KR20190081251A - Display device - Google Patents

Abstract

According to the present invention, it is possible to electrically connect first and second source printed circuit boards spaced apart from each other through first and second conductive protrusion parts and a conductive layer. Accordingly, a flexible flat cable (FFC) for connecting the first and second source printed circuit boards to each other can be eliminated, thereby simplifying processes and reducing costs. Furthermore, since signal wiring, power wiring and the like can be formed in the conductive layer, the widths of the first and second source printed circuit boards can be reduced.

Description

Display device {DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device capable of simplifying a process and reducing manufacturing costs.

2. Description of the Related Art In recent years, as the society has become a full-fledged information age, a display field for processing and displaying a large amount of information has rapidly developed, and various flat panel displays (FPDs) Examples of the flat panel display include a liquid crystal display (LCD) device, a plasma display panel (PDP) device, and an organic light emitting diode (OLED) device. .

The display device internally includes various constituent devices, which can be electrically connected by a cable.

A flexible flat cable (FFC) is mainly used as a cable for connecting the components.

Recently, as the size of a display device has been increased, the number of data lines and source COFs (chip on films) has been increased, thereby increasing the size of the source printed circuit board. In order to solve the difficulties of alignment, the source printed circuit board is divided and arranged.

Accordingly, a plurality of divided source printed circuit boards are disposed on the display device, and a plurality of source printed circuit boards are connected to each other via a flexible flat cable (FFC) for transmitting voltage and signals from the control board. Flat cable) and connector.

This structure overcomes the difficulty of aligning the source printed circuit board and the source COF, but adds a process of connecting a plurality of source printed circuit boards to each other through a flexible flat cable and a connector, .

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and it is an object of the present invention to reduce the width of a source printed circuit board by connecting a plurality of source printed circuit boards through a tape pad including a conductive layer, There is a problem in providing a display device which can be reduced.

According to an aspect of the present invention, there is provided a display apparatus including a display panel, a tape pad disposed on a back surface of the display panel and including first and second conductive protrusions spaced from each other, And a first and a second printed circuit board each including a copper foil layer exposed portion, wherein the first and second conductive protrusions respectively contact the copper foil layer exposed portions of the first and second printed circuit boards, 1, 2 A printed circuit board is electrically connected to a display device.

The tape pad may include a first insulating layer in contact with the back surface of the display panel and a conductive layer disposed on the first insulating layer. The first and second conductive protrusions may be formed on the conductive layer, Can be contacted.

In addition, the tape pad may further include a second insulating layer covering the conductive layer, and the second insulating layer may include an opening region exposing a part of the first and second conductive protrusions.

Here, the first and second conductive protrusions may protrude from the upper surface of the second insulating layer.

In addition, an adhesive layer may be further formed on the second insulating layer.

Here, the first and second conductive protrusions may be formed of a conductive double-sided tape or ACF (Anisotropic Conductive Film).

The apparatus may further include a control board connected to at least one of the first and second printed circuit boards.

Further, the flexible printed circuit board may further include a flexible flat cable (FFC) connecting the first and second printed circuit boards to each other.

The display device may further include a flexible printed circuit connecting the display panel and the first and second printed circuit boards.

Here, a drive IC (integrated circuit) may be mounted on the flexible printed circuit.

In the present invention, a plurality of source printed circuit boards are connected to each other through a tape pad including a conductive layer, thereby reducing the width of the source printed circuit board, simplifying the process, and reducing manufacturing costs.

1 is a view schematically showing a structure of a display device according to an embodiment of the present invention.
2 is a schematic view showing a back surface of a display device according to an embodiment of the present invention.
3 is a cross-sectional view taken along line III-III 'of FIG.
4 is a cross-sectional view taken along line IV-IV 'of FIG. 2;
FIG. 5 is a schematic view illustrating a supply of signals and power to a printed circuit board of a display device according to an embodiment of the present invention.
6 is a view schematically showing a modification of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiments of the present invention can be applied to all kinds of display devices. Hereinafter, an EL display device will be described as an example for convenience of explanation.

1 is a view schematically showing a structure of a display device according to an embodiment of the present invention.

