KR20080055296A - Flat panel display - Google Patents

Abstract

A flat panel display is provided to prevent a malfunction of a display by enhancing the yield of production and reliability. A pixel member(320) is formed on a substrate(310). A pad member is located on the substrate, connected with the pixel member electrically and transmits the driving signal. The pad member includes data pads or scan pads arranged by plural rows. The pad member is located at a side or both sides of the substrate. A connection member is formed on a partial area of the flat panel display and includes a lead member. The lead member includes leads connected with the data pads or scan pads electrically. The lead member is located at the side of both sides of the connection member. The pads of the pad members are connected with the pixel member through lines. The leads of the lead member are connected with a driving circuit member through lead lines. A portion of the lead lines is arranged at the first surface of the connection member and the remnant is arranged at the second surface opposite to the first surface.

Description

Flat Panel Display {Flat Panel Display}

1 is a schematic diagram showing a pad portion structure of a substrate and a connection portion of a conventional flat panel display device;

2 is a schematic diagram illustrating a pad portion structure of a substrate and a connection portion of a flat panel display device according to an exemplary embodiment of the present invention.

3A and 3B are schematic views showing the structure of a lead portion and lead wirings of the connecting portion of FIG. 2.

Explanation of the main symbols in the drawings

310: substrate 320: pixel portion

325: wiring portion 325a: data wiring

325b: scan wiring 350: pad portion

350a, 350b: Pad 410: Connection

420: drive circuit section 425a, 425b: first and second lead wirings

450: lead portion 450a, 450b: lead

The present invention relates to a flat panel display.

Recently, the importance of flat panel displays (FPDs) has increased with the development of multimedia. In response to this, various types of flat panels such as liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), and flat emitting displays (Light Emitting Displays) The display is put to practical use.

Among them, the liquid crystal display (LCD) has advantages of better visibility than the cathode ray tube, and an average power consumption and a small amount of heat generation. In particular, the flat panel display has a high response time with a response speed of 1 ms or less, low power consumption, and wide light viewing angle due to self-luminous.

In the flat panel display device as described above, a pixel portion including a light emitting layer or a liquid crystal layer interposed between two electrodes is formed on a substrate to realize a predetermined image.

In addition, a data pad portion and a scan pad portion that are electrically connected to two electrodes of the pixel portion, respectively, and transmit a driving signal are formed on the substrate.

On the other hand, the connection portion electrically connected to the data pad portion and the scan pad portion on the substrate, for example, a plurality of pads were located on the film formed of polyimide. The plurality of pads are electrically connected to each other through lead wires and an integrated circuit (IC) that controls a driving signal applied to the pixel portion.

Each of the pads of the data pad, the scan pad, and the connection part as described above are disposed to face each other, and then bonded with heat and pressure.

In this bonding process, when the pitch between the pads on the substrate or the pads on the connecting portion is too small or the film of the connecting portion is irregularly drawn, the pads of the pad portion and the pads of the lead portion have mismatched.

Such mismatches between pads have deepened as the size of the flat panel display increases, the number of pads increases, and the pitch between pads decreases.

In addition, a short occurred when the pads of the connection overlapped over two pads on the substrate with a mismatch.

1 is a schematic diagram illustrating a pad portion structure of a substrate and a connection portion of a conventional flat panel display device.

Referring to FIG. 1, the pixel part 120 is positioned on the substrate 110. Although not shown, the pixel unit 120 may include a plurality of subpixels, and the subpixels may have a structure in which a light emitting layer is interposed between two electrodes.

One side of the substrate 110 includes a pad unit 150 including data pads and scan pads 150a and 150b electrically connected to the pixel unit 120 through the wiring unit 125.

The wiring unit 125 includes data wires 125a for transmitting a data signal to the pixel unit 120 and a plurality of scan wires 125b for transmitting a scan signal to the pixel unit 120.

On the other hand, the connection portion 210 that is electrically connected to the pad unit 150 has a plurality of leads 250a electrically connected to the data pads and the scan pads 150a and 150b of the pad unit 150 on one side thereof. The lead part 250 including the was positioned. The leads 250a of the lead unit 250 are electrically connected to the driving circuit unit 220 that controls the driving signal through the lead wires 225.

The substrate 110 and the connection unit 210 as described above are arranged so that the pads 150a and 150b of the pad unit 150 and the leads 250a of the lead unit 250 face each other, and then heat and pressure are increased. Was added and cemented.

In this bonding process, the pitch D1 between the pads 150a and 150b of the pad unit 150 or the pitch D2 between the leads 250a of the lead unit 250 is too small, or the lead unit 250 is formed. If a portion of the connection portion 210 is located irregularly stretched by heat and pressure, between the pads (150a) of the pad portion 150 and the pads (250a) of the lead portion 250 is electrically many A (N: 1) response was established that could lead to short problems. For example, any one of the leads 250a of the lead part 250 is in contact with two pads at the same time between some of the pads 150a and 150b of the pad part 150, thereby providing pads 150a or 150b. ), A short occurred between them. This short problem caused the display to malfunction and degraded the production yield and reliability of the flat panel display.

