KR20050087232A - Liquid crystal display provided with a shield case for discharging heat - Google Patents

Abstract

The present invention relates to a liquid crystal display device having an improved structure of a shield case to more easily discharge heat generated from a backlight to the outside. To this end, the liquid crystal display device of the present invention, a liquid crystal display panel assembly that displays an image, and a liquid crystal display panel assembly comprising at least one TCP connected to the liquid crystal display panel to transmit an electric drive signal, the optical display on the liquid crystal display panel assembly A backlight assembly including at least one light emitting lamp for providing a cover, and a printed circuit board connected to the TCP and attached to one surface of the backlight assembly, the one side of the backlight assembly being connected to the TCP connection side of the printed circuit board; Adjacent protrusions are characterized in that they comprise a shield case formed alternately. The present invention can improve the display quality of the liquid crystal display by dissipating heat generated in the liquid crystal display.

Description

Liquid Crystal Display with Heat Dissipation Shield Case {LIQUID CRYSTAL DISPLAY PROVIDED WITH A SHIELD CASE FOR DISCHARGING HEAT}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having an improved structure of a shield case to more easily discharge heat generated from a backlight to the outside.

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 device does not emit light by itself, the liquid crystal display includes a backlight assembly for providing light to the liquid crystal display panel under the liquid crystal display panel. In structural terms, the backlight assembly includes lamps, light guide plates, reflecting plates, optical sheets, and the like. Lamps, which are backlights, generate relatively little heat, generate white light that is close to natural light, and use a cold cathode ray tube lamp that 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. However, recent liquid crystal display devices have tended to maximize the advantages of the flat panel display panel by minimizing the bezel size of the liquid crystal display device according to consumer preferences. Therefore, since the distance between the lamp and the liquid crystal display panel is gradually closer to each other, the temperature of the liquid crystal display panel is increased, thereby causing a phase shift in the liquid crystal.

In addition, as the size of the liquid crystal display device gradually increases according to the needs of consumers, it is necessary to install a plurality of lamps in order to realize an image having sufficient luminance characteristics. Therefore, the backlight assembly of a large liquid crystal display device generates a lot of heat energy due to an increase in lamps. Due to its structure, there is a limit in the ability to release heat energy to the outside. As a result, the display quality of the liquid crystal display panel is deteriorated. In addition, since the source PCB (printed crcuit board) is located directly below the bottom chassis where the lamp is located, the heat generated from the lamp is prevented from being discharged, so that the liquid crystal located at the upper left end of the LCD panel is easily deteriorated. There is a problem.

In order to solve this problem, a low temperature lamp or a method of changing the material of the top chassis is used, but there are limitations in terms of structure.

The present invention is to solve the above problems, it is an object to more easily discharge the heat generated from the lamp to the outside by using a shield case surrounding the printed circuit board as a heat dissipation member.

The liquid crystal display device of the present invention for achieving the above object comprises a liquid crystal display panel on which an image is displayed and one or more TCP (tape carrier package, tape carrier package) connected to the liquid crystal display panel to transmit an electric drive signal A backlight assembly comprising a liquid crystal display panel assembly, at least one light emitting lamp for providing light to the liquid crystal display panel assembly, and a printed circuit board connected to the TCP and attached to one surface of the backlight assembly. and a shield case which surrounds a circuit board and a PCB, and alternately formed with a protrusion adjacent to one surface of the backlight assembly on a TCP connection side of the printed circuit board.

In addition, in the present invention, the TCP may pass through the protrusions and be connected to the printed circuit board.

In addition, the lamp may be positioned directly along one surface of the backlight assembly adjacent to the protrusion of the shield case.

Here, the lamp may be installed at both ends of the backlight assembly.

In addition, a screw groove is formed in the protrusion of the shield case, it is preferable that the shield case is screwed with the backlight assembly through the screw groove.

The protrusion of the shield case may be continuously formed to an end portion of the shield case which is a connection side of the TCP.

Here, the PCB may be a data PCB.

