KR20000050689A - Liquid Crystal Display and assembly method for the same - Google Patents

Abstract

PURPOSE: A liquid crystal display device and a method for assembling the same are provided to accumulate the components of COG type liquid crystal display device on a rear case. CONSTITUTION: A liquid crystal display device includes a rear case(230), a back light assembly, a COG(chip on glass) type liquid crystal display panel(211), and a front case(220). The rear case(230) includes a binder on a sidewall and a container member and an inverter container on the bottom. The back light assembly includes a container frame, a reflection plate, a light waveguide plate, a lamp assembly, and a plurality of optical sheets. The back light assembly is formed with four side walls. The COG type liquid crystal display panel(211) is connected to a drive IC(integrated circuit). The liquid crystal display panel further includes a flexible printed circuit which is electrically coupled with a printed circuit board contained on the container member of the printed circuit board. The front case(220) covers the front surface of the effective screen of the COG type liquid crystal display panel and is coupled with the rear case through a binding nose.

Description

Liquid Crystal Display and assembly method for the same

The present invention relates to a liquid crystal display device and a method for assembling the same, and more particularly, a chip on glass (COG) type liquid crystal display panel in which a driving drive IC is mounted directly on an upper surface of a TFT substrate. The present invention relates to a liquid crystal display device and a method of assembling the liquid crystal display device by improving the shape and assembly method thereof.

Recently, as the information society is implemented, the importance of information and information processing is increasing day by day, and the importance of the information processing device for processing information faster than the short time is also increasing proportionately. It is becoming.

As a result of this trend, the spread of industrial computers and personal computers, which are information processing devices, has been greatly increased.In general, personal computers, which are widely distributed to the public, are lighter and smaller than desktop computers, and have excellent mobility. There is a growing interest in developing and disseminating technology that can handle portable computers.

Such a portable computer has a development purpose of miniaturization and light weight so as to be suitably portable in addition to the inherent purpose of processing information in a short time.

In order to implement a portable computer having such a development purpose, it is almost impossible to use a CRT (Cathode Ray Tube) having a large volume and weight as a display device for displaying processed information. Most portable computers are CRT as a display device. Compared to this, a very small and lightweight liquid crystal display device is adopted.

A liquid crystal display device manufactures a number of thin film transistors on a transparent glass substrate by a semiconductor thin film manufacturing process, and each thin film transistor is formed with a pixel electrode having a larger area than the thin film transistor. At this time, the transparent glass substrate on which the thin film transistor is formed will be defined as a TFT substrate.

In this case, a gate line and a data line, which are signal lines for selectively turning on the thin film transistor, are connected to the thin film transistor.

Where the pixel electrode of the TFT substrate formed as described above is opposed to the RGB pixel and the pixel electrode, the color filter substrate on which the common electrode is formed to have a predetermined distance from the TFT substrate is formed so that an electric field is formed when power is applied to the pixel electrode. Installed in a state. At this time, a liquid crystal whose alignment is changed by an electric field is injected between the TFT substrate and the color filter substrate.

In order to drive any liquid crystal in a state in which a color filter substrate is coupled to a TFT substrate and a liquid crystal is injected, an electric field must be formed as described above with respect to the pixel electrode and the common electrode of the TFT substrate. Must be driven selectively.

For this reason, there is a need for a printed circuit board on which a driving drive IC and an element for processing a display signal are mounted, and a display signal is input from the outside to the printed circuit board.

At this time, the TAB (Tape Automated Bonding) method and the COG method have been developed as a method of mounting the drive drive IC on a TFT substrate and a printed circuit board. The TAB method is called a flexible tape carrier package in which the drive drive IC is flexible. After mounting on the medium, one end of the tape carrier package is mounted on the TFT substrate, and the other end is mounted on the printed circuit board, and then the printed circuit board is bent to the rear of the TFT substrate to significantly reduce the area occupied by the printed circuit board. to be.

In the COG method, a direct drive driver IC is mounted on the ends of a gate line and a data line formed on a TFT substrate by a flip chip method, and then a TFT substrate and a printed circuit board are formed at both ends of a flexible printed circuit (FPC). This is how you connect.

