KR100691475B1 - Lcd module - Google Patents

Abstract

Signal transmission lines for applying signals such as data and power voltage to each driving circuit film are respectively formed on the LCD panel and each driving circuit film, which are formed on the LCD panel to supply the power voltage to each driving circuit film. Form the area of the transmission wiring as large as possible in the given space, and form the connection pad formed on the input lead for voltage of the driving circuit film and bonded to the voltage transmission wiring in the longitudinal direction of the driving circuit film to make the area of the connection pad as large as possible. do.

Then, the lengths of the signal transmission lines are shortened and the area of the power transmission lines and the connection pads is increased, thereby reducing the resistance and improving the reliability of the LCD module.

LCD panel, data transfer wiring, voltage transfer wiring, drive circuit film, input lead for data, input lead for voltage

Description

LCD Module {LCD MODULE}

1 is a perspective view showing a conventional LCD module driving device.

Figure 2 is an exploded perspective view schematically showing the structure of the LCD module according to the present invention.

3 is a plan view showing the structure of the LCD panel according to the present invention.

Figure 4 is a plan view showing the structure of a drive circuit film according to the present invention.

5 is a plan view showing a state in which the connection film and the driving circuit films are attached to the LCD panel according to the present invention.

The present invention relates to an LCD (Liquid Crystal Display (LCD)) module, and more particularly, a data signal and a power supply voltage between input pad bonding blocks formed by gathering a plurality of input pads in an LCD panel. LCDs that reduce the size and thickness of the LCD module by forming signal transmission wires for applying a signal and electrically connecting bonding pads of input leads arranged in mirror form on both sides of the center line of the driving circuit film to the signal transmission wires. It is about a module.

Preferably, among the signal transmission wires formed in the LCD panel, power wires for supplying a power voltage to each of the driving circuit films are thickened to reduce connection resistance, and are formed on the drive circuit film to be electrically connected to the power wires. The connection pads of the leads are formed in the longitudinal direction of the drive circuit film to have a large connection area.

Recently, liquid crystal display devices, which have been in the spotlight as display products, are mainly used to display information using LCD's electrical / optical properties, a driving device electrically connected to the LCD panel to drive the LCD panel, and a light required to drive the LCD panel. It consists of a backlight assembly that emits light and guides the emitted light to the LCD panel.

The LCD panel is composed of a thin film transistor (“TFT”) substrate, a color filter substrate facing the TFT substrate, and a liquid crystal material injected between both substrates, and includes a plurality of gate lines and a plurality of gate lines on the TFT substrate. Data lines cross each other, and a thin film transistor and a pixel electrode, which are switching elements, are formed in an intersection region of the gate lines and the data lines. Input pads connected to the driving device are formed at one end of each of the gate lines and the data lines.

A driving device that applies a driving signal for driving the LCD panel to the LCD panel is usually electrically connected to the data lines and electrically connected to the source driving circuit film and gate lines to apply the gray scale voltage to turn on / off the thin film transistor. Source and gate printed circuits electrically connected to the gate driving circuit film, the source and gate driven circuit film applying the signal to be turned off, and various components are mounted to transfer predetermined signals to the source and gate driven circuit film. It consists of a substrate. In this case, the gate and source driving circuit film is formed by mounting the driving drive IC on a flexible film on which the input leads and output leads are printed.

In the LCD module having such a configuration, the area occupied by the source printed circuit board is large, which makes it difficult to miniaturize and thin the LCD module.

As shown in FIG. 1, the active elements mounted on the source printed circuit board, that is, the timing controller 21 and the voltage generator 23 are large in size, and the LCD panel 10 and the source printed circuit board 20 are large. Signal transmission lines 25 for electrically connecting each of the source driving circuit films 30 bonded to each other to apply data signals, power voltages, and various control signals, are based on the connection pads 26. This is because the area occupied by the signal transmission lines 26 in the source printed circuit board 20 is wide because it is formed downward to form a wave shape.

When the signal transmission line 26 is formed in a wave shape, as described above, the size of the source printed circuit board 20 is increased or the number of layers stacked is increased, thereby increasing the manufacturing cost of the LCD module. This is because the number of signal transmission lines 26 that can be formed in one layer is determined according to the wiring width of the signal transmission lines 26 and the interval between the signal transmission lines 26.

In addition, when the signal transmission line 26 is formed in a wave shape, the length of the signal transmission line 26 is increased, thereby increasing resistance.

