KR20050077341A - Liquid crystal display device provided with an improved bottom chassis - Google Patents

Abstract

The present invention relates to a liquid crystal display device having an improved heat dissipation performance by increasing the surface area of a bottom chassis. To this end, the liquid crystal display device of the present invention is a liquid crystal display panel assembly for controlling the liquid crystal for displaying an image, a backlight supply for supplying light to the liquid crystal display panel assembly, and improves the brightness while guiding the light, and the bottom housing the backlight assembly It includes a chassis, and the area increase part is formed in the bottom part of a bottom chassis. Through the present invention, it is possible to implement a liquid crystal display device having improved heat dissipation performance and strength.

Description

Liquid crystal display with improved bottom chassis {LIQUID CRYSTAL DISPLAY DEVICE PROVIDED WITH AN IMPROVED BOTTOM CHASSIS}

The present invention relates to a liquid crystal display device having an improved bottom chassis structure, and more particularly, to a liquid crystal display device having an improved heat dissipation performance by increasing the surface area of a bottom chassis.

With the recent development of semiconductor technology, which is rapidly developing in recent years, the demand for flat panel display devices that are smaller and lighter and has improved performance is exploding.

The liquid crystal display (LCD), which has recently been in the spotlight among the flat panel display devices, has advantages such as miniaturization, light weight, and low power consumption, thereby overcoming the disadvantages of the conventional cathode ray tube (CRT). As an alternative means, it has been gradually attracting attention, and is currently used in almost all information processing equipment that requires a display device.

A general liquid crystal display device applies a voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and visually changes optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of the liquid crystal cell emitted by the molecular array. It is a display apparatus which displays information using the modulation of the light by a liquid crystal cell as converting into a change.

Since the liquid crystal of the liquid crystal display does not emit light by itself, the liquid crystal display includes a backlight assembly for providing light to the liquid crystal cell under the liquid crystal cell. The backlight assembly is classified into a direct method and an edge method according to the position of the light source. The direct method refers to a method of directly dimming the front surface of the panel by placing a light source under the LCD panel. It refers to a method of dimming the front of the panel directly by placing a light source. In structural terms, the backlight assembly includes lamps, light guide plates, reflecting plates, optical sheets, and the like. The lamp uses a cold cathode ray tube lamp that generates relatively little heat, generates white light close to natural light, and has a long lifespan.

When light is emitted, the heat generated by the lamp is transmitted to the reflector in contact with the lamp through radiation and is emitted through the bottom chassis in contact with the reflector. At this time, the bottom chassis surface is normally formed flat. However, in recent years, as the size of the liquid crystal display device gradually increases according to consumer's preference, a plurality of lamps must be provided to realize an image having sufficient luminance characteristics. Therefore, a large amount of heat energy is generated as an increased heat source in the backlight assembly of the large liquid crystal display device. In the structure of the bottom chassis, there is a limit in the ability to release the heat energy to the outside, so that the temperature of the ambient temperature cannot be increased smoothly. have. Accordingly, the fluorescent material of the lamp is deteriorated, not only shortening the life of the lamp, but also deteriorating the performance due to the deterioration of the reflector, and causing a problem that the lamp holder for fixing the lamp at the lamp end is deformed by the heat emitted from the lamp. In particular, when the reflecting plate is deteriorated, in the reflecting plate made of a resin and the light reflecting film, the light reflecting film is agglomerated by heat or penetrates into the resin, resulting in a decrease in the reflection efficiency of the reflecting plate, thereby lowering the brightness of the liquid crystal display.

In addition, when the bottom chassis is formed to have a flat surface, the rigidity of the bottom chassis is limited in rigidity, and thus, deformation, such as distortion, may occur due to vibration due to external impact or noise.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object thereof is to improve the structure of the bottom chassis in contact with the lower part of the backlight assembly, thereby improving heat dissipation of the liquid crystal display device and at the same time improving the strength.

The liquid crystal display device according to the present invention for achieving the above object is to supply light to the liquid crystal display panel assembly, the liquid crystal display panel assembly for controlling the liquid crystal for displaying an image, and to guide the light to improve the brightness A backlight assembly, and a bottom chassis for receiving the backlight assembly, characterized in that the area increase portion is formed in the bottom of the bottom chassis.

The above-described area increasing portion may be formed of a plurality of protrusion members.

Here, the protruding members may be formed in a mesh form adjacent to each other.

On the other hand, the protruding member is preferably formed by pressing the bottom chassis.