As shown in FIG. 1, a display device 100 according to an embodiment of the present invention includes a display panel 150 for realizing an image, a display panel 150 for receiving various signals from an external system to generate control signals, A gate driver 120 for generating a gate driving voltage VG under the control of the timing controller 120 and a data driver 130 for generating a data voltage VDATA, And a power supply unit 140 for supplying a power supply voltage and other driving voltages.

Here, a plurality of gate lines GL and a plurality of data lines DL may be arranged in a matrix form on the transparent substrate on the display panel 150.

The gate line GL is connected to the gate driver 120 and the data line DL is connected to the data driver 130. A pixel PXL may be defined at an intersection of the lines.

The pixel PXL is connected to the power supply line PL connected to the output terminal of the data driver 130. Although not shown, each pixel PXL is also connected to a wiring (not shown) for supplying the ground voltage ELVSS.

Each pixel PXL may include at least one thin film transistor (TFT), a light emitting diode, and a capacitor.

According to this structure, the display panel 150 has a thin film transistor connected to the signal input to each wiring, a data voltage VDATA according to the gradation is applied to each pixel, a current corresponding to the data voltage VDATA The light is emitted to the light emitting diode to realize an image.

The timing control unit 110 includes a plurality of video chips, a video controller, a CPU, and the like to receive data (RGB) for an image to be displayed from the external system, a horizontal synchronizing signal H for controlling each driving unit, (V) and a clock signal (CLK).

In response to the timing signals supplied from the external system, the timing controller 110 may generate various control signals for driving the gate driver 120 and the data driver 130, which will be described later, and supply the control signals to the drivers 120 and 130.

The gate driver 120 may supply the gate driving voltage VG to the plurality of pixels PXL arranged on the display panel 150 in response to the gate control signal GCS input from the timing controller 110. [

The output terminal of the gate driver 120 is connected to the gate line GL of the display panel 150 and outputs the gate driving voltage VG to sequentially output the pixel PXL in one horizontal period 1H, The data voltage VDATA output from the data driver 130 to the display panel 150 is applied to each pixel PXL by turning on the switching transistor provided in the pixel PXL.

The data driver 130 arranges the input image data RGB corresponding to the data control signal DCS input from the timing controller 110 and selects a reference voltage corresponding to the image data to generate an analog data voltage Can be converted.

Here, the data voltage may be latched by one horizontal period (1H) and supplied to the display panel 150 simultaneously through all the data lines DL.

The power supply 140 supplies a driving voltage and a reference voltage to the gate and data drivers 120 and 130.

Here, the driving voltage includes a gate high voltage VGH and a gate low voltage VGL of the gate driving voltage VG, a power supply voltage ELVDD and a ground voltage ELVSS of the light emitting diode OLED.

The timing controller 110 controls the gate driver 120 according to a timing signal supplied from an external system to generate a gate driving voltage to enable pixels on the display panel 150, Voltage to the pixel. Accordingly, the display panel 150 implements the image.

2 is a schematic view showing a back surface of a display device according to an embodiment of the present invention.

2, the display device 100 according to the embodiment of the present invention includes a display panel 150, a flexible printed circuit 170 connected to one side of the display panel 150, a flexible printed circuit A printed circuit board 180 connected to the printed circuit board 180 and a tape pad 190 disposed on the back surface BS of the display panel 150 and a control board CB connected to the printed circuit board 180.

Here, the flexible printed circuit 170 may be connected to the back surface BS of the display panel 150. For example, the flexible printed circuit 170 is bonded to the back face BS of the display panel 150 in a reverse direction so that the flexible printed circuit 110 is not bent back, but on the back face BS of the display panel 150 And can be arranged flat.

Thus, stress and cracking problems that occur when the flexible printed circuit 170 is excessively tilted can be prevented.

 The flexible printed circuit 170 may be a chip on film (COF) or a tape carrier package (TCP) on which a drive IC (integrated circuit) 17 is mounted, but is not limited thereto.

The drive IC 173 mounted on the flexible printed circuit 170 may be a source drive IC. However, the present invention is not limited thereto and may be a gate drive IC.

