KR20080053978A - Liquid Crystal Display and Assembly Method - Google Patents

Abstract

The present invention relates to a top chassis and a liquid crystal display having the same, which reduces a defect rate of a product and improves reliability.

The liquid crystal display according to the present invention includes a display panel for displaying an image, a backlight unit for generating light, a mold frame for accommodating the display panel, a bottom chassis for fixing the backlight unit, and the mold frame, and a bottom chassis for the display panel. And a top chassis for fixing the mold frame and the backlight unit and the display panel, and reinforcing means for coupling the top chassis and the mold frame.

Description

Liquid crystal display device and its assembly method {LIQUID CRYSTAL DISPLAY PANEL AND ASSEMBLEY METHOD THEREOF}

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

FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

3A to 3D illustrate a method of assembling a liquid crystal display and a top chassis according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: liquid crystal display 110: fastening member

115: top chassis 120: color filter substrate

125: thin film transistor substrate 130: liquid crystal display panel

135: TCP 140: driver IC

145: printed circuit board 150: drive circuit portion

155: protective sheet 160: prism sheet

165: diffusion sheet 170: light emitting diode

175: drive circuit board 180: heat sink

185: lamp unit 190: light guide plate

195: reflective sheet 200: backlight unit

205: bottom chassis 210: mold frame

215: insertion hole 220: fixing projection

225: jamming jaw

 The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a top chassis with improved coupling reliability of the device and a method of assembling thereof.

       Due to technological advances in the semiconductor industry, products with smaller and slimmer performance are being produced. Until now, CRT (Cathode Ray Tube) has been used a lot in terms of performance and price, but there are many disadvantages in terms of miniaturization or portability.

       Recently, liquid crystal display devices are being used as an alternative means to overcome the shortcomings of CRT due to the advantages of low price, small size, light weight, thinness, and low power consumption.

      In general, a liquid crystal display device is a liquid crystal display having intermediate characteristics between liquid and solid, and the liquid crystal has an electrical property such that the arrangement of liquid crystal molecules is changed by an external electric field. It is made.

In recent years, in order to satisfy the purpose of light and short reduction of the liquid crystal display device, continuous researches have been conducted on the respective members constituting the liquid crystal display device, such as a backlight, a connector, a printed circuit board (PCB), or a coupling structure. It is a trend.

As described above, the liquid crystal display includes a liquid crystal display panel for largely displaying an image signal, a backlight unit for irradiating light to the liquid crystal display panel, and a chassis for preventing and fixing the flow of the liquid crystal display panel and the backlight unit. Include.

The chassis includes a top chassis that opposes and combines a bottom chassis that accommodates a liquid crystal display panel and a backlight unit.

The chassis functions to surround and protect the exterior of the liquid crystal display panel and the backlight unit in order to prevent damage caused by external shock. And when using a top chassis or a stainless top chassis formed of aluminum to reduce the weight and thickness, there is a problem that the thin top chassis is bent or lifted when handling the operator carelessness and the mold. In addition, in the reliability test, such as external impact or dropping of the box, there is a problem in that appearance defects occur in light leaking from the top chassis or peeling off the top chassis fastened to the mold.

Accordingly, the technical problem to be achieved by the present invention is to provide a liquid crystal display device and a method for assembling the same by providing a coupling reinforcement means in the top chassis to prevent deformation of the top chassis when assembling the top chassis and the mold frame, and at the same time having a rigid coupling structure. There is a purpose.

In order to achieve the above technical problem, a liquid crystal display according to the present invention includes a display panel displaying an image, a backlight unit for generating light, a mold frame for accommodating the display panel, and fixing the backlight unit and the mold frame. And a top chassis coupled to the bottom chassis and the bottom chassis, the top chassis for fixing the mold frame, the backlight unit, and the display panel, and reinforcing means for coupling the top chassis and the mold frame.

In addition, the reinforcing means is preferably located in the mold frame and the top chassis overlapping the lamp unit.

The reinforcing means may include a fastening member disposed on an upper surface of the top chassis, an insertion hole formed in a mold frame corresponding to the fastening member, and a fixing protrusion formed on one side of the insertion hole.