Accordingly, it is an object of the present invention to reduce the size and thickness of a liquid crystal display by removing the source printed circuit board, and to reduce the manufacturing cost of the liquid crystal display.                         

Another object of the present invention is to reduce the resistance by forming a short length of the signal transmission line.

Still other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

In order to achieve the above object, the present invention provides a TFT substrate in which a plurality of gate lines and data lines having input pads formed at one end thereof intersect with each other, and one end of the gate lines and one end of the data lines having input pads exposed to the outside. An LCD panel having a color filter substrate attached thereto, the signal transmission lines configured to transfer a signal input from the outside to a predetermined device on an exposed portion of the color filter substrate;

A plurality of driving circuit films bonded to signal transmission lines and the input pads to generate driving signals for driving the LCD panel;

An auxiliary printed circuit board having driving elements mounted on one surface thereof to generate various signals necessary for generating a driving signal;

A connection film electrically connecting the auxiliary printed circuit board and the LCD panel to apply various signals to the signal transmission wiring, wherein the drive circuit film is mounted on one surface of the base substrate and the base substrate to generate driving signals; It is formed on the back surface of the base substrate, one end is connected to the signal transmission line and the other end is formed on the back surface of the base substrate and the input leads for transmitting a signal to the next drive circuit film and the other end is connected to the input terminal of the drive drive IC, It is connected to the output terminal of the drive drive IC, the other end is bonded to the input pad is composed of output leads for applying the drive signal generated by the drive drive IC to the LCD panel.

Hereinafter, the structure of the LCD module according to the present invention will be described with reference to FIGS. 2 to 6.

As shown in FIG. 2, the LCD module 100 according to the present invention includes an LCD panel 110 displaying information by electric and optical properties, a timing controller 210 and a power generator 220 on an upper surface thereof. The same active elements are mounted so that the auxiliary printed circuit board 200 generating the data signal and the power supply voltage required to drive the LCD panel 110 and the data signal and the power supply voltage generated from the auxiliary printed circuit board 200 may be used. Connection film 250 and LCD which electrically connects the driving circuit film 300, the auxiliary printed circuit board 200, and the LCD panel 110 that receive the input to form a driving signal. Is installed on the lower surface of the panel consists of a backlight assembly 400 that irradiates the light required to drive the LCD panel 110 and guides the irradiated light to the back of the LCD panel 110.

The structure of the above-listed elements will be described in more detail with reference to FIGS. 3 to 5 as follows.

As illustrated in FIG. 3, the LCD panel 110 is attached to the TFT substrate 120 and the color filter substrate 190 so as to face each other, and between the TFT substrate 120 and the color filter substrate 190 may have electricity and light. The liquid crystal which reacts to is injected.

The TFT substrate 120 is formed by crossing a plurality of gate lines (not shown) and data lines (not shown) with each other, and a thin film transistor element (not shown) and a pixel are formed at the intersection of the gate lines and the data lines 142. An active region 130 which is formed to display information, and is located at one end in the longitudinal direction of the TFT substrate 120 from the outside of the active region 130, and a predetermined portion of one end of the gate lines is moved out of the color filter substrate 190. The gate region 135 is exposed and the source region 140 is disposed at one end in the width direction of the TFT substrate 120, and a predetermined portion of one end of the data lines 142 is exposed to the outside of the color filter substrate 130. Since the source region is mainly shown in FIG. 3, only the source region will be described below.

Input pads 144 electrically connected to the driving circuit film 300 are formed at ends of the data lines 142 formed in the source region 140, and a plurality of input pads are formed at predetermined portions of the source region 140. 144 gather to form the input pad bonding blocks 145a and b, and the respective input pad bonding blocks 145a and b are spaced apart from each other by a predetermined distance.

In addition, a front side of the input pad bonding block 145a (the input pad bonding block formed to be closest to the gate region) positioned first in the source region 140 may be electrically connected to the connection film 250 so as to provide a data signal and a power supply. First signal transmission lines 150 for supplying a voltage to each of the driving circuit films 300 are formed, and the respective driving circuit films 300 are electrically connected between the input pad bonding blocks 145a and b. Second signal transfer wires 160 are formed to be connected to provide a data signal and a power supply voltage transfer path. The first and second signal transfer wires 150 and 160 are data transfer wires 152 and 162 for transmitting data signals to the respective driving circuit films 300, and voltages for applying a power supply voltage to the respective drive circuit films 300. Transfer wirings 158 and 168.

