, so that the storage container is temporarily deformed, whereby the light guide plate is separated from the designated position and thus the cold cathode ray Hit with a tube lamp. As such, when the light guide plate collides with the cold cathode ray tube lamp, breakage of the cold cathode ray tube type lamp having weak brittleness is inevitable.

In addition, when an excessive force is applied to the liquid crystal display device from the outside, the excessive force is accompanied by a change in the shape of the storage container and a position change of the light guide plate and the diffusion sheets.

In such a case where the position change of the light guide plate and the diffusion sheet occurs, breakage of the cold cathode ray tube type lamp also occurs.

In order to overcome the two cases described above, if the thickness of the storage container is increased, there is another problem that the overall volume of the liquid crystal display is increased.

Accordingly, the present invention has been made in view of such a conventional problem, and an object of the present invention is to prevent breakage of components constituting the liquid crystal display device even when excessive force or impact is applied to the liquid crystal display device from the outside.

The liquid crystal display device according to the present invention for realizing the object of the present invention is a liquid crystal display panel assembly for controlling the liquid crystal to display an image, a backlight assembly including a lamp for supplying light to the liquid crystal display panel assembly, the The liquid crystal display panel assembly and the backlight assembly are accommodated, the storage container having at least one coupling groove formed at a position corresponding to the liquid crystal display panel assembly at a side thereof, and the liquid crystal display panel assembly mounted on the storage container. And a chassis covering the liquid crystal display panel assembly such that an effective display area of the liquid crystal display panel assembly is opened, and having a hole formed in a position corresponding to the coupling groove in combination with the storage container.

Hereinafter, a unique operation and effects of a more specific configuration and configuration of a liquid crystal display according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, the liquid crystal display device 900 includes a chassis 100, a liquid crystal display panel assembly 200, a backlight assembly, and a storage container 410 as a whole.

First, the liquid crystal display panel assembly 200 will be described. The liquid crystal display panel assembly 200 is composed of a liquid crystal display panel 230 and a driving signal applying unit.

Specifically, the liquid crystal display panel 230 is composed of a TFT substrate 220, a liquid crystal (not shown), and a color filter substrate 210 as a whole.

More specifically, the TFT substrate 220 is composed of a transparent glass substrate, a plurality of thin film transistors, pixel electrodes, and driving signal lines.

More specifically, a plurality of thin film transistors (not shown) are arranged in a matrix form on one side of the glass substrate by a semiconductor thin film process.

Specifically, a thin film transistor corresponding to three times the required horizontal resolution is formed on the glass substrate, and a thin film transistor corresponding to three times the required vertical resolution is formed.

In this case, a gate line is commonly connected to the gate electrodes of the thin film transistors in each column, and a data line insulated from the gate line is formed at the source electrodes of the thin film transistors in each row.

On the other hand, the pixel electrodes are formed on the drain electrodes of all the thin film transistors formed on the glass substrate and have a predetermined area and a transparent and conductive indium tin oxide material.

The TFT substrate 220 having such a configuration overlaps the color filter substrate 210 in an aligned state.

The color filter substrate 210 includes a transparent substrate, an RGB pixel (not shown), and a common electrode.

First, on a transparent substrate somewhat smaller than the TFT substrate 220, an RGB pixel facing the pixel electrode formed on the TFT substrate 220 is formed very precisely by a semiconductor thin film process.

Thereafter, a common electrode is formed on the upper surface of the RGB pixel to have a predetermined thickness of a transparent and conductive indium tin oxide material over the entire surface of the transparent substrate.

Before the TFT substrate 220 and the color filter substrate 210 are aligned, the spacers are evenly distributed between the TFT substrate 220 and the color filter substrate 210 to secure the thickness uniformity of the liquid crystal. A sealant that limits the position of the liquid crystal is applied.

Thereafter, liquid crystal is injected between the TFT substrate 220 and the color filter substrate 210 fixed by the sealant and the spacer.

Subsequently, an output terminal of the gate flexible printed circuit 240 is coupled to the gate line, and an output terminal of the data flexible printed circuit 250 is coupled to the data line.

Meanwhile, a gate printed circuit board 270 is coupled to an input terminal of the gate flexible printed circuit 240, and a data printed circuit board 260 is coupled to an input terminal of the data flexible printed circuit 250.

Such light may be displayed from the liquid crystal display panel assembly 230 only when light is supplied from the backlight assembly to the liquid crystal display panel assembly 230.

The backlight assembly generally includes a lamp assembly 300, an optical sheet 450, a light guide plate 440, and a reflector plate 430.

