KR100544817B1 - LCD Module - Google Patents

Abstract

By forming the same size of the TFT substrate and the size of the color filter substrate, forming gates and data input pads on the side of the TFT substrate, and electrically connecting the connecting substrate on which the drive drive IC is mounted on the side of the LCD panel, Since the large screen of the module can be realized and the size of the backlight assembly is smaller than that of the LCD display screen area, the LCD module can be reduced in weight and size.

Description

LCD Module

The present invention relates to an LCD module, and more particularly, to an LCD module in which a screen display area is increased by utilizing a non-display area of an LCD panel as a screen display area.

Recently, due to the advantages of small size, light weight and low power consumption, the LCD module (Liquid Crystal Display module), which has been spotlighted as a substitute for cathode ray tube (CRT), is a display device using the electro-optic properties of liquid crystal injected into the LCD panel.

The LCD panel, which is a part of displaying information among the LCD modules, is largely composed of a TFT substrate and a color filter substrate attached to face the TFT substrate. Here, a plurality of gate lines are formed on an upper surface of the TFT substrate, and a plurality of data lines are formed to vertically intersect with the gate lines, and a thin film transistor element and a pixel electrode are formed at each intersection of the gate lines and the data lines. do.

In addition, a black matrix is formed on the upper surface of the color filter substrate to cover the data and gate lines and the thin film transistor elements, and a color filter is formed on a region corresponding to the pixel electrodes.

As shown in FIG. 1, the size of most TFT substrates 10 is larger than that of the color filter substrate 20 so that the color filter substrate 20 is attached to the upper portion of the TFT substrate 10. One side of the long side and one side of the short side of 10 are partially exposed to the outside of the color filter substrate 20. Here, the short side of the TFT substrate 10 exposed to the outside of the color filter substrate 20 is called a gate region 11, and the long side of the TFT substrate 10 exposed to the outside of the color filter substrate 20 is a source region. It is called (15). Meanwhile, end portions of the gate lines 12 and the data lines 16 are exposed to the gate region 11 and the source region 15, and end portions of the exposed gate and data lines 12 and 16 are exposed to the gate region 11 and the source region 15. Input pads 14 and 18 are formed.

In this way, the gate and data input pads 14 and 18 exposed to the gate region 11 and the source region 15 transmit an electrical signal to the gate lines 12 and the data lines 16 to display the LCD. A drive drive IC for driving the panel 30 is mounted, and according to US Patent Publication No. 5,084,961, the drive drive IC is classified into a chip on glass (COG) method and a tape automated bonding (TAB) method according to the mounting method of the drive drive IC. . Here, the GOG method is to mount the driving drive IC directly in the gate and source region. In addition, the tap method connects one end of the tape carrier package 40 in which the drive drive IC 42 is mounted to the gate and data input pads 14 and 18 of the LCD panel 30, as shown in FIG. The other end of the tape carrier package 40 is electrically connected to the output wiring 54 of the printed circuit board 50.

When the LCD panel 30 is driven while the printed circuit board 50 and the driving drive IC 42 are electrically connected to the LCD panel 30, the LCD panel 30 displays information on the screen display area 25. And a screen non-display area where information is not displayed. The screen display area 25 is an area indicated by a dotted line along the edge of the color filter substrate 20 in FIG. 1, and the screen non-display area is the gate area 11 and the source area 15 from the boundary of the screen display area 25. This area includes until.

Meanwhile, in order to drive the LCD panel 30 as shown in FIG. 2, the backlight assembly which emits light and transmits light to the LCD panel 30 as well as the driving drive IC 42 and the printed circuit board 50 ( 60 is also necessary because the liquid crystal injected between the TFT substrate 10 and the color filter substrate 20 is a material that does not emit light by itself.

The backlight assembly 60 includes a mold frame 62 in which a storage space is formed, a lamp assembly (not shown) received in the mold frame 61 to emit light, and a light guide plate for guiding the emitted light toward the LCD panel 30. 64, a reflection plate 66 disposed below the light guide plate 64 to reflect light, and a sheet type 68 installed above the light guide plate 64 to diffuse and collect light transmitted from the light guide plate 64. ), The LCD panel 30 is installed on the upper part of the sheet (68).

Recently, in order to realize light and small size reduction of the LCD module having the above-described configuration, each member constituting the LCD panel, the printed circuit board, and the backlight assembly is continuously miniaturized and thinned. On the other hand, the size of the screen effective area of the LCD panel continues to increase in order to satisfy the requirements of the high quality and the large screen of the LCD module.