The data transmission lines 158 and 168 have a rectangular shape in which a portion to which the driving circuit film 300 is attached is opened, and the connection film 250 and the driving circuit film are formed at both ends of the data transmission lines 158 and 168. Connection pads 154 and 155 to which 300 is bonded are formed.

In addition, the voltage transmission lines 158 and 168 are formed in a rectangular shape in the data transmission line 125a which is located at the innermost side among the data transmission lines 152 and prevent a voltage drop from occurring due to an increase in contact resistance. In order to form the area as large as possible in a given space, as shown in FIG.

Although not shown, signal transmission lines formed in the gate region 150 are also formed when the gate lines are formed for the above-described reason. In FIG. 3, only five data transfer wires are shown for convenience of description.

Next, the auxiliary printed circuit board 200 will be described. The auxiliary printed circuit board 200 has a small square shape as shown in FIGS. 2 and 5, and the timing controller 210 and the above-described surface are formed on the upper surface of the auxiliary printed circuit board 200. Driving elements such as the voltage generator 220 and the like are mounted. In addition, a data output between the connection film 250 and the timing controller 210 of the upper surface of the auxiliary printed arc substrate 200 to output the control signal and the data signal output from the timing controller 210 to the connection film 250. The wiring 215 is formed, and a voltage output wiring 225 is formed between the connection film 250 and the voltage generator 220 to transmit the power voltage generated by the voltage generator 220 to the connection film 250. do.                     

As described above, the auxiliary printed circuit board 200 is separately mounted with the driving elements 210 and 220 and only a few output wires 215 and 225 are applied to the connection film 250 to apply the data signal and the power voltage. Since the circuit board 200 is much smaller than the conventional source printed circuit board 20 and the auxiliary printed circuit board 200 can be formed in one or two layers, the auxiliary printed circuit board 200 can be made thin. Manufacturing costs can also be reduced.

The connection film 250 is formed on the LCD panel 110 and the data and voltage output wires 215 and 225 formed on the auxiliary printed circuit board 200 on one surface of the flexible thin film 252 as shown in FIG. 5. It is formed by printing the connection wires 260 that electrically connect the first signal transfer wires 150, and the connection wires 260 include data connection wires 255 and voltage connection wires 265. do.

One end of the data connection wires 255 is connected to the data output wire 215, and the other end thereof is bonded to the connection pad 154 formed at one end of the data transfer wire 152. One end is bonded to the voltage output wiring 225 and the other end is bonded to a predetermined portion of the voltage transmission wiring 158. Here, the voltage connection wire 265 is formed thicker than the data connection wire 255 to minimize the resistance.

Meanwhile, as illustrated in FIGS. 4 and 5, the driving circuit film 300 is a thin base film 310 having a thin thickness, and is mounted on a central portion of one surface of the film 310 and has first and second signal transmission lines. A drive drive IC 320 for generating a drive signal for driving the LCD panel 110 by using the data signals applied through the fields 150 and 160 and the first and second signals formed on the rear surface of the base film 310. Input leads 340a and b electrically connecting the transfer wires 150 and 160 and the drive drive IC 320, and input leads 144 formed in the drive drive IC 320 and the input pad bonding blocks 145a and b. And output leads 370 for electrically connecting the circuits.

The base film 310 is formed in a cap shape in which one side and the other side in the rectangular direction protrude by a predetermined length, and the size of the protruding portion 330 is about 1/2 of the length of the voltage transmission lines 158 and 168. When the raw film 300 is bonded to the first and second signal transmission wires 150 and 160 and the input pad bonding blocks 145a and b, they cover half of the voltage transmission wires 158 and 168.

In addition, the input pads 340 and 340a are divided into voltage input leads 350 and 350a and data input leads 360 and 360a, and the voltage input leads 350 and 350a and data input leads 360 and 360a. 4 is mirror-arranged with respect to the center line 325 in the width direction of the drive drive IC 320, and is positioned to be symmetrical to both sides with respect to the center line 325 of the drive drive IC 320. The voltage input leads 350 and 350a and the data input leads 360 and 360a are electrically connected to the inside of the driving drive IC 300.