The fastening member may have a shape of 'c' and bend to be formed under the top chassis.

It is preferable that the inlet of one side of the insertion hole is stepped.

The fixing protrusion is formed to protrude out of the mold frame and one end overlaps with a portion of the insertion hole.

In order to achieve the above technical problem, the assembling method of the liquid crystal display device according to the present invention has a top chassis having a fastening member and a locking jaw and a stepped insertion hole to insert the fastening member, and a fixing protrusion for supporting the fastening member is formed. The step of preparing a mold frame, the top chassis and the mold frame to face each other, the fastening member of the aligned top chassis is seated in the insertion hole so that the lower surface of the fixing projections of the mold frame and the locking jaw to the mold frame Fixing the lower surface and the fastening member is pushed toward the lower side of the fixing projections characterized in that it comprises the step of coupling the top chassis and the mold frame.

Other technical problems and advantages of the present invention in addition to the above technical problem will be apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3D.

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

Referring to FIG. 1, the liquid crystal display device 100 includes a liquid crystal display panel 130, a driving circuit unit 150, a backlight unit 200, a mold frame 210, and a bottom chassis for displaying an image by applying an image signal. 205, top chassis 115, and the case (not shown) in the front and rear.

The liquid crystal display panel 130 includes a thin film transistor substrate 120 and a color filter substrate 120 facing the thin film transistor substrate 120. Liquid crystal is injected between the thin film transistor substrate 120 and the color filter substrate 120, and the information is displayed by controlling the light transmittance of the liquid crystal using a thin film transistor formed in a matrix form as a switching element.

A gate line is connected to a gate electrode of a thin film transistor (not shown), a data line is connected to a source electrode, and a pixel electrode made of indium tin oxide (ITO), which is a transparent conductive material, is connected to a drain electrode. Therefore, the light transmitted through the liquid crystal is expressed in a predetermined color through each pixel to implement an image.

Three color filters, RED, GREEN, and BLUE, are formed on the color filter substrate 120 to implement colors. Accordingly, the light transmitted through the liquid crystal is expressed in a predetermined color through a color filter having red, green, and blue colors to implement an image.

The driving circuit 150 may include a gate drive integrated circuit (IC) 140 for driving gate lines of the liquid crystal display panel 130 and a data drive IC for driving data lines of the liquid crystal display panel 130. And a timing control unit, a power supply unit, and various circuit elements, and generate various signals necessary to implement an image. The timing control unit, the power supply unit, and various circuit elements are attached to the printed circuit board (PCB) 145.

Various signal circuits on the gate printed circuit board and the data printed circuit board are electrically connected to the data line and the gate line through a gate tape carrier package (TCP) 135 and a data tape carrier package (TCP) 135. The power supply unit and the timing controller mounted on the printed circuit board 145 receive an electrical signal from the outside. Here, the timing controller and the power supply unit generate gate control signals and power signals using various electrical signals from the outside.

The power supply unit supplies power for the gate drive IC, the data drive IC, and the timing controller. The power supply unit is connected to the gate drive IC 140 and the data drive IC through the TCP 135 and generates a driving voltage for driving the liquid crystal display panel 130 using a power signal from the outside.

The backlight unit 200 protects the surfaces of the lamp unit 39, the reflective sheet 195, the light guide plate 190, the diffusion sheet 165, the prism sheet 160 and the prism sheet 160 that collect the diffused light. It consists of sheets, such as the protective sheet 155, and provides light to the liquid crystal display panel 130. FIG.

The lamp unit 39 is composed of a light emitting diode 25, a driving substrate 27, and a heat sink 29.

The light emitting diode (LED) 170 is composed of a high brightness light emitting diode emitting light with a sufficiently high light quantity than a general light emitting diode, and many of the light emitting diodes 170 are mounted on the driving circuit board 175. Therefore, the light emitting diode 170 receives power from an external power source through the driving circuit board 175 to generate light.