However, TFT substrates act as a constraint to increase the effective surface area of conventional LCD modules and to reduce the weight and size of LCD modules.

This is because the screen display area of the LCD panel is smaller than that of the TFT substrate because the non-display area must have a gate and a small area on the short and long sides of the TFT substrate in order to mount the drive drive IC. In addition, since the gate and the source region increase the overall size of the LCD module, there is a problem in that it is difficult to reduce the weight and size of the LCD module.

Therefore, the technical problem of the present invention is to solve this problem, and an object of the present invention is to reduce the screen non-display area of the LCD panel to which the drive drive IC is electrically connected, while securing a screen effective area of approximately the same size as the TFT substrate, It is to provide an LCD module for achieving light weight and small size compared to the size of the screen display area.

In order to achieve the above object of the present invention, an LCD module includes an LCD panel, a connection board, and a printed circuit board. The LCD panel has a TFT substrate, a color filter substrate, and a liquid crystal layer interposed between the TFT substrate and the color filter substrate. The connection board is mounted with a drive drive IC, and output and input wires extending from the input / output terminals of the drive drive IC to both ends along the thickness direction of the LCD panel are formed. The printed circuit board has a plurality of output wires formed at the same pitch as the input wires, and transmits a signal for driving the LCD panel to the connection board. The TFT substrate includes a plurality of main wires extending to a front surface and a side surface, a plurality of main wires connected at one end to the main wires extending to the side surface, and the other ends connected to output wires of the connection board. It includes input pads. The color filter substrate is connected to a plurality of auxiliary wires extending to edges and side surfaces of a surface facing the front surface of the TFT substrate, and one end of the auxiliary wires extending to the side surface, and the other end of the color filter substrate. It includes a plurality of auxiliary wiring input pads connected to the output wirings of the substrate. The main wires and the auxiliary wires are electrically connected by interposed conductive double-sided adhesive.

In order to achieve the above object of the present invention, an LCD module according to another embodiment includes a lower substrate, a liquid crystal layer, an upper substrate, and a conductive double-sided adhesive. A plurality of main lines are formed in the front area of the lower substrate to define a screen display area, and main input pads are formed in the main lines in a side area corresponding to the thickness direction. The upper substrate receives the liquid crystal layer through coalescence with the lower substrate, and includes auxiliary wirings formed in an outer region of the screen display area, and auxiliary input pads connected to the auxiliary wirings in a side region corresponding to a thickness direction. do. The conductive double-sided adhesive is filled in a space in which the lower substrate and the upper substrate are combined to form a peripheral area of the screen display area to electrically connect the main lines and the auxiliary line.

According to the LCD module, the TFT substrate and the color filter substrate are formed in the same size, the main gate input pad and the main data input pad are formed on the side of the TFT substrate, and then the connection board on which the drive drive IC is mounted on the side of the LCD panel. By electrically connecting the LCD, the non-display area of the LCD module can be minimized to realize a large screen, and the size of the backlight assembly is smaller than that of the LCD module.

Hereinafter, an assembly process of the LCD module and the LCD module will be described with reference to FIGS. 3 to 6.

3 is an exploded perspective view showing the structure of the LCD panel according to the present invention, Figure 4 is a perspective view showing the structure of the color filter substrate according to the present invention, Figure 5 is a structure of a connection board mounted with a drive drive IC according to the present invention 6 is a cross-sectional view showing the structure of an LCD module according to the present invention.

As shown in FIG. 6, the LCD module 100 according to the present invention is installed on the LCD panel 130 displaying large information, and on one side of the short and long sides of the LCD panel 130, respectively. The connection board 170 to drive, the backlight assembly 160 is installed in the lower portion of the LCD panel 130 to emit light and transmit the light to the LCD panel 130, and is installed in the lower portion of the backlight assembly 160 It is composed of a printed circuit board 150 that is electrically connected to the connection board 170 to transfer an electrical signal to the LCD panel 130.

Here, the LCD panel 130 includes a TFT substrate 110 as shown in FIG. 3 and a color filter substrate 120 attached to face the TFT substrate 110, and as shown in FIG. 6. A liquid crystal layer 182 having a predetermined height in which liquid crystal is injected is formed between the substrate 110 and the color filter substrate 120.