Here, the voltage input leads 350 and 350a are formed along both edges in the width direction of the driving circuit film 300 so that one end is connected to the voltage transfer wiring 158 and 168 and the other end is formed in the center portion of the driving drive IC 320. It is connected to the input terminal. At one end of the input leads 350 and 350a for voltage, connection pads 358 are formed to be connected to the voltage transmission lines 158 and 168. The connection pads 358 are separated into at least two and formed on the protruding portion 330. In order to minimize the connection resistance by increasing the area of the connection pad 358 as much as possible, the connection pad 358 is formed in the longitudinal direction of the driving circuit film 300 to be perpendicular to the voltage input leads 350 and 350a.

Further, a plurality of data input leads 360 and 360a are formed to be spaced apart from each other by a predetermined interval between the voltage input leads 350 and 350a and one end in the longitudinal direction and the other end of the driving drive IC 320. One end of the 360 and 360a is connected to the data transfer wires 152 and 162 and the other end is connected to an input terminal of the driving drive IC 320. One end of the data input leads 360 and 360a is formed with a connection pad 365 bonded to the connection pads 154 and 155 of the data transmission lines 152 and 162.

On the other hand, a plurality of output leads 370 are formed between the data input leads (360, 360a) by a predetermined distance from each other, one end is bonded to the output terminal of the drive drive IC 320, the other end is the input pad bonding blocks (145, 145) Bonded to a), connection pads 374 connected to the input pads 144 are formed at the other ends of the output leads connected to the input pad bonding blocks 145 and 145a.

Lastly, as shown in FIG. 2, the backlight assembly 400 is installed on a mold frame 410 having a rectangular accommodating space 412 and a base sheet of the accommodating space 412 to reflect light upward. 420, the light guide plate 430 is installed on the upper surface of the reflective sheet 420 to emit light incident from the side to the upper direction to guide the light, the lamp unit coupled to the side of the light guide plate 430 to emit light 440, an optical sheet 450 installed on an upper surface of the light guide plate 430 and diffusing and condensing the light transmitted from the light guide plate 430 to increase the utilization efficiency of the light, and an upper portion of the optical sheets 450. It consists of a top chassis 460 coupled to the mold frame 410 to fix the LCD panel 110 installed on the surface.

Referring to the process of applying the data signal and the power supply voltage to each driving circuit film in the LCD module configured as described above are as follows.

First, when an initial driving signal such as a voltage, a data signal, a clock signal, or the like is applied to the auxiliary printed circuit board 200 in an external graphic system (not shown), the timing controller 210 mounted on the auxiliary printed circuit board 200 may be used. And after the control signal and the power supply voltage are generated using the initial driving signal in the voltage generator 220, these signals are output to the data output wiring 215 and the voltage output wiring 225 together with the data signals.

The data signal and the power supply voltage output to the data and voltage output wirings 215 and 225 are input to the connection pad 154 and the voltage transmission wiring 158 formed at one end of the data transmission wiring 152 through the connection film 250. In addition, the data transfer wire 152 and the voltage transfer wire 158 are applied to the driving circuit film 300a attached to the first of the LCD panel 110. The data signal and the power supply voltage are driven by the drive drive IC 320. The input line 350 and the data input lead 360 formed on the left side of the center line 325 with respect to the center line 325 are input to the driving drive IC 320.

At this time, the area of the voltage transmission wiring 158 bonded by bonding the voltage connection wiring 265 for transmitting the power supply voltage in the first signal transmission wiring 150 and the connection pad 365 of the voltage input lead 360 coexist. Because of this size, connection resistance is minimized.                     

As such, when a data signal and a power supply voltage are applied to the driving drive IC 320, the data formed on the right side of the driving drive IC 320 is based on the center line 325 of the driving drive IC 320 through a metal wiring formed therein. A drive that transfers a data signal and a power supply voltage to the input leads 360a and the voltage input lead 350a and drives the LCD panel 110 using the data signal and the control signal input to the driving drive IC 320. After generating the signal is sprayed on the LCD panel (110).

The data signal and the power supply voltage transmitted to the data input leads 360a and the voltage input lead 350a formed on the right side with respect to the center line 325 of the driving drive IC 320 are again inputted for data and voltage. The signal is transmitted to the second signal transmission line 160 through the 360a and 350a and input to the second driving circuit film 300b attached to the LCD panel 110.

As described above, the second signal transmission lines formed between the input pad bonding blocks, the input leads formed on the left side of the drive circuit film with respect to the center line, the input formed on the right side of the drive circuit film with respect to the drive drive IC and the center line. A data signal and a power supply voltage are supplied from the driving circuit film attached to the third of the LCD panel to the driving circuit film bonded to the end of the LCD panel while continuing the pads.