Therefore, the minimum pitch (D1 or D2) should be maintained to prevent short between pads, which is limited to the size reduction of the flat panel display with the bezel area (∑ (D1 + D3) or ∑ (D2 + D4)). This significantly affected the added value of the flat panel display.

Accordingly, an object of the present invention is to provide a flat panel display device which overcomes the process limitations of the prior art, prevents malfunction of the display, and improves production yield, reliability, and added value of the product.

In order to achieve this object, the present invention provides a substrate, a pixel portion formed on the substrate, and positioned on the substrate, and electrically connected to the pixel portion to transmit a driving signal, wherein at least one of the two is arranged in a plurality of rows. Provided is a flat panel display including a pad unit including data pads or scan pads.

The data pads may be arranged in multiple rows.

On the other hand, the pad portion may be located on one side of the substrate.

In another aspect, the pad portion may be located on both sides of the substrate.

The flat panel display device may include a connection part including a lead part including leads electrically connected to data pads and scan pads on a portion of the area.

On the other hand, the lead portion may be located on one side of the connecting portion.

In another aspect, the lid can be located on both sides of the connection.

The pad unit may match columns between pads of adjacent rows.

The flat panel display includes a connection part including a lead part electrically connected to the pad part on a partial region, and the lead part includes leads arranged in a plurality of rows and correspondingly connected to pads of the pad part. They can match columns between neighboring rows.

Pads of the pad portion may be electrically connected to the pixel portion through wires.

Leads of the lead portion are connected through a driving circuit portion and lead wires for controlling a driving signal applied to the pixel portion, some of the lead wires are disposed on the first side of the connecting portion, and the other side is a second side opposite to the first side. Can be placed in.

The pixel unit may include an organic emission layer between two electrodes.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

2 is a schematic diagram illustrating a pad part structure of a substrate and a connection part of a flat panel display device according to an exemplary embodiment of the present invention.

3A and 3B are schematic views showing the structure of the lead portion and the lead wiring of the connection portion of FIG. 2.

2, in the electroluminescent device according to an embodiment of the present invention, the pixel unit 320 is positioned on the substrate 310. Although not shown, the pixel unit 320 may include a plurality of sub pixels, and the sub pixels may have a structure in which a light emitting layer is interposed between two electrodes.

The pad part 350 including the data pads 350a and the scan pads 350b electrically connected to the pixel part 320 through the wiring part 325 is disposed at one side of the substrate 310.

The wiring unit 325 includes data wires 325a for transmitting a data signal to the pixel unit 320, and a plurality of scan wires 325b for transmitting a scan signal to the pixel unit 320.

The pad unit 350 may include two pads 350a and 350b in two rows, and the number of rows of the pads 350a and 350b may be 1/2 of the total number of the pads 350a and 350b.

As such, the arrangement of the pad portion 350 in which the number of pad rows is reduced can minimize the bezel area. (∑ (D1 + D3)-> ∑ (D5 + D6); 1 / 2∑ (D1 + D3) ≤ ∑ (D5 + D6) <∑ (D1 + D3))

As shown in FIG. 2, in the structure of the pad unit 350, columns may be coincident between adjacent rows of the pads 350a and 350b, and in this case, the reduction effect of the bezel area may not match. Can be further increased.

In addition, the flat panel display device according to the exemplary embodiment of the present invention having the pad portion 350 structure as described above may have a pad having a larger area in the same area on the substrate than the flat panel display device according to the prior art. The greater conductivity between the pad portion 350 and the lead portion 450 is secured, thereby enabling more efficient signal transmission. In addition, when the area of each pad is the same as before, the pitch between the pads can be kept wider, which can solve the short problem between the pads.

As described above, for example, the number of rows of pads 350a and 350b of the pad unit 350 is 1/2 of the total number of pads 350a and 350b. However, the number of pad rows of the pad unit of the present invention is limited thereto. The number of pad rows may be greater or less depending on the electrical connection state between the wirings.

In addition, in the exemplary embodiment of the present invention, the pads 350a and 350b and the wirings 325a and 325b are disposed on only one side of the substrate 310, for example. 350b) and the wirings 325a and 325b. Accordingly, the pads 350a and 350b may be disposed on both sides of the substrate 310, and thus the wirings 325a and 325b may be distributed on both sides of the substrate 310. When the pads 350a and 350b and the wirings 325a and 325b are distributed on both sides of the substrate 310, one side of the pad 350a and 350b and the space for preventing short between the pads 350a and 350b can be reduced. It is much more advantageous than just being placed on the face.

When the abnormal pixel portion 320 includes a plurality of sub-pixel rows (not shown), the wirings 325a and 325b may have each sub of the pixel portion 320 from the pad portion 350 according to various patterns of the present invention. A long path to the pixel columns may be first connected to a pad of the pad unit 350 positioned relatively closer to the pixel unit 320. For example, when the first and second wirings electrically connect a pixel portion including two sub-pixel columns and a pad portion including pads arranged in two rows and one columns, the first and second wirings are positioned relatively far from the pad portion. The first wiring connected to the subpixel column of the first row may be connected to the pad located in the first row and the first column of the pad part, and the second wiring connected to the subpixel column of the second row may be connected to the pad located in the first row and the second column of the pad part. have. Such a wiring structure can solve the luminance imbalance problem on the pixel part 320 due to the difference in wiring resistance between the wirings.