A plurality of main gate lines 112 are formed along the short side direction of the TFT substrate 110 on the upper surface of the TFT substrate 110, and the plurality of main data lines are formed so as to vertically cross the main gate lines 112. 116 is formed along the long side direction of the TFT substrate 110. One end of each of the main gate lines 112 and the main data lines 116 extends to one side and one side of the TFT substrate 110 to be exposed to the outside, and the main gate and data lines exposed to the outside. Main gate input pads 114 and main data input pads 116 are formed at the ends of the fields 112 and 116 to be electrically connected to the connection substrate 170. Further, thin film transistor elements (not shown) and pixel electrodes (not shown) are formed at each intersection where the main gate line 112 and the main data line 116 cross each other.

The color filter substrate 120 is formed to have the same size as the TFT substrate 110 as shown in FIG. 3 to increase the screen display area 125. On the color filter substrate 120, a black matrix 121 for covering the main gate lines 112 and the main data lines 116 and the thin film transistor elements in the screen display area 125 indicated by a dotted line as shown in FIG. ) Is formed, and color filters 123 are formed at positions corresponding to the pixel electrodes.

Preferably, the main gate and the data lines 112, the short and long sides of the color filter substrate 120 corresponding to the short and long sides of the TFT substrate 110 on which the main gates and the data input pads 114 and 118 are formed. A plurality of auxiliary gate lines 122 and auxiliary data lines 126 are formed to correspond to 116. The auxiliary gate lines 122 and the auxiliary data lines 126 extend from the outside of the screen display area 125 spaced apart from the screen display area 125 to the side of the color filter substrate 120. . In addition, auxiliary gate input pads 124 and auxiliary data input pads 128 are formed at end portions of the auxiliary gate and auxiliary data lines 122 and 126 extending laterally, so that the main gate and data input pads ( 114 and 118 are electrically connected to the connection board 170. Here, the short side surface of the LCD panel 130 on which the main gate input pads 114 and the auxiliary gate input pads 124 are formed is referred to as a gate side 111, and the main data input pads 118 and the auxiliary data are provided. The long side surface of the LCD panel 130 on which the input pads 128 are formed is called the source side 115.

The reason for forming the auxiliary gate line 122 and the auxiliary data line 126 is that when the main gate line 112 and the main data line 116 are disconnected, an electrical signal is transmitted to the auxiliary gate line 122 and the auxiliary data line 126. To bypass).

Meanwhile, as shown in FIGS. 3 and 6, between the TFT substrate 110 and the color filter substrate 120 on which the main gate lines 112 and the auxiliary gate lines 122 are formed, and the main data lines 116. And a conductive double-sided adhesive 182 is attached between the TFT substrate 110 and the color filter substrate 120 on which the auxiliary data lines 126 are formed, so that the respective main gate lines 112 and the auxiliary gate lines 122 are attached. ) Are correspondingly electrically connected to each other, and the main data lines 116 and the respective auxiliary data lines 126 are correspondingly electrically connected to each other.

Further, a conductive double-sided adhesive (shown here only attached to the gate side) 183 is attached to the gate side 111 and the source side 115.

The connecting substrate 170 is attached to the gate side 111 and the source side 115 of the LCD panel 130 by the conductive double-sided adhesive 183 as shown in FIG. 3 to drive the LCD panel 130. Here, the connection board 170 is rectangular in length and the length direction is the same as the short side or long side length of the LCD panel 130, and the width direction of the connection board 170 is the LCD panel 130, the printed circuit board 150, and the mold. It is equal to the thickness of the backlight assembly 160 excluding the frame.

As shown in FIG. 5, a plurality of output wires 172 are formed along a length of the connection substrate 170 by a predetermined length, and the pitch between the output wires 172 may be the main gate lines 112 and the main. It is equal to the pitch between data lines 116. In addition, a plurality of input wires 174 having a larger pitch between the wires than the pitch between the output wires 172 in an area spaced apart from one end of the output wires 172 by a predetermined distance may be arranged in the longitudinal direction of the connection substrate 170. According to the predetermined length. Between the output lines 172 and the input lines 174, an input / output terminal of the drive drive IC 176 that transmits an electrical signal to the main gate line 112 and the main data line 116 has a conductive double-sided adhesive 184. Is bonded to each of the output wires 172 and one end of the input wires 174 through the? Here, the other ends of the output wirings 172 are connected to the main gate input pads 114 and the auxiliary gate input pads 124, and the other ends of the input wirings 174 are printed circuit boards 150. ) Is electrically connected.