The lamp assembly 300 again consists of a lamp 320 and a lamp cover 310.

The lamp 320 uses a cold cathode ray tube lamp having a low heat generation, a long lifetime, and a high luminance.

The lamp cover 310 has a shape in which a plate having a high reflectance, high thermal conductivity, and a thin thickness is rounded by 180 ° to have a semicircular cross section.

The lamp cover 310 collects light generated radially from the lamp 320 in the opened direction of the lamp cover 310.

As such, the light collected by the lamp cover 310 still has a light distribution in the form of a line light source, but in order to supply light having a uniform optical distribution over the entire area of the liquid crystal display panel assembly 230, It should be changed to the light distribution in the form of surface light source.

As such, in order to change the light distribution in the form of a line light source into the light distribution in the form of a surface light source, a light guide panel 440 having a thin plate shape is installed in the lamp assembly 300.

The light guide plate 440 not only changes the distribution of light generated from the lamp assembly 300 into a surface light source shape but also has a direction toward the liquid crystal display panel assembly 230.

At this time, the optical distribution of the light changed from the light guide plate 440 to the surface light source shape and the direction of travel is not very uniform. And an optical sheet 450 such as a diffusion sheet, and a reflecting plate 430 for recycling the light leaked from the light guide plate 440 is disposed on the bottom surface of the light guide plate 440.

On the other hand, in order to ensure that the lamp assembly 300, the optical sheet 450, the light guide plate 440, the reflecting plate 430 and the liquid crystal display panel assembly 230 is always fixed at a designated position, they are opened in a hexahedral shape. It is stored in the storage container 410.

In particular, in order to prevent the light guide plate 440 from flowing from the storage container 410, a locking protrusion (not shown) protrudes from the side surface of the light guide plate 440, and a locking protrusion is formed on an inner side surface of the storage container 410 corresponding to the locking protrusion. A locking groove (not shown) is formed to be coupled with the machine.

On the other hand, at least one coupling groove 415a is formed on a side surface of the storage container 410 for the purpose of preventing the shape of the storage container 410 from being changed by an external impact or an excessive force. . The detailed function of the coupling groove 415a will be described later.

The coupling groove 415a is formed at a position corresponding to the liquid crystal display panel assembly 230 among the side surfaces of the storage container 410. For example, the coupling groove 415a may be formed at a position corresponding to the TFT substrate 220 of the liquid crystal display panel assembly 230. In addition, the coupling groove 415a may be formed on the side surface of the storage container 410 adjacent to the lamp 320 and the other side facing the side surface.
Meanwhile, the storage container 410 facing the data flexible printed circuit 250 or the gate flexible printed circuit 240 bent to the rear side of the storage container 410 in order to reduce the invalid display area of the liquid crystal display device. This part has a very thin flesh thickness with respect to the other part, and since this part is too thin in thickness, it is very difficult to form the coupling groove 415a.

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However, since this part is very thin in thickness, it is also a part where shape change and warpage occur more frequently than other parts due to a small external force or impact.

In the present invention, in order to overcome such a problem, as shown in FIG. 6, the present invention is relatively thicker than other parts of the storage container corresponding to the data flexible printed circuit 250 or the gate flexible printed circuit 240. Coupling grooves 415a were formed in the partition wall 415 provided to have a thickness of one year. More specifically, the coupling groove 415a is formed on the side surface of the barrier rib 415 among the barrier rib 415.

In such a form, the reflecting plate 430, the light guide plate 440, the lamp assembly 300, and the optical sheet 450 are coupled to the storage container 410 in which the coupling groove 415a is formed. Again, the liquid crystal display panel assembly 230 described above is seated.

At this time, since the liquid crystal display panel assembly 230 is simply seated in the storage container 410, the liquid crystal display panel assembly 230 has a very weak structure against horizontal movement or vertical movement.

In addition, the liquid crystal display panel assembly 230 is composed of a glass material having a very weak brittleness as well as a horizontal movement or a vertical movement. In particular, the edge portion brittleness of the liquid crystal display panel assembly 230 is particularly vulnerable to impact. The part must not be broken.

In this way, the chassis 100 made of stainless material is coupled to the upper surface of the liquid crystal display panel assembly 230 in terms of the vertical and horizontal movement limits of the liquid crystal display panel assembly 230 and the protection of the liquid crystal display panel assembly 230.

The chassis 100 may expose the effective display area of the upper surface of the liquid crystal display panel assembly 230 to the outside and pressurize, fix and prevent edge breakage of the upper surface corresponding to the ineffective display area surrounding the effective display area. It requires a portion and a portion to be combined with the container 410.