In the driving circuit board 175, a plurality of driving signal lines are formed to apply driving power to the light emitting diodes 170 arranged in a predetermined form, and a column of the light emitting diodes 170 mounted on the driving circuit board 175 is formed. Located on the heat sink 180 to dissipate heat.

The heat sink 180 is made of a metal material having high thermal conductivity, so that the high temperature heat generated when driving the light emitting diode 170 is emitted to the outside, thereby improving light efficiency.

The reflective sheet 195 serves to prevent external emission of light by reflecting light emitted from the lamp unit 185 to the light guide plate 190 and exiting to the upper side.

Therefore, a material having high reflectance is coated on the base material. That is, Ag, Ti, etc. are mainly coated as a reflective member on base materials such as stainless steel (SUS), brass, aluminum, and polyethylene terephthalate (PET). The reflective sheet 195 returns the light emitted under the light guide plate 190 back to the light guide plate 190. In addition, the reflective sheet 195 may be slightly thicker so that deformation does not occur due to strong heat generated from the light emitting diode 170.

The light guide plate 190 is for uniformly transmitting the light from the lamp to the screen display area. A transparent acrylic material having a thickness of about several millimeters is formed, and a plurality of dots or V-shaped grooves are formed on the lower surface for uniform reflection of light. It is. The light guide plate 190 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 light emitting diode 170 toward the liquid crystal display panel 130. As the distance from the light source increases, there is an inclined type in which the thickness of the light guide plate 190 becomes thin and a flat type without a change in thickness.

The diffusion sheet 165 and the prism sheet 160 may be properly combined with two or three sheets to diffuse or condense the light guided from the light guide plate 190 to improve brightness or improve a viewing angle.

The protective sheet 155 may be installed on the diffusion sheet 165 or the prism sheet 160 to protect sheets sensitive to dust or scratches and to prevent the flow of the sheets when only the backlight unit 200 is transported. In addition, the viewing angle narrowed by the prism sheet 160 may be widened.

The mold frame 210 provides a space for accommodating the liquid crystal display panel 130, and has a rectangular frame having an insertion hole 215 and a fixing protrusion 220 on the upper surface for coupling with the top chassis 115. Is done. In addition, like the top chassis 115, the mold frame 210 may fix the liquid crystal display panel 130 to prevent the liquid crystal display panel 130 from flowing. Such, the mold frame 210 is inserted into the top chassis 115 is fastened and is preferably formed of a plastic material.

The bottom chassis 205 provides a space for storing the backlight unit 200, the mold frame 210, and the like. The bottom chassis 205 is fastened to the top chassis 115 and is a means for protecting when a force from the outside is applied. The bottom chassis 205 may be made of synthetic resin, plastic, or the like so as to advantageously insulate the driving circuit unit 150.

The top chassis 115 has a shape similar to that of the bottom chassis 205, and an upper portion thereof is opened to expose the liquid crystal display panel 130, and a side portion thereof is bent in an inner vertical direction to contact the outer surface of the bottom chassis 205. It is.

The upper surface of the top chassis 115 covers the upper edge of the liquid crystal display panel 130, and the front / rear side and the left / right side cover the opposing bottom chassis 205 and cover a plurality of fastenings. Means are formed. In addition, a fastening member 110 for firmly coupling the mold frame 210 is formed on the upper surface of the top chassis 115 overlapping the lamp unit 185.

FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

Referring to FIG. 2, the reinforcing members of the top chassis 115 and the mold frame 210 according to the present invention are fastening members 110 and a locking jaw located at the side of the top chassis 115 located at the top of the top chassis 115. There is a 225, the fixing hole 220 of the mold frame for supporting the fastening member 110 on the insertion hole 215 and the insertion hole 215 to insert the fastening member 110 is formed.

The fastening members 110 are formed to be spaced apart from each other on the upper surface of the top chassis 115 overlapping the lamp unit 185. The fastening member 110 is cut in a 'c' shape and the fastening member 110 cut is formed to be bent under the top chassis 115. The bent fastening member 110 is seated in the insertion hole 215 of the mold frame and is fixed in combination with the fixing protrusion 220 formed to cover the insertion hole 215 of the mold frame 210 halfway.

