KR20030064128A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display is provided to prevent an inverter assembly from being easily separated from an outer surface of a liquid crystal display module even if external vibration or shock is applied to the liquid crystal display. CONSTITUTION: A back light assembly generates light. A display unit(140) receives the light from the back light assembly for displaying an image. A mold frame is provided to contain the back light assembly and the display unit. A top chassis(170) is combined with the mold frame and fixes the display unit at the mold frame. An inverter assembly(300) is combined with a side of the top chassis through screws(400) and converts power supply input from the outside into power supply necessary for driving a lamp. The inverter assembly includes an inverter board(210) and a bracket(220) for fixing the inverter board.

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 having an inverter fixing structure for backlight having improved mechanical reliability.

Recently, due to the rapid development of technology in the semiconductor industry, display products with smaller and lighter weight and more powerful performances are being produced.

Among such display products, the liquid crystal display device, which is widely spotlighted recently, has been attracting attention as an alternative means of overcoming the shortcomings of the CRT due to its advantages such as miniaturization, light weight, and low power consumption. It is installed in almost all information processing equipment that needs a.

In general, a liquid crystal display (LCD) applies a voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and the birefringence, photoluminescence, dichroism, and light scattering characteristics of the liquid crystal cell that emit light by the molecular arrangement. It is a display device which displays information using the modulation of the light by a liquid crystal cell by converting a change of optical properties, such as a visual change.

In recent years, active research and development has been carried out on an active matrix liquid crystal display device that individually applies driving signals to all pixels constituting the screen in order to meet the demand for increasing display information and increasing display area. It's going on.

As such, thin film transistor LCDs (TFT-LCDs) using thin film transistors as active matrix switching elements can be applied to large area glass substrates by low temperature processes, and can be sufficiently driven even at low voltages. It has the advantage of being the most widely used today.

In such a TFT liquid crystal display device, a backlight inverter particularly receives a DC voltage to turn on the backlight of the liquid crystal display panel, converts the AC voltage into AC voltage, and boosts the converted AC voltage to several hundred volts. It is used to operate a cold cathode tube which is a backlight of a display panel.

1 is a diagram schematically illustrating a coupling structure of a backlight inverter included in a conventional liquid crystal display device.

As shown in the drawing, the liquid crystal display device 30 is mounted on the outer surface of the liquid crystal display module 10 and the liquid crystal display module 10 for displaying an image by a signal provided from the outside, and receives input power from the outside of the lamp. Inverter assembly 20 to convert the current to a suitable drive.

The inverter assembly 20 converts DC power input from the outside into AC power suitable for driving the lamp 14 and supplies the same to the liquid crystal display module 10. The inverter assembly 20 includes an inverter board 22 and a fixing bracket 24 for fixing the inverter board 22 to the outer surface of the liquid crystal display module 10.

The inverter board 22 is fixed to one end of the fixing bracket 24 by a predetermined fastening means such as a bolt, and the other end of the fixing bracket 24 is in close contact with the outer surface of the liquid crystal display module 10. It is bent so as to be attached to the rear surface of the liquid crystal display module 10 by a double-sided tape 26 made of a conductive material.

On the other hand, a grounding tape 16 made of a conductive material such as aluminum is attached to a portion from the top surface of the top chassis 12 to the fixing bracket 24 for grounding of the fixing bracket 24. .

However, in the conventional liquid crystal display device 30, when the inverter assembly 20 is coupled to the outer surface of the liquid crystal display module 10, the fixing bracket 24 uses the double-sided tape 26 to form the liquid crystal display module. Since it adheres to the back surface of (10), structurally robust attachment reliability cannot be expected.

Accordingly, when vibration or shock is applied to the liquid crystal display device 30, the inverter assembly 20 may be easily separated from the liquid crystal display module 10, and in case of reworking the liquid crystal display device 10 in case of need. , Due to the deterioration of the adhesive strength of the double-sided tape 26, there was a problem that the inverter assembly 20 must be replaced and used again.

Accordingly, an object of the present invention is to provide a liquid crystal display device having an improved inverter fixing structure for fixing the inverter assembly to the liquid crystal display module mechanically and firmly. .

1 is a partial perspective view schematically illustrating a conventional liquid crystal display.

2 is a diagram illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a cross-sectional structure of an AA ′ section direction of the liquid crystal display illustrated in FIG. 2.

4 is a cross-sectional view illustrating another embodiment of a liquid crystal display according to the present invention.

5 is a cross-sectional view illustrating another embodiment of a liquid crystal display according to the present invention.