In addition, the liquid crystal display device of the present invention, a liquid crystal display panel assembly comprising a liquid crystal display panel on which an image is displayed and one or more TCP connected to the liquid crystal display panel to transmit an electric drive signal, the light to the liquid crystal display panel assembly And a shield case surrounding the printed circuit board connected to the TCP and attached to one surface of the backlight assembly, the backlight assembly including at least one light emitting lamp providing the light emitting lamp. When the cross-sectional area of the bottom part is called A and the substantial surface area of the bottom of the shield case is called B, B> A is satisfied.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5. These examples are merely to illustrate the invention, but the invention is not limited thereto.

1 is a partially exploded perspective view of a liquid crystal display device 10 according to a first embodiment of the present invention, which includes a liquid crystal display panel assembly 100, a backlight assembly 200 coupled to a mold frame 210, and a backlight assembly ( FIG. 200 is an exploded view showing the shield case 300 in close contact with the lower portion and surrounding the data TCP 135.

As shown in FIG. 1, the liquid crystal display device 10 according to the first exemplary embodiment of the present invention includes a backlight assembly 200 and a liquid crystal display panel assembly 100 positioned on an upper portion thereof to display an image. The liquid crystal display panel assembly 100 includes a gate TCP (tape carrier package) 120 and a data TCP 130 connected to the liquid crystal display panel 110 and the gate line and the data line of the liquid crystal display panel 110, respectively. Etc. The mold frame 210 is coupled to the outside of the backlight assembly 200 that provides light to the liquid crystal display panel 110.

In the liquid crystal display device 10 according to the first exemplary embodiment of the present invention, the liquid crystal display panel 110 includes a thin film transistor (TFT) substrate 150 and a color filter substrate disposed on the TFT substrate 150. 160 and a liquid crystal (not shown) injected between these substrates. In the TFT substrate 150, a thin film transistor (not shown) that performs a switching role is formed in a matrix form, a gate line is connected to a gate electrode of each thin film transistor, a data line is connected to a source electrode, and a drain electrode is formed on a TFT substrate 150. Pixel electrodes are formed.

The data line and the gate line are electrically connected to the data PCB (printed circuit board) 135 and the gate PCB 125 through the data TCP 130 and the gate TCP 120, respectively. Accordingly, when the data PCB 135 and the gate PCB 125 receive an electrical signal from the outside, the data PCB 135 and the gate PCB 125 are driven to control the driving and driving timing of the liquid crystal display panel 110. The signal and the timing signal are transmitted to the gate line and the data line through the data TCP 130 and the gate TCP 120, respectively.

The color filter substrate 160 forms an RGB pixel, which is a color pixel for displaying an image, so that light transmitted through the liquid crystal is expressed in various colors through the RGB pixel. In addition, since a common electrode is formed on the front surface of the color filter substrate 160, when a voltage is applied to the liquid crystal display panel assembly 100, an electric field is formed between the common electrode and the pixel electrode of the thin film transistor to form an array of liquid crystals located therebetween. Change.

Since the liquid crystal display panel 110 does not emit light by itself, the liquid crystal display panel 110 further includes a backlight assembly 200 for providing light to the liquid crystal display panel 110 under the liquid crystal display panel assembly 100. The backlight assembly 200 may include at least one lamp 240 for generating light (see FIG. 3 and the same below), and a light guide plate 250 for guiding the light generated from the lamp 240 to the liquid crystal display panel 110. (Shown in FIG. 3, the same below), a reflecting plate 260 (shown in FIG. 3, below) that reflects the light generated from the lamp 240, and electrically connected to the lamp 240 to supply the driving voltage. Inverter assembly (not shown) and the like.

The light guide plate 250 is positioned under the backlight assembly 200 and is accommodated in the mold frame 210 and is formed to have a size corresponding to that of the liquid crystal display panel 110. The light guide plate 250 changes the path of the light emitted from the lamp unit to display the liquid crystal display. Guide to panel 110. Various optical sheets 220 are provided on the upper part of the light guide plate 250 to make the luminance of the light directed toward the liquid crystal display panel 110 uniform. The light leaked from the light guide plate 250 is again provided on the lower part of the light guide plate 250. A reflective plate 260 is provided to reflect the liquid crystal display panel 110 to improve light efficiency.