And it is preferable that the protruding member has a top and inclined surfaces inclined from the top at a predetermined angle at the top.

The protruding member is preferably formed on the entire bottom surface of the bottom chassis.

In addition, the liquid crystal display device according to the present invention is a liquid crystal display panel assembly for controlling the liquid crystal for displaying an image, a backlight assembly for supplying light to the liquid crystal display panel assembly and guides the light to improve the brightness, and a bottom for housing the backlight assembly In the case where the chassis includes a chassis and the cross-sectional area of the bottom of the bottom chassis is A, and the substantial surface area of the bottom chassis is B, B > A is satisfied.

It is preferable that the backlight assembly according to the present invention is a direct type.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. These embodiments of the present invention are merely for illustrating the present invention, but the present invention is not limited thereto.

FIG. 1 is an exploded perspective view of a liquid crystal display according to a first exemplary embodiment of the present invention. In particular, the bottom portion of the bottom chassis is enlarged in a circle.

The liquid crystal display device 100 according to the first exemplary embodiment of the present invention illustrated in FIG. 1 includes a direct backlight assembly 200 for supplying light and a liquid crystal display panel for displaying an image corresponding to the light. Assembly 300. The direct backlight assembly shown in FIG. 1 is merely for illustrating the present invention, but the present invention is not limited thereto. Therefore, the present invention can be applied to an edge type backlight assembly or a wedge type backlight assembly. The backlight assembly 200 supplies light to the liquid crystal display panel assembly 300, guides the light to improve brightness, and the liquid crystal display panel assembly 300 positioned thereon controls the liquid crystal to display an image.

The liquid crystal display panel assembly 300 includes a liquid crystal display panel 315, a tape carrier package (TCP) 325 and 335, and a printed circuit board 320 and 330. The liquid crystal display panel 315 is injected between a TFT substrate 305 including a plurality of thin film transistors (TFTs), a color filter substrate 310 positioned on the TFT substrate 305, and the substrates. It is made of liquid crystal (not shown).

The TFT substrate 305 is a transparent glass substrate on which a matrix thin film transistor is formed, a data line is connected to a source terminal, and a gate line is connected to a gate terminal. In the drain terminal, a pixel electrode made of transparent indium tin oxide (ITO) as a conductive material is formed.

When electrical signals are input from the printed circuit boards 320 and 330 to the data lines and the gate lines of the liquid crystal display panel 315 described above, electrical signals are input to the source and gate terminals of the TFT, Depending on the input, the TFT is turned on or turned off so that an electrical signal necessary for pixel formation is output to the drain terminal.

On the other hand, the color filter substrate 310 is disposed on the TFT substrate 305 thereon. The color filter substrate 310 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process, and a common electrode made of ITO is coated on the entire surface thereof. When power is applied to the gate terminal and the source terminal of the TFT and the thin film transistor is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate. By the electric field, the arrangement angle of the liquid crystal injected between the TFT substrate 305 and the color filter substrate 310 is changed, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel.

In order to control the arrangement angle of the liquid crystal of the liquid crystal display panel 315 and the timing at which the liquid crystals are arranged, a driving signal and a timing signal are applied to the gate line and the data line of the TFT, and the data driving signal is applied to the source side of the liquid crystal display panel 315. A data TCP 325 is attached to determine the timing of application of the gate, and a gate TCP 335 is attached to the gate side to determine the timing of application of the gate driving signal.

The data PCB 320 and the gate PCB 330 for receiving a video signal from the outside of the liquid crystal display panel 315 and applying a driving signal to the data line and the gate line, respectively, are formed on the gate line side of the liquid crystal display panel 315. It is connected to the gate TCP 335 and the data TCP 325 on the data line side.

The data PCB 320 and the gate PCB 330 generate data signals, gate driving signals, which are signals for driving the liquid crystal display device 100, and a plurality of timing signals for applying these signals at appropriate times, respectively. The gate driving signal is applied to the gate line of the liquid crystal display panel 315 through the gate TCP 335, and the data signal is applied to the data line of the liquid crystal display panel 315 through the data TCP 325.

The backlight assembly 200 is provided below the liquid crystal display panel assembly 300 to provide uniform light to the liquid crystal display panel assembly 300.