As shown in FIG. 6, the backlight assembly 160 is accommodated in a mold frame 162 having a storage space formed at a lower portion thereof to transmit light emitted from a lamp assembly (not shown) to the LCD panel 130. And a reflection plate 166 installed under the light guide plate 164 to reflect the light leaked from the light guide plate 164 to the light guide plate 164, and light provided on the light guide plate 164 and transmitted from the light guide plate 164. It is composed of sheets 168 to diffuse and condense and transfer to the back of the LCD panel 130.

The printed circuit board 150 is installed under the reflective plate 166. The printed circuit board 150 includes the input wirings 174 formed on the connection board 170 with a plurality of output wires 154 formed on the printed circuit board 150. It is formed with the same pitch, and various driving elements for driving the LCD module 100 are mounted.

Here, conductive double-sided adhesives 185 and 186 are attached to each of the output wires 154 of the printed circuit board 150 and the input wires 174 of the connection board 170, and each conductive double-sided adhesive 185 is attached thereto. The FPC 155 is attached to the upper portion of the 186, and metal wires (not shown) are formed on the upper portion of the FPC 155 at the same pitch as the output wires 154. One end of the FPC 155 is attached to the output wires 154 and the other end of the FPC 155 is attached to the input wires 174 to electrically connect the printed circuit board 150 and the connection board 170. Connect.

Preferably, the conductive double-sided adhesives 182, 183, 184, 185, and 186 are anisotropic conductive films which are thermosetting resins, and an adhesive of a photocurable resin may be used.

The LCD module 100 configured as described above increases the screen display area 125 of the LCD module 100 by utilizing the conventional gate area 11 and the source area 15 as the screen display area 125. This is because when the LCD panel 130 is manufactured using a TFT substrate 110 and a color filter substrate 120 (for example, a substrate capable of producing a screen display area of 12.1 inches) having the same size as the conventional gate and source. Screens of the LCD panel 130 are included because the regions 11 and 15 are included in the display area 125 and gates and data input pads 114 and 118 are formed at one side of the LCD panel 130 on the short and long sides thereof. The display area 125 is enlarged to about 13.3 inches.

On the other hand, since the backlight assembly 60 used in the conventional 12.1 inch size LCD panel 30 is equally applied to the 13.3 inch size LCD panel 130 of the present invention, the size of the backlight assembly 160 is increased. It can be said that compared to the screen display area 125 of (130).

The assembly process of the LCD module of the present invention configured as described above will be described, with reference to the gate side shown in the drawings.

First, a conductive double-sided adhesive 182, for example, an anisotropic conductive film 182, is attached along the long side and short side edges of the TFT substrate 110 on which the gate and data input pads 111 and 115 are formed.

Thereafter, the color filter substrate 120 is placed on the TFT substrate 110 such that one surface of the TFT substrate 110 on which the thin film transistor elements are formed and one surface of the color filter substrate 120 on which the black matrix 121 is formed face each other. The TFT substrate 110 and the color filter substrate 120 are aligned with each other and heat and pressure are applied to the TFT substrate 110 and the color filter substrate 120. In this case, the pixel electrodes are aligned with the color filters 123, and the main gate lines 112, the main data lines 116, and the thin film transistor elements existing in the screen display area 125 are black matrix 121. ), And the main gate lines 112 and the main data lines 116 that are outside the display area 125 are respectively connected to the auxiliary gate lines 122 and the auxiliary data lines 126. Align.

As such, after each main gate line 112 and each auxiliary gate line 122 are aligned, the main gate lines 112 and the auxiliary gate lines 122 are electrically connected using the anisotropic conductive film 182. When one of the main gate lines 112 is disconnected at the end where the sub gate input pad 124 is formed, the electrical signal transmitted from the connection board 170 is bypassed to the auxiliary gate line 122. Since the product is transferred to the main gate line 112, defects of the product may be minimized.

When the TFT substrate 110 and the color filter substrate 120 are attached to each other, the anisotropic conductive film 183 is attached to the gate side 111 by applying heat and pressure to drive the gate line 112 of the LCD panel 130. do. The main gate input pad 114 and the output wirings 172 of the connection board 170 are aligned with each other, and then heat and pressure are applied to the anisotropic conductive film 183 and the connection board 170. When attached, the main gate input pads 114 and the output wirings 172 are electrically connected to each other, and electrical signals transmitted from the driving drive IC 176 drive the gate lines 112.

Subsequently, the LCD panel 130 is accommodated in the mold frame 162 at the lower surface of the mold frame 162, and then the sheets 168, the light guide plate 164, and the reflective plate 166 are disposed under the LCD panel 130. I store it in order.