Another mold frame (not shown) supporting a top chassis (not shown) positioned above the liquid crystal display panel assembly 100 and a bottom chassis 230 (shown in FIG. 3) supporting the backlight assembly components from below. Are combined to form a liquid crystal display module, and the liquid crystal display device 10 is formed by combining them with the front case and the rear case. In the first exemplary embodiment of the present invention, the data PCB 135 is bent with the backlight assembly 200 interposed therebetween and wrapped in the shield case 300 having the protrusion 310 formed under the backlight assembly 200. A portion of the side opposite the formation of the protrusion 310 of the shield case 300 is opened to allow the data PCB 135 to be connected to other components such as a power source.

In the first exemplary embodiment of the present invention, the data PCB 135 is bent to be wrapped and protected by the shield case 300, but this is merely to illustrate the present invention and the present invention is not limited thereto. Therefore, the present invention can also be applied to the gate PCB 125 and the like.

FIG. 2 is a view illustrating a liquid crystal display device 10 according to the first exemplary embodiment of FIG. 1 rotated by 180 ° with respect to the Y axis, and includes a liquid crystal display panel assembly 100 and a backlight assembly 200. After the combination, a diagram showing a state of covering the shield case 300 on the bent data PCB (135).

In the first embodiment of the present invention shown in FIG. 2, the shield case 300 includes a plurality of protrusions 310 adjacent to one surface of the backlight assembly 200 on the data TCP 130 connection side of the data PCB 135. It is formed alternately. Here, the protrusion 310 may be continuously formed to the end of the shield case 300 to the data TCP (130) connection side. In addition, the data TCP 130 passes between the protrusions 310 and is connected to the data PCB 135 closely attached to the bottom chassis 230 at the bottom of the backlight assembly 200. The heat dissipation effect due to such a structure will be described with reference to FIG. 3.

3 is a cross-sectional view taken along line AA after coupling the shield case 300 to the backlight assembly 200 in FIG. 2, schematically illustrating a process in which heat generated from a lamp is discharged to the outside through the shield case 300. It is a figure which shows. As shown in FIG. 3, the protrusion 310 of the shield case 300 is in close contact with one surface of the backlight assembly, that is, the bottom chassis 230, and is adjacent to the protrusion 310 of the shield case 300. At least one lamp 240 is installed directly on one surface of the assembly. Therefore, the heat generated from the lamp 240 and then conducted through the lamp cover 270 and the bottom chassis 230 may be easily discharged to the outside. In addition, since the data TCP 130 passes between the protrusions 310 of the shield case 300 and is connected to the data PCB 135, the data PCB 135 is not positioned directly above the lamp 240 so that the space is spared. Heat dissipation is easier.

As shown in FIG. 3, in particular, the present invention can dissipate heat more easily in the case of an edge type in which lamps are positioned at both ends of the backlight assembly.

FIG. 4 is a perspective view schematically illustrating a lower surface of the liquid crystal display device 20 according to the second embodiment of the present invention. The liquid crystal display device 20 in which the shield case 400 having the protrusion 410 of another shape is combined is shown. Indicates. Since the liquid crystal display device 20 according to the second exemplary embodiment of the present invention is the same as the first exemplary embodiment of the present invention except for the shield case 400, the description of the same parts is omitted, and the same components are the same. It is shown with reference numeral.

In FIG. 4, the backlight assembly and the shield case 400 are adjacent to each other by forming a protrusion 410 having a circular cross section by embossing the shield case 400 on the connection side of the data TCP 130 by pressing or the like. Let's do it. Here, the cross-sectional shape of the protrusion 410 is merely for illustrating the present invention, the present invention is not limited thereto. On the data TCP 130 connection side, when the cross-sectional area of the bottom of the shield case 400 is A, and the substantial surface area of the bottom of the shield case 400 is B, B is larger than A.