A liquid crystal display panel constructed by mounting a drive driver IC on a TFT substrate by a COG method is a lamp assembly, which is a light source that provides light passing through the liquid crystal display panel, a plurality of sheets to increase the efficiency of the light, and a lamp assembly to change the direction of the light. And a light guide plate coupled to a light emitting plate and a rectangular box having an upper surface opened to accommodate them, and a backlight assembly including a storage container called a mold frame and a chassis made of stainless material to prevent the liquid crystal display panel from being separated from the outside. Configure.

The liquid crystal display module formed as described above is mounted on a case including a rear case and a front case to manufacture a display device, and the display device is coupled to a separately manufactured information processing main body to produce a portable information processing device.

However, the liquid crystal display of the conventional information processing apparatus has a problem in that an unnecessary increase in the thickness of the liquid crystal display occurs because the liquid crystal display module and the case are separately manufactured and then assembled by assembling the liquid crystal display module in the case.

Accordingly, the present invention has been made in view of such a conventional problem, and an object of the present invention is to fabricate a COG type liquid crystal display module, and then mount it on a case to produce a COG type liquid crystal display module in a laminated manner without manufacturing a liquid crystal display device. After stacking the constituent members of each other, the upper part of the COG liquid crystal display panel is pressed by the front case to greatly reduce the overall thickness of the liquid crystal display device.

In order to achieve the object of the present invention, the storage container for storing the COG liquid crystal display panel, which is a component of the liquid crystal display device, is combined with the side of the rear case to further reduce the overall size of the liquid crystal display device while increasing the effective display area. Is in.

In order to achieve the object of the present invention is to further reduce the thickness of the liquid crystal display device by screwing the hinge for coupling the main body and the liquid crystal display device to the side of the rear case.

1 is an external perspective view of an information processing apparatus employing a liquid crystal display according to the present invention.

2 is an exploded perspective view of a liquid crystal display device according to the present invention;

Figure 3 is a partially exploded perspective view showing a side mount hinge according to the present invention.

4 is a plan view cut out the front case portion so that the plane is shown after assembling Figure 2;

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a cross-sectional view taken along line B-B in FIG. 4.

7 is a cross-sectional view taken along the line C-C of FIG.

8 is a sectional view taken along the line D-D in FIG. 4;

In order to achieve the object of the present invention, a liquid crystal display device includes a rear case in which a fastening means is formed on a side wall, and a printed circuit board accommodating part and an inverter accommodating part are formed on a side of the rectangular container shape having side walls formed at four edges, respectively. , A storage frame having four sidewalls to be received on the floor and having a coupling portion at a portion corresponding to the fastening means, a reflection plate accommodated inside the storage frame, a light guide plate mounted on an upper portion of the reflection plate, a lamp assembly coupled to the light guide plate, and a plurality of A backlight assembly composed of optical sheets, a top panel, a bottom panel coupled to a top panel via liquid crystal, a drive drive IC and a drive drive IC mounted on an upper surface of one side of the lower panel and an upper surface of the other side adjacent to one side of the lower panel; Connected and electrically connected to the printed circuit board housed in the printed circuit board housing. Includes a COG type liquid crystal display panel with a flexible printed circuit for a positive display panel, and a front case covering the front side except the effective screen area of the COG type liquid crystal display panel and having a fastening protrusion that overlaps with the fastening groove of the rear case. do.

In the method of assembling the liquid crystal display device configured as described above, a mounting frame or an inverter-coupled printed circuit board is mounted on the rear case, and the other side of the receiving frame or inverter-coupled printed circuit board is seated on the rear case. After stacking and storing the remaining backlight assembly except the housing frame in the case, seating the COG type liquid crystal display panel on the upper surface of the backlight assembly, and coupling the connector formed on the COG type liquid crystal display panel to the board-to-board connector formed on the printed circuit board, Coupling the engaging projection of the front case is coupled to the first coupling groove and the second coupling groove of the case.

Hereinafter, a liquid crystal display and an assembly method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

1 shows an information processing apparatus to which a liquid crystal display according to the present invention is applied.