One end of the flexible printed circuit 170 may be connected to the display panel 150 and the opposite end of the flexible printed circuit 170 may be connected to a printed circuit board 180.

One end of the flexible printed circuit 170 and the display panel may be connected through an ACF (Anisotropic Conductive Film), and the opposite end of the flexible printed circuit 170 and the printed circuit board 180 may be connected through an ACF or a connector have.

Here, the printed circuit board 180 may be a source printed circuit board. However, the present invention is not limited thereto, and it may be a gate printed circuit board.

Hereinafter, a case where the drive IC 173 is a source drive IC and the printed circuit board 180 is a source printed circuit board will be described as an example.

The source printed circuit boards 180 may be spaced apart from one another and disposed in a plurality of locations. A plurality of flexible printed circuits 170 may be connected to each of the source printed circuit boards 180.

Here, the source printed circuit board 180 may comprise a copper foil layer. For example, it may be composed of a copper foil layer and a cover shield layer disposed on the upper and lower surfaces of the copper foil layer.

The copper foil layer may be formed of a plurality of layers, and signal wiring and power wiring may be disposed in the copper foil layer.

In particular, the source printed circuit board 180 of the display device 100 according to an embodiment of the present invention may include a copper foil layer exposed portion.

That is, a portion of the cover shield layer of the source printed circuit board 180 may be removed to form a copper foil layer exposing portion that exposes the copper foil layer.

The exposed portion of the copper foil layer will be discussed in detail later.

A tape pad 190 may be disposed on the back surface BS of the display panel 150.

A plurality of source printed circuit boards 180 are mounted on the tape pads 190 and a plurality of source printed circuit boards 180 are connected to the back surface BS of the display panel 150 by the tape pads 190. [ So that it can be stably fixed.

The tape pad 190 may be formed larger than the source printed circuit board 180. For example, the width d2 of the tape pad 190 may be made larger than the width d1 of the source printed circuit board 180, The circuit board 180 can be seated.

In particular, the tape pad 190 of the display device 100 according to an embodiment of the present invention may include a conductive layer and may be formed using a conductive layer of the tape pad 190, So that the circuit board 180 can be electrically connected.

As a result, a flexible flat cable and a connector for connecting a plurality of source printed circuit boards 180 to each other can be eliminated.

The connection relationship between the tape pad 190 and the plurality of source printed circuit boards 180 will be described in more detail below.

In addition, the present invention may include a control board CB connected to the source printed circuit board 180.

The timing control unit 110 and the power supply unit 140 may be disposed in the control board CB.

The timing control unit 110 of the control board CB receives the digital video data and the timing signal of the input image from the external host system and transmits the digital video data to the source drive IC 173. [

The timing controller 110 generates a small timing control signal for controlling the operation timing of the source drive ICs 173 by using the timing signal received from the external host system and an operation timing of the gate drive IC (not shown) Lt; RTI ID = 0.0 > timing control < / RTI >

The gate timing signals may include a gate start pulse (GSP), a gate output enable signal (GOE), a gate shift clock (GSC), and the like.

Here, the host system may be implemented as any one of a television system, a home theater system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer, and a phone system.

Then, the host system scales the digital video data of the input image according to the resolution of the display panel. The host system may transmit the timing signals to the timing controller 110 together with the digital video data of the input image.

The power supply unit 140 may receive a DC input voltage using a power supply circuit such as a DC-DC converter and a regulator to generate a power source necessary for driving the display panel.

For example, the power supply unit 140 may output the gate high voltage VGH, the gate low voltage VGL, the gamma compensation voltage, the pixel power supply voltage ELVDD, and the like.

Such a control board CB may be connected to the source printed circuit board 180 through a flexible circuit cable, for example, a flexible flat cable (FFC) and a connector.

The digital video data, the source timing control signal, and the gamma compensation voltage of the input image output from the control board CB are supplied to the source drive ICs (not shown) through the flexible flat cable (FFC) and the source printed circuit board 180 and the tape pad 190 (173), respectively.

3 is a cross-sectional view taken along line III-III 'of FIG.