FIG. 5 is a perspective view schematically illustrating a lower surface of the liquid crystal display device 30 according to the third embodiment of the present invention, and includes a liquid crystal display device in which a shield case 500 in which a protrusion 510 having a screw groove is formed is coupled ( 30). Since the liquid crystal display device 30 according to the third exemplary embodiment of the present invention is the same as the first exemplary embodiment of the present invention except for the shield case 500, a description of the same parts is omitted, and the same components are the same. It is shown with reference numeral.

In the third embodiment of the present invention shown in FIG. 5, the shield case 500 is more firmly secured by combining the shield case 500 and the backlight assembly 200 through the screw groove with the screw 520. To be attached to the Therefore, the heat generated from the lamp can be easily discharged to the outside to improve the display quality of the liquid crystal display device 30.

As described above, the liquid crystal display of the present invention includes a shield case in which protrusions adjacent to one surface of the backlight assembly are alternately formed on the TCP connection side of the printed circuit board, thereby easily dissipating heat generated from the lamp to the outside. have.

In addition, since the TCP passes through the protrusions and is connected to the printed circuit board, the printed circuit board is not positioned directly above the lamp, thereby more easily dissipating heat, thereby preventing deterioration of the liquid crystal.

In addition, since a lamp is positioned directly under one surface of the backlight assembly adjacent to the protrusion of the shield case, heat can be easily emitted in a vertical direction, thereby improving display quality of the LCD.

On the other hand, the liquid crystal display device of the present invention is more suitable for the case where the lamp is an edge type located at both ends of the backlight assembly.

In the liquid crystal display of the present invention, since the shield case and the backlight assembly are coupled to each other through a screw groove formed in the protrusion of the shield case, heat dissipation can be easily achieved by increasing the adhesion between the two.

In the liquid crystal display of the present invention, since the protrusion of the shield case may be continuously formed up to the end of the shield case, which is a connection side of the TCP, precision processing is not required separately, and thus the processing is easy.

In the liquid crystal display of the present invention, the cross-sectional area of the bottom portion of the shield case is A and the substantial surface area of the bottom portion of the shield case is B, which satisfies B > .

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 another exploded perspective view of a liquid crystal display according to a first exemplary embodiment of the present invention.

3 is a schematic cross-sectional view of a liquid crystal display showing a process of emitting heat from a lamp according to a first embodiment of the present invention.

4 is a perspective view of a liquid crystal display according to a second exemplary embodiment of the present invention.

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

Claims (8)

A liquid crystal display panel assembly including a liquid crystal display panel on which an image is displayed, and one or more TCPs (tape carrier packages) connected to the liquid crystal display panels to transmit electric driving signals; A backlight assembly comprising at least one light emitting lamp for providing light to the liquid crystal display panel assembly, and A shield case which is connected to the TCP and surrounds a printed circuit board (PCB) attached to one surface of the backlight assembly, and alternately formed with protrusions adjacent to one surface of the backlight assembly on the TCP connection side of the printed circuit board. (shield case) Liquid crystal display comprising a. The method of claim 1, And a TCP passing through the protrusions to be connected to the printed circuit board. The method of claim 1, And a lamp positioned directly on one surface of the backlight assembly adjacent to the protrusion of the shield case. The method of claim 1, And the lamps are provided at both ends of the backlight assembly. The method of claim 1, And a screw groove is formed in the protrusion of the shield case, and the shield case is screwed to the backlight assembly through the screw groove. The method of claim 1, And the protrusion of the shield case is continuously formed to an end portion of the shield case which is a connection side of the TCP. The method of claim 1, The PCB is a liquid crystal display device data PCB. A liquid crystal display panel assembly including a liquid crystal display panel on which an image is displayed, and at least one TCP connected to the liquid crystal display panel to transmit an electric driving signal; A backlight assembly comprising at least one light emitting lamp for providing light to the liquid crystal display panel assembly; A shield case connected to the TCP to surround a printed circuit board attached to one surface of the backlight assembly Including, The liquid crystal display satisfying B> A in the TCP connection side, when a cross sectional area of the bottom of the shield case is A and a substantial surface area of the bottom of the shield case is B.