The backlight assembly 200 includes a plurality of lamps 155 and lamps 155 that are spaced apart at a predetermined distance from the storage container 150 having an upper surface thereof to provide a storage space having a hexahedron shape, and the storage space of the storage container 150. Reflective plate 160 that reflects the light emitted from the lamp and located in the lower front of the), and the optical sheet for providing light to the liquid crystal display panel assembly 300 by securing the luminance characteristics of the light from the lamp 155 ( 170). The position of the optical sheets 170 seated on the upper portion of the storage container 150 is guided to an upper mold frame 400 that is coupled to the storage container 150 so as to face each other. As described above, the backlight assembly 200 is accommodated in the bottom chassis 110 by combining all the components.

Although not shown in FIG. 1, an inverter board, which is a power supply PCB, and a signal conversion PCB are installed on a rear surface of the bottom chassis 110 exposed through an open bottom surface of a lower mold frame (not shown). The inverter board transforms an external power supply to a constant voltage level to provide the lamp 155, and the signal conversion PCB is connected to the aforementioned data PCB 320 and the gate PCB 330 to convert analog data signals into digital data signals. To the liquid crystal display panel 315.

The data PCB 320 and the gate PCB 330 are bent outside the upper mold frame 400 on the liquid crystal display panel assembly 300 to prevent the liquid crystal display panel assembly 300 from being separated from the bottom chassis 110. It has a top chassis 600 for.

Although not shown in FIG. 1, a front case and a rear case are positioned at an upper portion of the top chassis 600 and a lower portion of the bottom chassis 110, respectively, to form a liquid crystal display device 100 by combining them.

In the liquid crystal display device of the present invention, when the cross-sectional area of the bottom of the bottom chassis is A, and the substantial surface area of the bottom chassis is B, B> A is satisfied. That is, the bottom surface of the bottom chassis is deformed so that the substantial surface area according to the deformation is larger than the original cross-sectional area, so that the heat dissipation is more smoothly performed through the bottom chassis.

In particular, the present invention is suitable for a liquid crystal display device having a direct backlight assembly, as shown in FIG. That is, as shown in Figure 1, in the large liquid crystal display device that requires high brightness, such as LCD TV, it is required to install a plurality of lamps, it is preferable to improve the structure of the bottom chassis as shown in the present invention to increase the heat radiation effect. Do.

As shown in the enlarged circle of FIG. 1, an area increasing portion is formed at the bottom of the bottom chassis 110. The area increasing part expands the surface area of the bottom chassis 110 in contact with the bottom of the reflecting plate 160 with respect to the light heat transmitted to the reflecting plate 160 through the lamp 155, so that heat dissipation is further increased through the bottom chassis 110. It can be made efficiently and, at the same time, the strength can be improved due to the increase in thickness. As shown in FIG. 1, the area increase part may be formed over the entire bottom surface of the bottom chassis 110. In addition, although not shown, it may be concentrated in the vicinity of the lower end of the lamp which is expected to generate a relatively large amount of heat.

As shown in FIG. 1, the area increasing part formed on the bottom chassis 110 includes a plurality of protrusion members 120. As shown in the enlarged circle of FIG. 1, the protruding members 120 may be formed in a mesh form adjacent to each other. The protruding members 120 shown in the enlarged circle of FIG. 1 have inclined surfaces 120b and 120c inclined from the uppermost part 120a at a predetermined angle at the uppermost part 120a and the uppermost part 120a. As a result, when the heat is transferred from the lower portion of the reflector plate 160 to the protruding member 120 formed at the bottom of the bottom chassis 110, the thermal contact area gradually widens, thereby further increasing the heat dissipation effect.

On the other hand, the protruding members 120 may be formed to jump so as not to be adjacent to each other. In an exemplary embodiment of the present invention, the protruding member may be formed by die-casting or pressing, but it is more simple and less expensive to process the protruding member by pressing the bottom chassis. There is an advantage.

Due to the increase in the surface area of the bottom chassis 110 due to the formation of the protruding members 120, heat generated from the lamp 155 may be transmitted from the lower portion of the reflector 160 to radiate heat more efficiently. Also. By forming the protrusion-shaped member 120 having a predetermined shape at the bottom of the bottom chassis 110, the bottom chassis 100 may be enlarged to form a more three-dimensional shape by escaping the planar shape, but the strength is increased. Therefore, the bottom chassis is not easily deformed by external shock and vibration.