Explanation of symbols on the main parts of the drawings

100: liquid crystal display module 102: lamp

120 backlight assembly 130 liquid crystal display panel

140: display unit 150: mold frame

152: fastening groove 162: through hole

170: top chassis 172: coupling holes

174: through hole 210: inverter board

220: fixing bracket 230: fastening hole

300: inverter assembly 400: screw

According to an aspect of the present invention, a liquid crystal display device includes: a backlight assembly for generating light; A display unit for receiving an image from the backlight assembly to display an image; A mold frame for receiving the backlight assembly and the display unit; A top chassis coupled to the mold frame and configured to fix the display unit to the mold frame; And an inverter assembly coupled to a side portion of the top chassis through a screw and converting power input from the outside into power in a form required for driving the lamp.

The inverter assembly is fixed to the inverter board having an inverter for converting the DC power input from the outside into the AC power required for driving the lamp and the inverter board, for fixing to couple the inverter board to the side of the top chassis Include the bracket.

At this time, one surface of the fixing bracket is formed with a plurality of fastening holes for fastening the screw, the fixing bracket is fixed to the side of the top chassis through the screw through the fastening hole.

A coupling hole protruding from the side surface to the mold frame side is formed in the side surface of the top chassis, and the fixing bracket is fastened to the coupling hole through the screw through the coupling hole.

As such, the inverter assembly may form a coupling hole corresponding to the fastening hole only in the top chassis itself, thereby allowing the screw to penetrate the fastening hole to be firmly coupled to the coupling hole.

On the other hand, the inverter assembly can be fixed on the side of the top chassis by forming a predetermined hole for coupling with the screw in the top chassis and the mold frame.

That is, the side of the top chassis is formed with a through hole through which the screw to fix the fixing bracket to the side of the top chassis corresponding to the fastening hole.

In addition, an insert having a fastening groove for coupling with the screw is installed on the sidewall of the mold frame to correspond to the fastening hole and the through hole, and the fixing bracket has the screw passing through the fastening hole and the through hole. It is fixed to the side portion of the top chassis by being coupled to the fastening groove.

The liquid crystal display may further include a back cover coupled between the mold frame and the top chassis to increase heat dissipation efficiency to the outside of the lamp housed in the mold frame.

At this time, one surface of the back cover is formed with a through hole through which the screw corresponds to the fastening hole.

According to the present invention, the fixing bracket can be securely fixed on the outer surface of the top chassis by the screw, so that the inverter assembly can be mounted on the top chassis even when vibration or shock is applied to the liquid crystal display device from the outside. It can be prevented from detaching easily from the outer surface.

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

FIG. 2 is a partial perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 3 is a partial cross-sectional view illustrating a cross-sectional structure in the AA ′ section direction of the liquid crystal display illustrated in FIG. 2.

2 and 3, the liquid crystal display device 500 according to the present invention receives a picture signal from the outside and displays a screen with a liquid crystal display module 100 and an external input power supply having a form suitable for driving a lamp. The inverter assembly 300 is fixed to the outer surface of the liquid crystal display module 100.

The liquid crystal display module 100 includes a backlight assembly 120 for generating light and a display unit 140 for displaying an image by receiving the light.

In addition, the liquid crystal display module 100 covers the mold frame 150 for accommodating the display unit 140 and the backlight assembly 120, and an upper surface of the display unit 140 and the mold frame 150. It includes a top chassis 170 that is coupled to the opposite.

The display unit 140 includes a liquid crystal display panel 130. The liquid crystal display panel 130 includes a thin film transistor substrate, a color filter substrate, and a liquid crystal (not shown).

The thin film transistor substrate is a transparent glass substrate on which a thin film transistor in a matrix is formed. A data line is connected to a source terminal of the thin film transistors, and a gate line is connected to a gate terminal.

In addition, a pixel electrode made of indium tin oxide (ITO), which is a transparent conductive material, is formed in the drain terminal.

Accordingly, when an electrical signal is applied to the data line and the gate line, an electrical signal is input to the source terminal and the gate terminal of each thin film transistor.

Subsequently, the thin film transistor is turned on or turned off according to the input of these electrical signals, and an electrical signal necessary for pixel formation is output to the drain terminal.

On the other hand, a color filter substrate is provided to face the thin film transistor substrate.

The color filter substrate is a substrate in which a color pixel in which a predetermined color is expressed while light passes is formed by a thin film process.

When power is applied to the gate terminal and the source terminal of the transistor of the thin film transistor substrate described above 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.

The arrangement angle of the liquid crystal injected between the thin film transistor substrate and the color filter substrate is changed by the electric field thus formed, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel.

Meanwhile, a backlight assembly 120 is provided below the display unit 140 to provide uniform light to the display unit 140.

The backlight assembly 120 may include a lamp unit, a light guide plate 112, a reflector plate 114, and an optical sheet 116.

The lamp unit includes a lamp 102 for generating light and a lamp cover 104 for reflecting the light emitted from the lamp 102 to the side of the light guide plate 112.