The first and second source printed circuit boards 180a and 180b disposed on the tape pad 190 and the tape pad 190 that are in contact with the back surface BS of the display panel 150, Respectively.

The tape pad 190 includes a first insulating layer 191 contacting the back surface BS of the display panel 150, a conductive layer 193 disposed on the first insulating layer 191, And a second insulating layer 195 covering the second insulating layer 193.

In particular, the second insulating layer 195 of the tape pad 190 of the display device (100 of FIG. 2) according to an embodiment of the present invention includes a plurality of opening areas OP for exposing the conductive layer 193 .

The conductive protrusions PP may be disposed in each of the plurality of opening regions OP of the second insulating layer 195.

Here, the conductive protrusions PP may be respectively in contact with the conductive layers 193 on the lower surfaces thereof. Thus, the conductive layer 193 and the conductive protrusion PP can be electrically connected to each other.

Each of the conductive protrusions PP may be protruded from the second insulating layer 195. That is, the upper surface of the conductive protrusion PP may be formed higher than the upper surface of the second insulation layer 195. This makes it possible to improve the contactability between the copper foil layer exposed portion CR of each of the first and second source printed circuit boards 180a and 180b and the conductive protrusion PP.

Further, the conductive protrusion PP may be made of a conductive double-sided tape or ACF (Anisotropic Conductive Film).

An adhesive layer (not shown) may further be formed on the upper surface of the second insulating layer 195. In this case, the upper surface of the conductive protrusion PP may be formed higher than the upper surface of the adhesive layer.

Each of the first and second source printed circuit boards 180a and 180b includes first and second cover shield layers 181 and 185 and a copper foil layer 180 disposed between the first and second cover shield layers 181 and 185, (183).

Here, the copper foil layer 183 may be formed of a plurality of layers.

A plurality of signal wirings and power supply wirings may be formed in the copper foil layer 183.

Particularly, the first and second source printed circuit boards 180a and 180b of the display device (100 of FIG. 2) according to the embodiment of the present invention are formed by forming a copper foil layer exposed portion CR for exposing the copper foil layer 183 .

That is, at least one of the first cover shield layer 181 may be partially removed to expose the copper foil layer 183.

The copper foil layer exposed portions CR of each of the first and second source printed circuit boards 180a and 180b may be in contact with the upper surface of the conductive protrusion PP of the tape pad 190. [

For example, the first conductive protrusion PP1 formed on the tape pad 190 may contact the copper foil layer exposed portion CR of the first source printed circuit board 180a, and the second conductive protrusion PP2 may contact the copper foil layer exposed portion CR of the first source printed circuit board 180a. And may contact the copper foil layer exposed portion CR of the second source printed circuit board 180b.

The first and second source printed circuit boards 180a and 180b are electrically connected to the copper foil layer exposed portion CR, the first and second conductive protrusions PP1 and PP2, (193). ≪ / RTI >

Thus, a cable for connecting the first and second source printed circuit boards 180a and 180b to each other, for example, a flexible flat cable and a connector can be eliminated, thereby simplifying the process The cost can be reduced.

Further, signal wirings, power supply wirings, and the like can be formed on the conductive layer 193, so that the widths of the first and second source printed circuit boards 180a and 180b can be reduced.

Although the first and second source printed circuit boards 180a and 180b are illustrated as an example in FIG. 3, the present invention is not limited thereto. The conductive layer 193 of the tape pad 190 of the present invention, A plurality of source printed circuit boards of three or more can be electrically connected using the copper foil layer PP and the copper foil layer exposed portion CR of the source printed circuit.

4 is a cross-sectional view taken along line IV-IV 'of FIG. 2;

As shown in FIG. 4, a flexible printed circuit 170 may be connected to the back surface BS of the display panel 150. For example, the flexible printed circuit 170 is bonded to the back face BS of the display panel 150 in a reverse direction so that the flexible printed circuit 110 is not bent back, but on the back face BS of the display panel 150 And can be arranged flat.

Thus, stress and cracking problems that occur when the flexible printed circuit 170 is excessively tilted can be prevented.

The flexible printed circuit 170 may be a chip on film (COF) or a tape carrier package (TCP) on which a drive IC (integrated circuit) 173 is mounted, but is not limited thereto.