Referring to FIG. 1, the information processing apparatus 300 receives a display signal generated from the main body 100 and the main body 100 to process the information input by the user as a whole and generate a display signal corresponding to the result. The display device 200 is configured to reproduce an image corresponding to the display signal.

As shown in FIG. 2, the display apparatus 200, which is a core part of the present invention, is composed of a liquid crystal display 210 and a case 220 and 230.

A more specific configuration of the liquid crystal display of the information processing device having reduced thickness is described as follows.

The liquid crystal display device 211 is generally composed of cases 220 and 230, a COG type liquid crystal display panel 211, and a backlight assembly.

First, the cases 220 and 230 are composed of the front case 220 and the rear case 230. The shapes and structures of the rear case 230 serving as a base of the liquid crystal display device 210 will be described in detail as follows. same.

The rear case 230 is manufactured by casting a magnesium alloy by a die casting method so that the upper surface of the rectangular parallelepiped box is completely opened so that only the side surfaces 233, 234, 235 and 236 and the bottom surface 232 remain.

The rear case 230 manufactured by casting as described above has a hinge 237, a main printed circuit board accommodating part (not shown) to which the main printed circuit board 245 is fixed, and an inverter accommodating part accommodating the inverter 250 ( Not shown) and the receiving frame 218 of the backlight assembly has a rather complicated shape.

To describe the rear case 230 having a somewhat complicated shape in more detail, one side 236 of the four side (233,234,235,236) to secure a space for installing the hinge 237 hinged to the main body 100 A predetermined length of the hinge portion 238 protrudes from the side surface 236, and a through hole 238b penetrates the side surface 238a of the hinge portion 238 through a hinge protrusion 237a which will be described later as a component of the hinge 237. ) Is formed.

Referring to FIG. 3, the hinge 237 includes a hinge protrusion 237c and a hinge protrusion 237c that rotates with respect to the hinge body 237b and the hinge body 237b that protrude in a predetermined shape from the hinge body 237b and the hinge body 237b. 237a, and a screw fastening hole 237d is formed in the hinge clamp 237c to be screwed into the side surface 238a of the hinge portion 238 of the rear case 230.

As such, the hinge 237 mounted to the rear case 230 may be installed at both sides of the hinge part 238.

In this way, the remaining three sides 233, 234, and 235 of the rear case 230 in which the hinge part 238 for the hinge 237 is provided are coupled to the storage frame 218 and the rear case 230 accommodated in the rear case 230. The fastening part 239 for simultaneously coupling the front case 220 is formed.

In the present invention, the fastening part 239 is provided with three different embodiments, respectively, in order to increase the coupling rigidity of the rear case 230 and the front case 220.

Referring to FIG. 2, FIG. 4, and FIG. 6 attached as the first embodiment, the remaining two except for the side 234 facing the hinge portion 238 described above among the four side surfaces 233, 234, 235, and 236 of the rear case 230. The first fastening groove 239c is formed in the two side surfaces 233 and 235 from the outside of the side surfaces 233 and 235 of the rear case 230 to form an inner direction of the side surfaces 233 and 235 so as to form a predetermined distance from the outer surface of the storage frame 218 to be described later. Is formed.

2, 4, and 7, the outer side of the storage frame 218 is disposed on the side surfaces 233 and 235 of the rear case 230 spaced a predetermined distance from the first fastening groove 239c. A second fastening groove 239a having a groove depth about twice that of the first fastening groove 239c while being in contact with the side surface is formed.

2, 4, and 8, a first snap fit 239e is formed on the side surface 234 of the other rear case 230 and the rear case 230 is formed. ) And a second snap fit 222 engaging with the first snap fit 239e is formed in the front case 220 coupled thereto.

In the first embodiment, between the first fastening groove 239c of the rear case 230 and the outer surface of the storage frame 218, the fastening protrusion 224 formed in the front case 220 to be described later is inserted, and then the screw By fastening, the fastening screw 231 penetrates the side surfaces 233 and 235 of the rear case 230 and the front case 220 and is screwed to the insert 216 formed in the storage frame 218.

In the second embodiment, the second fastening groove 239a of the rear case 230 is screwed directly with the receiving frame 218 and the protrusion 226 formed on the front case 220 serves to cover the screw.