Here, a cold cathode tube is mainly used as the lamp 102, and the light generated from the lamp 102 is incident on the side surface of the light guide plate 112.

In addition, the lamp cover 104 surrounds the lamp 102 and reflects the light generated from the lamp 102 back to the light guide plate 112 to improve the efficiency of the light.

The light guide plate 112 has a size corresponding to that of the liquid crystal display panel 130 and changes the path of the light while guiding the light generated from the lamp 102 toward the liquid crystal display panel 130.

The light guide plate 112 is formed of a plastic-based transparent material such as acrylic to form a panel having an inclined lower surface and a horizontal upper surface.

Here, the light guide plate 112 may be formed to have a wedge shape in which the thickness increases or decreases from one side to the other side, and when the lamp unit 110 is provided at both sides of the light guide plate 112, the thickness is uniform. It may be formed in one plane shape.

In addition, a dot pattern (not shown) is arranged and printed at a predetermined interval on the lower surface of the light guide plate 112. Accordingly, the light generated from the lamp unit 110 is reflected by the printed dot pattern to proceed to the upper side of the light guide plate 112.

Below the light guide plate 112, a reflector plate 114 is provided to reflect light that is not reflected through the dot pattern of the light guide plate 112 and leaks to the light guide plate 112 to increase the efficiency of light.

An optical sheet 116 is provided on the light guide plate 112 to uniformly emit light emitted from the light guide plate 112 and directed toward the liquid crystal display panel 130.

Accordingly, the light reflected by the dot pattern of the light guide plate 112 and the reflecting plate 114 travels toward the liquid crystal display panel 130 in the form of a certain angle range with respect to the horizontal plane of the light guide plate 112.

An optical sheet 116 that spreads the light beam distribution of the light incident from the light guide plate 112 uniformly on the light guide plate 112 and condenses the diffused light in a direction perpendicular to the plane of the light guide plate 112. ) Is provided.

Meanwhile, the display unit 140 and the backlight assembly 120 are wrapped in the mold frame 150 and are fixed to not flow.

The mold frame 150 is made of a synthetic resin material having a box shape of a rectangular parallelepiped having an upper surface and a lower surface thereof.

The outer side of the mold frame 150 is coupled to the top chassis 170 which covers the top edge of the display unit 140 and surrounds the top and side portions of the mold frame 150.

The top chassis 170 has a rectangular parallelepiped shape like the mold frame 150, and an upper surface portion is opened to expose the liquid crystal display panel 130, and a sidewall portion is bent in an inner vertical direction to form the mold frame 150. It is in close contact with the outer surface.

In addition, the top of the top chassis 170 corresponds to a plurality of fastening holes 230 formed in the fixing bracket 220 of the inverter assembly 300, which will be described later, and the top of the screw 400 will be described later. A coupling hole 172 extending from the side surface of the chassis 170 to the mold frame 150 side is formed.

On the other hand, the inverter assembly 300 is coupled to one side of the outer surface of the liquid crystal display module 100. The inverter assembly 300 has an inverter board 210 having an inverter for converting power input from the outside into a voltage suitable for driving the lamp 102 and a fixing bracket 220 for fixing the inverter board 210. It includes.

The inverter board 210 receives a DC voltage from the outside and converts it into an AC voltage, and boosts the converted AC voltage to several hundred volts to turn on the lamp 102.

In addition, the inverter board 210 is coupled to one surface of the fixing bracket 220 by a predetermined coupling means such as a bolt. The fixing bracket 220 is made of a metal material bent in a substantially "a" shape, the inverter board 210 is fixed to the side of the top chassis 170 through the fixing bracket 220.

The other surface of the fixing bracket 220 corresponds to the coupling hole 172 of the top chassis 170, a plurality of fastening holes 230 for coupling the screw 400 is formed.

Accordingly, the inverter assembly 300 including the inverter board 210 penetrates the screw 400 through the fastening hole 230 of the fixing bracket 220 to engage the coupling hole of the top chassis 170 ( 172 is fixed to the outer surface of the liquid crystal display module 100.

As described above, the assembly 300 fixed on the liquid crystal display module 100 by the screw 400 is different from the conventional double-sided tape, so that the fixing structure is very structurally strong. Vibration or shock is not easily separated from the liquid crystal display module 100.

In addition, since the fixing bracket 220 of the inverter assembly 300 is in direct contact with the top chassis 170, a sufficient grounding effect may be obtained without a separate grounding means.

In the liquid crystal display device 500 having the above structure, the fastening holes 230 and the coupling holes 172 are formed in the fixing bracket 220 and the top chassis 170, respectively, when the inverter assembly 300 is fixed. The structure for fixing to the side of the top chassis 170 through the screw 400 is deployed.

However, the liquid crystal display 500 according to the present invention may be used by fixing the inverter assembly 300 to the side of the liquid crystal display module 100 as in the case of other embodiments described later.