The locking jaw 225 is located on both sides of the top chassis 115 in the long side direction. The locking jaw 225 has a corner portion where an upper surface and a side surface of the top chassis 115 meet, and is cut in a 'c' shape at the lower portion of the top chassis 115, and is inclined inside the top chassis 115. Therefore, the locking jaw 225 supports the lower surface of the mold frame 210, so that the top chassis 115 and the mold frame 210 are doubled.

The insertion hole 215 is formed so that the fastening member 110 is inserted to correspond to the fastening member 110 on the upper part of the mold frame 210, and the inlet portion of the other end where the fixing protrusion 220 is formed is a fastening member 110. As stepped, it is formed stepped.

The fixing protrusion 220 is integrally formed with the mold frame 210 at the opposite side of the stepped insertion hole 215, protrudes out of the mold frame 210, and partially overlaps with the insertion hole 215 to fasten the fastening member. It will support the tip of (110). Therefore, the fastening member 110 is inserted into the lower end of the fixing protrusion 220 to be seated and fixed, thereby supporting the fastening member 110 to prevent the lifting of the top chassis 115 to achieve a firm coupling.

3A to 3D illustrate a method of assembling a liquid crystal display and a top chassis according to an exemplary embodiment of the present invention.

First, as shown in FIG. 3A, the top chassis 115 having the fastening member 110 and the locking jaw 225 and the stepped insertion hole 215 are inserted such that the fastening member 110 is inserted to fix the top chassis 115. And a mold frame 210 having a fixing protrusion 220 for supporting the fastening member 110.

Then, the top chassis 115 is aligned on the upper side of the mold frame 210 such that the top chassis 115 and the mold frame 210 face each other as shown in FIG. 3B.

The fastening member 110 of the aligned top chassis 115 and the engaging jaw 225 of the side surface are inserted into the insertion hole 215 so as to contact the fixing protrusion 220 of the mold frame 210 as shown in FIG. 3C. The locking jaw 225 is fixed to the bottom surface of the mold frame 210.

Next, as shown in FIG. 3d, the fastening member 110 is pushed into the fixing protrusion 220 in a downward direction to couple the top chassis 115 to the mold frame 210.

As described above, the liquid crystal display device according to the present invention can achieve a firm coupling between the top chassis and the mold frame by providing a reinforcing means on the upper surface of the top chassis, and can prevent product appearance defects by preventing lifting of the upper surface of the top chassis. have.

In the detailed description of the invention described above with reference to the preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge of the present invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the spirit and scope of the art.

Claims (7)

A display panel displaying an image; A backlight unit for generating light; A mold frame for accommodating the display panel; A bottom chassis fixing the backlight unit and the mold frame; A top chassis coupled to the bottom chassis and fixed to the mold frame, the backlight unit, and the display panel; And a reinforcing means for coupling the top chassis and the mold frame. The method of claim 1, And the reinforcing means is located in a mold frame and a top chassis overlapping the lamp unit. The method of claim 2, The reinforcement means, A fastening member located on an upper surface of the top chassis; An insertion hole formed in a mold frame corresponding to the fastening member; And a fixing protrusion formed at one side of the insertion hole. The method of claim 3, wherein The fastening member has a 'C' shape and is bent under the top chassis. The method of claim 3, wherein And an inlet at one side of the insertion hole is stepped. The method of claim 3, wherein And the fixing protrusion is formed to protrude out of the mold frame and one end overlaps with a part of the insertion hole.  Providing a mold frame having a fastening member for supporting the fastening member, the top chassis having a fastening member and a locking step and a stepped insertion hole to insert the fastening member; Arranging the top chassis and a mold frame to face each other; Mounting the fastening member of the aligned top chassis to the insertion hole so as to contact the lower surface of the fixing protrusion of the mold frame and fixing the locking jaw to the mold frame lower surface; And assembling the fastening member to the lower side of the fixing protrusion to engage the top chassis and the mold frame.

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