FIG. 2 is a plan view of a bottom chassis according to a first embodiment of the present invention shown in FIG. 1. As shown in FIG. 2, the protruding member 120 of the bottom chassis 110 according to the first embodiment of the present invention is formed on the front surface of the bottom of the bottom chassis 110 to further increase the heat dissipation effect. As shown in FIG. 2, the protruding members 120 according to the first embodiment of the present invention are formed adjacent to each other, and the three pairs of protruding members 120 adjacent to each other are formed to face each other. 2 is merely to illustrate the arrangement of the protruding members 120 according to the first embodiment of the present invention, but the present invention is not limited thereto. Accordingly, the protrusion member can be disposed on the bottom chassis in various other forms.

3 is a plan view of a bottom chassis according to a second embodiment of the present invention, in which the arrangement state of the protruding members according to the first embodiment of the present invention is modified. Accordingly, the rest of the contents except for the arrangement state of the protruding members in the second embodiment of the present invention are the same as those of the first embodiment of the present invention described above. 3 shows an arrangement of the protruding members 130 according to the second embodiment of the present invention.

The protruding members 130 according to the second embodiment of the present invention are formed to be adjacent to each other on the bottom of the bottom chassis 110, and the two pairs of protruding members 130 adjacent to each other are formed to face each other.

4 is a plan view of a bottom chassis according to a third embodiment of the present invention, in which the arrangement state of the protruding members according to the first embodiment of the present invention is modified. Accordingly, the rest of the contents except for the arrangement state of the protruding members in the first embodiment of the present invention are the same as those of the first embodiment of the present invention described above. The enlarged circle of FIG. 4 shows an arrangement state of the protruding members 140 according to the third embodiment of the present invention.

The protruding members 140 according to the third embodiment of the present invention are formed to face each other adjacent to each other on the bottom of the bottom chassis 110.

As described above, the liquid crystal display according to the present invention has an area increase part formed at the bottom of the bottom chassis, thereby increasing the surface area of the bottom chassis so that heat transferred from the lamp can be more easily discharged to the outside.

In addition, since the above-described area increasing part may be formed of a plurality of protrusion members, the bottom chassis may escape from a planar shape to form a more three-dimensional shape, thereby increasing the strength of the bottom chassis. Therefore, it can withstand external shocks well.

In addition, since the above-described protruding members are formed adjacent to each other in the form of a mesh, it is possible to concentrate the bottom portion of the bottom chassis so that the heat of the portion where the lamp is arranged can be more easily released.

On the other hand, the aforementioned projection member is formed by pressing the bottom chassis, there is an advantage that the manufacturing process is simple and the process cost is low.

In addition, the above-described protruding member has a top and an inclined surface inclined from the top at a predetermined angle at the top, so that the heat contact area gradually widens closer to the bottom chassis, thereby further increasing the heat dissipation effect.

And since the protruding member is formed on the entire bottom surface of the bottom chassis, the heat dissipation effect can be further enhanced.

In addition, the liquid crystal display according to the present invention satisfies B > A when the cross-sectional area of the bottom of the bottom chassis is A and the substantial surface area of the bottom of the bottom chassis is B, thereby increasing the surface area of the bottom chassis to dissipate heat. Can be further increased.

The liquid crystal display device of the present invention described above is particularly preferably applied to a direct type backlight assembly, which generates a lot of heat, thereby easily solving the problem of heat dissipation in an LCD TV.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

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

2 is a plan view of a bottom chassis according to a first embodiment of the present invention.

3 is a plan view of a bottom chassis according to a second exemplary embodiment of the present invention.

4 is a plan view of a bottom chassis according to a third exemplary embodiment of the present invention.

Claims (8)

A liquid crystal display panel assembly which controls a liquid crystal to display an image, A backlight assembly for supplying light to the liquid crystal display panel assembly and guiding the light to improve brightness; A bottom chassis for housing the backlight assembly Including, And an area increasing portion is formed at the bottom of the bottom chassis. In claim 1, And the area increasing portion is formed of a plurality of protrusion members. In claim 2, The projection member is a liquid crystal display device formed in a mesh form adjacent to each other. In claim 2, And the protrusion member is formed by pressing the bottom chassis. In claim 2, The projection member has a top portion and an inclined surface inclined from the top at a predetermined angle at the top portion. In claim 2, The projection member is formed on the entire bottom surface of the bottom chassis. A liquid crystal display panel assembly for controlling liquid crystal for displaying an image, A backlight assembly which supplies light to the liquid crystal display panel assembly and improves brightness while guiding the light; A bottom chassis for housing the backlight assembly Including, A cross-sectional area of the bottom of the bottom chassis is A, and a substantial surface area of the bottom chassis of B is B, where B> A is satisfied. The method of claim 1 or 7, The backlight assembly is a direct type liquid crystal display device.