Subsequently, the anisotropic conductive film 185 is attached to the top of the output wirings 154 of the printed circuit board 150 by applying heat and pressure, and one end of the metal wiring of the FPC 155 and the output wirings of the printed circuit board 150. After 154 are aligned with each other, heat and pressure are applied to the anisotropic conductive film 185 to electrically connect the output wires 154 of the printed circuit board 150 and the metal wires of the FPC 155.

Subsequently, in order to electrically connect the connecting board 170 and the printed circuit board 150, an anisotropic conductive film 186 is attached to the input wirings 174 of the connecting board 170 and the metal wiring of the FPC 155 is connected. After the other end and the input wirings 174 are aligned with each other, heat and pressure are applied to electrically connect the input wirings 174 and the metal wiring of the FPC 155. As such, when the printed circuit board 150 and the connection board 170 are electrically connected by the FPC 155, various electrical signals generated from the printed circuit board 150 are transferred to the LCD panel 130 through the connection board 170. The LCD panel 130 displays the information.

As described above, the TFT substrate 110 and the color filter substrate 120 are formed in the same size, so that the gate region 11 and the source region 15 formed on the TFT substrate 110 in the related art are displayed on the screen display region 125. By using it, the large screen of the LCD module 100 can be realized, and the LCD module 100 can be lighter and smaller in size than the size of the screen display area 125.

As described above, in the present invention, the TFT substrate and the color filter substrate are formed in the same size, and the main gate input pad and the main data input pad are formed on the side of the TFT substrate, and then the drive drive IC is mounted on the side of the LCD panel. By electrically connecting the connecting board, the non-display area of the LCD module can be minimized to realize a large screen, and the size of the backlight assembly is smaller than that of the LCD module, thereby reducing the weight and size of the LCD module.

1 is a perspective view showing a conventional LCD panel structure,

2 is a cross-sectional view showing a conventional LCD module structure.

3 is an exploded perspective view showing the structure of the LCD panel according to the present invention;

4 is a perspective view showing the structure of a color filter substrate according to the present invention;

5 is a perspective view showing the structure of a connecting board mounted with a drive drive IC according to the present invention;

6 is a cross-sectional view showing the structure of an LCD module according to the present invention.

Claims (6)

An LCD panel having a liquid crystal layer interposed between a TFT substrate, the TFT substrate, and a color filter substrate; A connection board having a drive drive IC mounted thereon, the output substrate having input and output wires extending from both input and output terminals of the drive drive IC to both ends in a thickness direction of the LCD panel; And A plurality of output wirings are formed at the same pitch as the input wirings, and includes a printed circuit board for transmitting a signal for driving the LCD panel to the connection board, The TFT substrate includes a plurality of main wires extending to a front surface and a side surface, a plurality of main wires connected at one end to the main wires extending to the side surface, and the other ends connected to output wires of the connection board. Including input pads, The color filter substrate is connected to a plurality of auxiliary wires extending to edges and side surfaces of a surface facing the front surface of the TFT substrate, and one end of the auxiliary wires extending to the side surface, and the other end of the color filter substrate. A plurality of auxiliary wiring input pads connected to the output wirings of the substrate, And the main wirings and the auxiliary wirings are electrically connected by interposed conductive double-sided adhesive. The method of claim 1, wherein the main wirings A plurality of main gate lines; And A plurality of main data lines, The main wiring input pads A plurality of main gate input pads having one end connected to each of the main gate lines extending to the first side surface of the TFT substrate, and the other end electrically connected to output wires of the connection substrate; And One end is formed to be connected to each of the main data lines extending to the second side surface of the TFT substrate, and the other end includes a plurality of main data input pads electrically connected to the output wires of the connection substrate. LCD module. The LCD module of claim 1, wherein the conductive double-sided adhesive is a thermosetting resin. 4. The LCD module according to claim 3, wherein the thermosetting resin is an anisotropic conductive film. The LCD module according to claim 1, wherein the conductive double-sided adhesive is a photocurable resin. A lower substrate having a plurality of main wires formed in the front area to define a screen display area, and a side area corresponding to a thickness direction of the lower substrate having main input pads formed in the main wires; Liquid crystal layer; An upper substrate accommodating the liquid crystal layer through coalescence with the lower substrate, the upper substrate including auxiliary wirings formed in an outer region of the screen display area, and auxiliary input pads connected to the auxiliary wirings in a side region corresponding to a thickness direction; And And a conductive double-sided adhesive that is joined to the lower substrate and the upper substrate and is filled in a space formed in a peripheral area of the screen display area to electrically connect the main lines and the auxiliary line.