The backlight assembly is accommodated in the rear case 230 formed as described above.

The backlight assembly is generally composed of a lamp assembly 212, a reflecting plate 213, a light guide plate 214, optical sheets 215, and a receiving frame 218 to prevent their flow.

The storage frame 218 serving as a frame of the backlight assembly will be described in more detail. The storage frame 218 is formed of three sides 218a, 218b, and 218c having one of the upper and lower surfaces thereof and one of the side surfaces removed. to be.

Each side 218a of the storage frame 218 corresponding to the first fastening groove 239c and the second fastening groove 239a described above in a state where the storage frame 218 formed as described above is seated on the rear case 230. , 218c is formed with a groove or a through hole for screwing.

In this case, when the storage frame 218 having weak strength is directly fastened with the fastening screw, damage of the storage frame 218 may occur and the tapping process of the storage frame 218 may not be easily performed. The inner circumferential surface is tapped in the groove or the through-hole so that a reinforcing material called an insert 216 having a female thread portion is inserted therein, and then the insert 216 and the fastening screw are directly fastened.

In addition, a recess groove 218d is formed inside the two adjacent side surfaces 218a and 218b of the storage frame 218 to have a predetermined distance, and the recess groove 218d will be described in detail later. The liquid crystal display panel 211 has the same spacing as the drive driver IC 211a.

As described above, the light guide plate 214 coupled with the reflector plate 213, the lamp assembly 212, and the lamp assembly 212 is provided inside the storage frame 218 while the storage frame 218 is screwed to the rear case 230. It is settled in order.

The lamp assembly 212 includes a cold cathode ray tube type lamp 212a and a lamp cover 212b made of brass having a high light reflectance to propagate light generated from the lamp 212a to the light guide plate 214.

At this time, the lamp cover 212b is in direct contact with the rear case 230 made of magnesium alloy, which causes the lamp 212a-lamp cover 212b-rear case 230 to form a closed circuit and leak from the lamp 212a. It is preferable that the insulating member 212c is attached to a portion where the lamp cover 212b and the rear case 230 contact each other so that a leakage current does not escape to the outside when a current is generated.

When the lamp assembly 212 and the light guide plate 214 are coupled to the receiving frame 218, a plurality of optical sheets 215 are seated on the top surface of the light guide plate 214. The COG type liquid crystal display panel 211 is mounted on the upper surface of the optical sheet 215 located at the top of the optical sheet 215.

The COG type liquid crystal display panel 211 is a TFT substrate 211e having a plurality of thin film transistors formed on a transparent glass substrate to meet a predetermined resolution by a semiconductor thin film process, and a color filter substrate 211f formed on an upper surface of the TFT substrate 211e. ) And the liquid crystal interposed between the TFT substrate 211e and the color filter substrate 211f.

A gate line and a data line for selectively turning on the thin film transistor are connected to the thin film transistor, and a gate driving drive IC 211d and a data driving drive IC 211a are formed in each gate line and the data line.

In this case, the gate driving drive IC 211d and the data driving drive IC 211a are applied to the display signal generated from the main printed circuit board 240 described above to the gate driving drive IC 211d and the data driving drive IC 211a. The flexible printed circuit 211b for a drive drive IC is mounted in this.

In this case, the liquid crystal display panel connector 211c coupled to the board-to-board connector 245 of the main printed circuit board 240 is formed on the flexible printed circuit 211b for the driving drive IC.

The COG liquid crystal display panel 211 formed as described above is seated on an accommodating frame 218 accommodated up to the optical sheets 215, and then the liquid crystal display panel connector 211c and the board-to-board connector ( 245 are interconnected.

Thereafter, the first fastening groove 239c and the fastening protrusion 224 of the front case 220 and the second fastening groove 239a in a state where the front case 220 is coupled to the upper surface of the rear case 230 overlap with each other. The protrusions 226, the first snap fits 239e and the second snap fits 222 of the front case 220 are engaged with each other, and the rear case 230-the front case 220-the storage frame ( 218 is combined to produce a liquid crystal display, and the liquid crystal display is combined with the main body 100 to produce an information processing apparatus 300.