The chassis 100 for implementing this is manufactured so that the profile has a square frame shape with a bracket shape. At this time, one of the two surfaces constituting the chassis 100 will be defined as a first side, and the other one will be defined as a second side.

In this case, when the chassis 100 is coupled to the storage container 410, the first side of the chassis 100 presses the upper surface of the liquid crystal display panel assembly 230, and the second side of the chassis 100 is the storage container. Opposite sides of 410.

At this time, the second side of the chassis 100 inevitably has a portion facing the coupling groove 415a formed on the side of the storage container 410 described above.                     

As such, the second side of the chassis 100 facing the coupling groove 415a formed in the storage container 410 is provided with a fastening hole 110 provided to limit the movement of the storage container 410.

At this time, the thickness of the flesh around the fastening hole 110 may be manufactured to be somewhat thinner or recessed than the other parts. Thus, processing the fastening hole 110 around the fastening screw 120 is coupled to the fastening hole 110. This is to prevent the increase in volume by inhibiting the protruding to the outside of the chassis 100 as much as possible.

The coupling hole 110 and the coupling groove 415a of the storage container 410 of the chassis 100 provided as described above are firmly coupled by the fastening screw 120.

As such, by combining the storage container 410 and the chassis 100 with the fastening screw 120, the impact or excessive force applied from the outside is mostly absorbed in the chassis 100 having a much higher strength than the storage container 410.

As a result, the deformation of the storage container 410 is minimized, thereby preventing the light guide plate 440 from being separated from the designated position with respect to the storage container 410, and of course, while the light guide plate 440 is separated from the designated position, the cold cathode ray tube type lamp By pressing the 320, the cold cathode ray tube type lamp 320 may be prevented from being damaged.

As described in detail above, the storage container for fixing the lamp assembly, the light guide plate, the optical sheet, the reflecting plate, and the liquid crystal display panel assembly is firmly fixed to the chassis having a higher strength than the storage container so that a strong impact or Even if an external force is applied, the shape change of the storage container is prevented from occurring, thereby preventing the damage of the components accommodated in the storage container, particularly the lamp assembly.

In the present invention, an embodiment in which a coupling groove is formed on the side of the storage container, and a coupling hole is formed in the chassis coupled to the storage container, and then the coupling hole and the fastening hole are coupled to each other by a fastening screw are described and illustrated. In other words, the storage container and the chassis can be combined by various methods without the use of fastening screws. Those skilled in the art will appreciate the various embodiments of the present invention by one embodiment of the present invention. It will be apparent that various modifications of the present invention, such modifications, can also be made without departing from the scope of the claims of the present invention which will be described later.

Claims (7)

A liquid crystal display panel assembly for controlling the liquid crystal to display an image; A backlight assembly including a lamp to supply light to the liquid crystal display panel assembly; A storage container accommodating the liquid crystal display panel assembly and the backlight assembly and having at least one coupling groove formed at a position corresponding to the liquid crystal display panel assembly at a side surface thereof; And Covering the liquid crystal display panel assembly such that the effective display area of the liquid crystal display panel assembly is opened while the liquid crystal display panel assembly is seated in the storage container, and a joining hole is combined with the storage container to correspond to the coupling groove. And a chassis formed. delete The liquid crystal display of claim 1, wherein the coupling groove is formed on one side of the storage container adjacent to the lamp and the other side facing the one side. The liquid crystal display device according to claim 1, wherein the coupling groove and the fastening hole are fastened by fastening screws. 5. The liquid crystal display device according to claim 4, wherein the fastening holes are recessed so that the fastening screws do not protrude after being engaged with the fastening screws. The liquid crystal display of claim 1, wherein the coupling groove is formed in a partition wall of the storage container corresponding to a flexible printed circuit installed in the liquid crystal display panel assembly and an adjacent flexible printed circuit. A liquid crystal display panel assembly for controlling the liquid crystal to display an image; A backlight assembly including a lamp to supply light to the liquid crystal display panel assembly; A storage container accommodating the liquid crystal display panel assembly and the backlight assembly and having at least one fastening groove formed at a position corresponding to the liquid crystal display panel assembly on the side and the other sides of the backlight assembly facing the lamp; And Covering the liquid crystal display panel assembly such that the effective display area of the liquid crystal display panel assembly is opened while the liquid crystal display panel assembly is seated in the storage container, and is coupled to the storage container to a screw corresponding to the fastening groove. And a chassis in which a fastening hole is formed to be engaged with the fastening groove.

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