One end of the flexible printed circuit 170 may be connected to the display panel 150 and the opposite end of the flexible printed circuit 170 may be connected to the source printed circuit board 180.

One end of the flexible printed circuit 170 and the display panel may be connected through an ACF (Anisotropic Conductive Film), and the opposite end of the flexible printed circuit 170 and the source printed circuit board 180 are connected through an ACF or a connector .

A tape pad 190 may be disposed on the back surface BS of the display panel 150 so that the source printed circuit board 180 is stably fixed to the back surface BS of the display panel 150 by the tape pad 190. [ As shown in Fig.

The tape pad 190 has a first insulating layer 191 that contacts the back surface BS of the display panel 150 and a conductive layer 193 and a conductive layer 193 on the first insulating layer 191 And a second insulating layer 195 covering the second insulating layer 195.

In particular, the second insulating layer 195 of the tape pad 190 of the display device (100 of FIG. 2) according to an embodiment of the present invention includes a plurality of opening areas OP for exposing the conductive layer 193 .

The conductive protrusions PP may be disposed in each of the plurality of opening regions OP of the second insulating layer 195.

Here, the conductive protrusions PP may be respectively in contact with the conductive layers 193 on the lower surfaces thereof. Thus, the conductive layer 193 and the conductive protrusion PP can be electrically connected to each other.

The second insulating layer 195 and the conductive protrusion PP may have a stepped portion so that the conductive protrusion PP protrudes from the second insulating layer 195.

Further, an adhesive layer (not shown) may be further disposed on the upper surface of the second insulating layer 195. In this case, the conductive protrusion PP may have a stepped portion with the adhesive layer and may have a protruding shape in the adhesive layer.

The source printed circuit board 180 and the tape pad 190 can be more stably fixed through the adhesive layer and the conductive protrusions PP and the source printed circuit board 180 are electrically connected through the step of the adhesive layer and the conductive protrusion PP, The contactability of the exposed portion of the copper foil layer CR can be improved.

The source printed circuit board 180 may include first and second cover shield layers 181 and 185 and a copper foil layer 183 disposed between the first and second cover shield layers 181 and 185 .

Here, the copper foil layer 183 may be formed of a plurality of layers.

A plurality of signal wirings and power supply wirings may be formed in the copper foil layer 183.

Particularly, the source printed circuit board 180 of the display device (100 of FIG. 2) according to the embodiment of the present invention may be formed with a copper foil layer exposed portion CR that exposes the copper foil layer 183.

That is, at least one of the first cover shield layer 181 may be partially removed to expose the copper foil layer 183.

Then, the copper foil layer exposed portion CR of the source printed circuit board 180 may contact the conductive protrusion PP of the tape pad 190. [

Through such a structure, the source printed circuit board 180 and the conductive protrusions PP1 and PP2 and the conductive layer 193 can be electrically connected to each other.

FIG. 5 is a schematic view illustrating a supply of signals and power to a printed circuit board of a display device according to an embodiment of the present invention.

2, the signal S and the power P applied from the control board (CB in FIG. 2) are applied to the tape pad 190, To the neighboring source printed circuit boards 180a and 180b by the conductive protrusion PP and the conductive layer 193 of the source PCB.

For example, a signal S such as digital video data, a source timing control signal, and the like of an input image applied from a timing control section (110 in FIG. 2) of a control board (CB in FIG. 2) The power source P necessary for driving the display panel 150 to be applied to the second source PCB 180b may be input to the second source PCB 180b.

The signal S and the power source P inputted to the second source printed circuit board 180b are transmitted to the conductive layer 193 through the second conductive projection PP2, And may be transmitted to the first source printed circuit board 180a through the conductive protrusion PP1.

Accordingly, the flexible flat cable and connector for connecting the first and second source printed circuit boards 180a and 180b to each other can be eliminated, thereby simplifying the process and reducing the cost.

Further, signal wirings, power supply wirings, and the like can be formed on the conductive layer 193, so that the widths of the first and second source printed circuit boards 180a and 180b can be reduced.