Referring to FIGS. 3A and 3B illustrating an enlarged view of region B on FIG. 2, the structure of the connection unit 410 will be described as follows. FIG. 3A illustrates structures of the leads 450a and 450b and the first lead wires 425a on the first side of the connecting portion 410, and FIG. 3B illustrates the second surface on the second side, which is the opposite side of the first side of the connecting portion 410. The structure of the two lead wiring 425b is shown.

The connection part 410 electrically connected to the pad part 350 has a plurality of leads 450a and 450b arranged in two rows to be electrically connected to the pads 350a and 350b of the pad part 350 on one side thereof. A lead portion 450 including) is positioned.

The leads 450a and 450b of the lead unit 450 are electrically connected to the driving circuit unit 420 for controlling the driving signal through the first and second lead wires 425a and 425b. In detail, the leads 450a of the first row of the lead unit 450 are electrically connected to the first lead wires 425a disposed on the first surface of the connection unit 410, and the leads of the second row of the leads 450a may be connected to each other. The 450b is electrically connected to the second lead wires 425b disposed on the second surface that is the opposite side to the first surface.

The second lead wires 425b disposed on the second surface are connected to the pads 450b in the second row through the first via hole H1, and the driving circuit unit 420 through the second via hole H2. Can be connected.

As such, the arrangement structure of the first and second lead wires 425a and 425b separately disposed on both sides of the film 410 is larger than that of the connection part according to the related art having the same number of pads. This can reduce the size limit of the panel to which the connection 400 is applied.

The substrate 310 and the connection portion 410 as described above are disposed so that the pads 350a and 350b of the pad portion 350 and the leads 450a and 450b of the lead portion 450 face each other, and then heat and pressure. Is added and cemented.

The pads 350a and 350b and the leads 450a and 450b in the pad portion 350 and the lead portion 450 of the connection portion 410 on the substrate 310 according to the exemplary embodiment of the present invention, respectively. Although columns have been described with reference to a case in which columns are arranged between neighboring rows of each array, the present invention is not limited thereto. Therefore, in the flat panel display device of the present invention, as pads and leads are distributed on both sides of the substrate and the connection part, various types of arrangements are possible.

In the exemplary embodiment of the present invention, the pads are disposed on one side of the substrate, for example, but the pad structure of the present invention is not limited thereto. Therefore, the pads included in the pad unit according to the present invention may be formed on both opposite sides of the substrate. In addition, pads of the lead portion may also be formed on both sides of the film.

In addition, in the above-described embodiment of the present invention, for example, the pad part and the lead part are arranged in two rows, for example, but the pad part structure of the present invention is not limited thereto, and each pad is disposed in two or more rows. And various wiring patterns may be applied accordingly.

As described above, the embodiment of the present invention has been described with reference to a case of a chip on film (COF) type in which a flexible printed circuit (FPC) is applied to the connection part 410, but the present invention is not limited thereto.

In addition, the scope of the present invention is not limited to the position of a drive circuit part or the pattern of the lead wiring of a connection part.

In addition, although one embodiment of the present invention has been described with reference to the flat panel display as an example of an electroluminescent device, the present invention is not limited to the type or driving method of the pixel portion.

The light emitting layer of the pixel unit included in the flat panel display device according to the present invention may include any one of an organic material and an inorganic material.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

As described above, the present invention can provide a flat panel display device that overcomes the conventional process limitations, prevents malfunction of the display, and improves production yield, reliability, and added value of the product.

Claims (11)

Board; A pixel portion formed on the substrate; And A flat panel display device including a pad unit on the substrate, the pad unit including a data pad or scan pads, the data unit being disposed in a plurality of rows, at least one of which is electrically connected to the pixel unit to transmit a driving signal. . The method of claim 1, The pad unit is disposed on one side of the substrate. The method of claim 1, The pad unit is disposed on both sides of the substrate. The method of claim 2 or 3, And a connection part including a lead part on a portion of the data pad and leads connected to the scan pads. The method of claim 4, wherein And the lead portion is positioned on one side of the connection portion. The method of claim 4, wherein And the lead parts are disposed on both sides of the connection part. The method of claim 1, And the pad unit is a column in which pads in adjacent rows match. The method of claim 1, The flat panel display device includes a connection part including a lead part electrically connected to the pad part on a partial region. And the lead part electrically connected to pads of the pad part, the leads being arranged in a plurality of rows, wherein the leads coincide with columns of adjacent rows. The method of claim 7, wherein The pads of the pad portion are electrically connected to the pixel portion through wires. The method of claim 8, The leads of the lead portion are connected through a driving circuit portion and lead wires that control a driving signal applied to the pixel portion, and some of the lead wires are disposed on a first surface of the connection portion, and the rest of the lead portions are arranged on the first surface of the lead portion. A flat panel display device disposed on a second surface opposite to the surface. The method of claim 1, And the pixel portion includes an organic emission layer between two electrodes.

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