As described in detail above, in a state in which a printed circuit board and an inverter are connected in series with the rear case, the thickness of the liquid crystal display panel is greatly reduced by stacking and accommodating the components of the COG type liquid crystal display panel in order. The thickness of the liquid crystal display can be further reduced by mounting a hinge on the side of the rear case to allow the liquid crystal display to rotate from the main body.

Claims (12)

A rear case in which a fastening means is formed on the side walls, and a printed circuit board accommodating portion and an inverter accommodating portion are formed on a bottom thereof in a rectangular container shape having side walls formed at four edges, respectively; A storage frame having four sidewalls to be received on the bottom and having a coupling portion formed at a portion corresponding to the fastening means, a reflection plate received inside the storage frame, a light guide plate mounted on an upper portion of the reflection plate, and a lamp assembly coupled to the light guide plate A backlight assembly composed of a plurality of optical sheets; An upper panel, a lower panel coupled to the upper panel via liquid crystal, an upper surface of one side of the lower panel, and a driving drive IC mounted on an upper surface of the other side adjacent to one side of the lower panel and the driving drive IC and connected to the printed circuit A COG type liquid crystal display panel provided with a flexible printed circuit for a liquid crystal display panel electrically connected to a printed circuit board stored in the substrate accommodating part; And a front case covering a front surface excluding an effective screen area of the COG type liquid crystal display panel and having a fastening protrusion coupled to overlap with a fastening groove of the rear case. The printed circuit board of claim 1, wherein a printed circuit board is accommodated in the rear case, a inverter is accommodated in the inverter housing, and a flexible printed circuit is connected to the printed circuit board. A liquid crystal display device. The liquid crystal display of claim 2, wherein a first connector is formed on the printed circuit board, a second connector is formed on the inverter, and the first connector and the second connector are connected in series. 2. The board of claim 1, wherein a board to board connector is formed on an upper surface of the printed circuit board, and a connector to be connected to the board to board connector is formed on the flexible printed circuit for the liquid crystal display panel. Liquid crystal display device. The method of claim 1, wherein the fastening means comprises: a first fastening groove projecting a predetermined length to face the inside of the rear case; A second fastening groove which is formed on a side surface of the rear case spaced apart from the first fastening groove and has a groove depth smaller than that of the first fastening groove; And a fastening hole formed in the first fastening groove and the second fastening groove so as to pass through the rear case. 6. The liquid crystal display of claim 5, wherein an insert is formed in the coupling portion of the storage frame corresponding to the fastening hole. The liquid crystal display of claim 5, wherein the front case includes a fastening protrusion inserted between the first fastening groove and the receiving frame and having a fastening hole, and a protrusion inserted into the second fastening groove. Device. The method of claim 1, wherein the fastening means is a first snap fit (snap) formed on the inner side of the rear case, the second snap fit formed on the inner side of the front case to be engaged with the first snap fit A liquid crystal display device. The method of claim 5, wherein the first fastening groove, the second fastening groove is formed on two side surfaces of the rear case facing each other, the first snap fit the first fastening groove, the second fastening The liquid crystal display device, characterized in that formed in one of the remaining two side surfaces in which no groove is formed. Hinge body installed on the bottom surface of the rear case to hinge-couple the main body for applying the video signal to the liquid crystal display panel according to claim 1: A hinge shaft installed at the hinge body and pivoting through the side surface of the rear case; And a hinge fixing member mounted to the hinge body and coupled to a side surface of the rear case. The liquid crystal display of claim 10, wherein a fastening hole is formed in the hinge fixing member, and a fastening hole is formed in the rear case corresponding to the fastening hole. In the method of assembling the liquid crystal display device according to claim 1, Mounting one of a printed circuit board having an accommodation frame or an inverter coupled to the rear case; Mounting the other one of the printed circuit board to which the accommodation frame or the inverter is coupled; Stacking and storing the backlight assembly other than the housing frame in the rear case; Mounting a COG type liquid crystal display panel on an upper surface of the backlight assembly and coupling a connector formed on the COG type liquid crystal display panel to an inter-board connector formed on the printed circuit board; And coupling the coupling protrusion of the front case coupled to the first coupling groove and the second coupling groove of the rear case.