4 is a partial cross-sectional view showing a fixing structure of the inverter assembly according to another embodiment of the present invention.

Referring to FIG. 4, a through part 174 is formed at a side surface of the top chassis 170 to correspond to a plurality of fastening holes 230 of the fixing bracket 220.

In addition, a fastening groove 152 to which the screw 400 is coupled is formed on the sidewall of the mold frame 150 to correspond to the fastening hole 230 and the through hole 174.

Accordingly, the fixing bracket 220 is coupled to the fastening groove 152 through the fastening hole 230 and the through hole 174 to be coupled to the fastening groove 152 on the side surface of the top chassis 170. Is fixed to.

By such a coupling structure, the inverter assembly 300 may be firmly fixed on the side surface of the liquid crystal display module 100.

5 is a cross-sectional view illustrating a fixing structure of the inverter assembly 300 in the liquid crystal display module 100 equipped with a back cover as another embodiment of the present invention.

Referring to FIG. 5, the outer surface of the mold frame 150 protects the lamp 102 stored in the mold frame 150 and emits heat emitted from the lamp 102 to the outside of the liquid crystal display module 100. To back cover 160 is coupled.

Specifically, the back cover 160 is made of a conductive material bent in a '-' shape, is in close contact with the back and side of the mold frame 150 is coupled.

The back cover 160 reduces the static electricity and harmful electromagnetic waves (EMI) generated by the liquid crystal display panel 130, the optical sheet 116, the light guide plate 112 and the reflector 114, and at the same time the lamp 102 The heat generated from the mold frame 150 may be easily discharged to the outside of the mold frame 150 to prevent excessive accumulation of heat in the liquid crystal display module 100.

On the other hand, the side of the top chassis 170 as shown in FIG. 4 has a through hole 174 for fastening the screw 400 corresponding to the plurality of fastening holes 230 of the fixing bracket 220 Formed. In addition, a fastening groove 152 to which the screw 400 is coupled is formed at a sidewall of the mold frame 150 to correspond to the fastening hole 230 and the through hole 174.

On one surface of the back cover 160, the coupling groove 152 of the mold frame 150 and the through hole 174 of the top chassis 170, and the fixing bracket for coupling the screw 400 The through hole 162 corresponding to the fastening hole 230 of the 220 is formed.

Accordingly, the fixing bracket 220 is inserted into the screw 400 through the fastening hole 230, the through hole 174, and the through hole 162 to fasten the groove 152 of the mold frame 150. ) Is fixed on the side of the top chassis 170.

By such a coupling structure, the inverter assembly 300 may be coupled to have a more rigid structure mechanically on the side surface of the liquid crystal display module 100.

According to the present invention having the above-described configuration, the inverter assembly can be fixed with better reliability mechanically, so that the inverter assembly can be easily separated from the outer surface of the liquid crystal display module even when external vibrations or shocks are applied to the liquid crystal display device. Can be prevented.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.

Claims (7)

A backlight assembly for generating light; A display unit for receiving an image from the backlight assembly to display an image; A mold frame for receiving the backlight assembly and the display unit; A top chassis coupled to the mold frame and configured to fix the display unit to the mold frame; And And an inverter assembly coupled to a side portion of the top chassis through a screw, and configured to convert power input from the outside into power of a type necessary for driving the lamp. According to claim 1, The inverter assembly is fixed to the inverter board and the inverter board having an inverter for converting the DC power input from the outside to the AC power required for driving the lamp, and the inverter board side portion of the top chassis Liquid crystal display comprising a fixing bracket for coupling to. 3. The liquid crystal display of claim 2, wherein the fixing bracket has a plurality of fastening holes formed on one surface thereof for fastening the screw, and fixed to the side surface of the top chassis through the screw. According to claim 3, The side of the top chassis is formed with a coupling hole protruding from the side to the mold frame side corresponding to the fastening hole is formed, wherein the screw is fastened to the coupling hole through the fastening hole A liquid crystal display device characterized by the above-mentioned. 4. The liquid crystal display of claim 3, wherein a hole through which the screw penetrates is formed on a side of the top chassis to fix the fixing bracket to the side of the top chassis in response to the fastening hole. 5. The method according to claim 5, wherein the insert is formed in the side wall of the mold frame is formed with a fastening groove for coupling with the screw corresponding to the fastening hole and the through hole, the fixing bracket is the screw is the fastening hole and the The liquid crystal display device of claim 1, wherein the liquid crystal display is fixed to the side surface of the top chassis by being coupled to the fastening groove through the through part. The apparatus of claim 4 or 6, further comprising a back cover coupled between the mold frame and the top chassis to increase heat dissipation efficiency to the outside of the lamp housed in the mold frame. And a through hole through which the screw penetrates corresponding to the fastening hole.