6 is a view schematically showing a modification of the present invention.

6, a display device 200 according to a modification of the present invention includes digital video data of a video input from a timing control unit 210 of a control board CB, a signal such as a source timing control signal, (C) connecting the neighboring source printed circuit board (280) to transmit the source printed circuit board (S).

Here, the cable C may be a flexible flat cable (FFC).

That is, in the modification of the present invention, the power source P necessary for driving the display panel 250 applied from the power source unit 240 of the control board CB is connected to the conductive protrusions of the tape pad 290 (PP in FIG. 5) The digital video data, the source timing control signal, and the like of the input image, which is applied from the timing control unit 210 of the control board CB, are transmitted to the neighboring source printed circuit board 280 by the conductive layer The signal S of the source printed circuit board 280 can be transmitted to the neighboring source printed circuit board 280 via the cable C. [

The first flexible flat cable FFC1 for supplying the signal S from the control board CB to the source printed circuit 280 and the second flexible flat cable FFC2 for supplying the voltage P . However, the present invention is not limited thereto, and the first and second flexible flat cables FFC1 and FFC2 for supplying the signal S and the power source P may be integrated.

As described above, the power source P and the signal C supplied from the control board CB of the modified embodiment of the present invention can be transmitted as a dual route between the plurality of source printed circuit boards 280.

5) of the tape pad 290 and the conductive layer (FIG. 5, 193) of the source printed circuit board 280, , And a cable (C) connecting the neighboring source printed circuit board (280).

Thus, the transfer of power P between neighboring source printed circuit boards 280 utilizes a first route, and the transfer of signal S between neighboring source printed circuit boards 280 is accomplished by using a second route , The noise due to the interference of the signal S can be reduced.

The transfer of the power P between the neighboring source printed circuit boards 280 utilizes the second route and the transfer of the signal S between the neighboring source printed circuit boards 280 is accomplished using the second route, 1 route.

 Thus, the display device 100, 200 according to the embodiment of the present invention includes the source printed circuit boards 180, 280 including the conductive protrusions PP of the tape pads 190, 290 and the copper foil layer exposed portion CR The signal S and the power source P can be transmitted in various forms through the structure of the display device 100 and 200 to increase the degree of freedom of design of the display device 100 and 200.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

150: display panel BS: rear surface of the display panel
180a: first source printed circuit board 180b: second source printed circuit board
181: first cover shield layer 183: copper foil layer
185: second cover shield layer 190: tape pad
191: first insulating layer 193: conductive layer
195: second insulating layer PP: conductive protrusion
OP: opening region CR: copper foil layer exposed portion

Claims (10)

Display panel;
A tape pad disposed on a back surface of the display panel and including first and second conductive protrusions spaced from each other;
A first and a second printed circuit board disposed on the tape pad, each including a copper layer exposed portion,
Lt; / RTI >
Wherein the first and second conductive protrusions respectively contact the copper foil layer exposed portions of the first and second printed circuit boards to electrically connect the first and second printed circuit boards.
The method according to claim 1,
Wherein the tape pad includes a first insulating layer in contact with a rear surface of the display panel and a conductive layer disposed on the first insulating layer, the first and second conductive protrusions being in contact with the conductive layer Display device.
3. The method of claim 2,
Wherein the tape pad further comprises a second insulating layer covering the conductive layer,
And the second insulating layer includes an opening region for exposing a part of the first and second conductive protrusions.
The method of claim 3,
And the first and second conductive protrusions protrude from the upper surface of the second insulating layer.
The method of claim 3,
And an adhesive layer on the second insulating layer.
The method according to claim 1,
Wherein the first and second conductive protrusions are made of a conductive double-sided tape or ACF (Anisotropic Conductive Film).
The method according to claim 1,
And a control board connected to at least one of the first and second printed circuit boards.
The method according to claim 1,
And a flexible flat cable (FFC) connecting the first and second printed circuit boards to each other.
The method according to claim 1,
And a flexible printed circuit connecting the display panel and the first and second printed circuit boards.
10. The method of claim 9,
And a drive IC (integrated circuit) mounted on the flexible printed circuit.

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