When the signal transmission lines 150 and 160 that transmit data signals and power supply voltages are formed separately on the LCD panel 110 and the driving circuit film 300, the lengths of the signal transmission lines 150 and 160 are shorter than in the related art, thereby reducing the resistance. .

 As described above, the present invention forms signal transmission wires for applying signals such as data and power voltage to each driving circuit film on the LCD panel and each driving circuit film, respectively. The area of the voltage transmission wiring for supplying the power voltage to the film is as large as possible in a given space, and the connection pads formed on the input leads for voltage of the driving circuit film and bonded to the voltage transmission wiring are formed in the longitudinal direction of the driving circuit film. Also make the area of the connection pad as large as possible.

Then, since the lengths of the signal transmission lines are shortened and the areas of the power transmission lines and the connection pads are increased, the resistance is reduced, so that the reliability of the liquid crystal display device can be improved.

In addition, since only the driving elements are mounted on the printed circuit board, the size is reduced and the number of layers constituting the printed circuit board is reduced, thereby reducing the manufacturing cost of the LCD module and reducing the size and thickness of the LCD module. have.

Claims (9)

A plurality of drive circuit films; A TFT substrate including input pads formed at one end of gate lines and data lines crossing each other and bonded to the driving circuit films, and a color filter substrate attached to the TFT substrate to expose the input pads. An LCD panel formed between input pads to which adjacent driving circuit films are bonded, the LCD panel including a first signal transmission line electrically connecting the adjacent driving circuit films; An auxiliary printed circuit board having driving elements mounted on one surface thereof to generate a signal including a data signal and a power supply voltage; A connection film connecting the auxiliary printed circuit board and the LCD panel to transfer the signal to the LCD panel; The drive circuit film A base substrate; A drive drive IC mounted on one surface of the base substrate to generate a drive signal; One end is connected to one end of the first signal transmission line and is connected to an input terminal of the drive drive IC, and the other end is connected to the other end of the first signal transmission line via the drive drive IC to connect the signal to an adjacent drive circuit. Input lead to transfer to the film; And An output lead formed on the rear surface of the base substrate, one end of which is connected to an output terminal of the driving drive IC, and the other end of which is bonded to the input pad to apply the driving signal generated by the driving drive IC to the LCD panel. LCD module, characterized in that configured. The LCD module of claim 1, further comprising a second signal transmission line electrically connecting the connection film and the driving circuit film. 3. The circuit of claim 2, wherein the first and second signal transfer lines are data transfer lines for transmitting the data signal to each of the driving circuit films, and voltage transfer lines for applying a power supply voltage to each of the driving circuit films. LCD module, characterized in that configured. The data transmission wiring line of claim 3, wherein the data transmission wiring line is formed in a “상” shape in which a portion in which the driving circuit film is bonded is opened on a quadrangle, and an input lead of the driving circuit film is bonded at both ends of the data transmission wiring line. LCD module, characterized in that the connection pad is formed. The method of claim 3, wherein the voltage transmission line bonded to the voltage input lead of the driving circuit film is formed adjacent to the data signal transmission line formed on the innermost of the data signal transmission lines, the maximum area in a given space LCD module characterized in that formed in the shape of a rectangle. The LCD panel of claim 1, wherein the first and second signal transmission lines formed at one end of the LCD panel in which the gate lines extend are formed together with the gate lines, and wherein the data lines extend. And the first and second signal transmission lines formed at one end in a width direction together with the data lines. The LCD module of claim 1, wherein the base substrate has a cap shape in which both ends of one side bonded to the LCD panel are protruded to a predetermined length in a quadrangular shape, and the protrusion is attached to the voltage transmission line. The driving circuit of claim 1, wherein the input lead comprises a data input lead and a voltage input lead, and the data and voltage input leads are arranged in mirrors on both sides of the driving drive IC in a width direction with respect to the center of the driving drive IC. And the input leads positioned at symmetrical portions of the driving modules are electrically connected to the inside of the driving drive IC. The method of claim 8, wherein the voltage input lead is formed along both edges of the driving circuit film, one end of the voltage input lead is formed with a connection pad connected to the voltage transfer wiring, the connection pad is And an LCD module formed in a direction perpendicular to the voltage input lead.

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