JP3575482B2 - Display device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device, and particularly to a signal input terminal provided on one of a flexible printed board (hereinafter abbreviated as FPC) for leading an electrode on a gate side or a data side in an active matrix type liquid crystal display panel. The present invention relates to a liquid crystal display device in which electrode terminals of the other FPC are commonly connected via a liquid crystal display panel.
[0002]
[Prior art]
In an active matrix liquid crystal display device in which thin film transistors are arranged in a matrix for each pixel and each pixel is driven, a TAB (Tape Automated Bonding) method is frequently used for connecting a liquid crystal display panel and a driver. However, a COG (Chipon Glass) method in which an IC chip is directly mounted on a liquid crystal display panel made of glass has been increasing.
[0003]
There are various means for supplying an input signal to the driver. In the case of the COG method, an FPC is often used. However, such a method is performed by thermocompression bonding or pressure contact with an anisotropic conductive film (ACF). Is
[0004]
FIG. 4 is a schematic view of a main part of a COG liquid crystal display panel using an FPC.
[0005]
FIG. 4A shows a case where an FPC in which a gate-side FPC 100 and a source-side FPC 200 are formed in an L-shape is used. A liquid crystal display element (not shown) is formed on a liquid crystal display panel 1 having a configuration in which two glass substrates are bonded to each other. In the case of the active matrix method using a TFT as a driver, two sides of one substrate protrude in an L shape from the other substrate, and the gate driver 10 and the source data driver 20 are respectively mounted thereon. It has become. A gate-side driver signal input electrode 11 and a data-side driver signal input electrode 21 are provided on the peripheral side of the mounting positions of the drivers 10 and 20, respectively. The gate-side driver signal input electrode 11 and the data-side driver signal input electrode 21 are connected to the data-side input terminal 101 of the gate-side FPC 100 and the gate-side input terminal 201 of the data-side FPC 200, respectively, by thermocompression bonding or the like. In general, the number of drive drivers on the gate side is smaller than that on the data side. Therefore, the data side FPC 200 is provided with a signal input terminal 203 connected to a drive device (not shown).
[0006]
FIG. 4B shows a case where the FPC 100 on the gate side and the FPC 200 on the data side use FPCs which are strip-shaped and separated. The configuration of the liquid crystal display panel 1 is the same as that shown in FIG. 4A. The data input terminal 101 and the data FPC 200 of the individual gate FPC 100 are respectively connected to the gate driver signal input electrode 11 and the data driver signal input electrode 21. Are connected to each other by thermocompression bonding or the like. Also in this case, since the signal input terminal 203 is provided on the data-side FPC 200, an auxiliary cable 400 is installed from the gate-side FPC 100 to the data-side FPC 200 and connected to the signal input terminal 203.
[0007]
[Problems to be solved by the invention]
However, when an L-shaped FPC is used, the number of components is one, which is easy to manage. However, it is impossible to perform thermocompression bonding on the gate side and the data side at the same time because of the alignment. Moreover, it is troublesome to align one and then thermocompression-bond and then align the other.
[0008]
When a strip-shaped FPC is used, since the FPC is individually connected to the gate side and the data side, there is no inconvenience in positioning or the like, but it is necessary to connect an auxiliary cable. Therefore, there are disadvantages that the number of members is increased in the number of assembling steps and the manufacturing cost is increased.
[0009]
Therefore, the present invention provides a display device in which the connection position between a driving driver mounted on a display panel and an FPC as a signal cable can be easily adjusted, the number of assembling steps and members can be reduced, and connection between FPCs is possible. It is intended to be.
[0010]
[Means for Solving the Problems]
The above-mentioned problem is solved as described in claim 1, in a display device including a substrate having two intersecting sides, at least one of a flexible printed board is connected to each of the two intersecting sides, A connection wiring disposed between one side and the other side of the two intersecting sides on the substrate, and a connection between the flexible printed circuit boards adjacent to the side where the plurality of flexible printed circuit boards are connected. And a connecting electrode disposed on the display device.
[0011]
That is, when one of at least two sides of the liquid crystal display panel is a gate side and the other is a data side, at least two separate FPCs are provided to input electrodes derived from drivers provided on each side of the liquid crystal display panel. Are provided so as to correspond to the respective input terminals. The connection electrodes provided on the liquid crystal display panel move the input terminals of the FPC from the gate side having a small number of terminal electrodes to the data side having a large number of terminal electrodes. That is, an input signal terminal is provided in the FPC on the data side, and the input of both signals on the gate side and the data side is shared.
[0012]
In this case, the two FPCs can be simultaneously connected only by connecting the input terminals of the FPCs on the gate side and the data side to the input electrodes on the liquid crystal display panel.
[0013]
In addition, when the size of the liquid crystal display panel increases and the number of input electrodes derived from the driver mounted on one side increases, one FPC cannot connect from one end to the other end. It is divided into books. When connecting the divided FPCs, a connecting electrode may be provided in a gap on the liquid crystal display panel adjacent to the FPC, and a connecting terminal corresponding to the connecting electrode may be provided on the FPC for connection.
[0014]
Then, when the FPC is connected to the liquid crystal display panel by thermocompression bonding or the like, the FPCs can be connected together in one step, and the efficiency of the FPC connection step can be increased.
[0015]
In addition, the pitch between the input electrode, the connection electrode, and the connection electrode provided on the liquid crystal display panel is made equal, and the pitch between the input terminal, the connection terminal, and the connection terminal of the FPC corresponding to each electrode is also made equal. You can also.
[0016]
Then, when connecting the input terminal, the connection terminal, and the connection terminal of the FPC to the large number of fine input electrodes, connection electrodes, and connection electrodes provided on the liquid crystal display panel by thermocompression bonding or the like, the pressing applied to each terminal is performed. The pressure becomes uniform, and the slack of the FPC becomes uniform. Therefore, the alignment is easy, and the stability of the connection can be improved.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a schematic plan view for explaining a first embodiment of the present invention, FIG. 2 is an enlarged view of main parts of two FPCs of the first embodiment of the present invention, and FIG. It is a schematic plan view explaining Example 2.
[0018]
In the figure, 1 is a liquid crystal display panel, 10 is a first driver, 11 is a first input electrode, 20 is a second driver, 21 is a second input electrode, 30 is a connection electrode, 40 is a connecting electrode, 100 Is a first FPC, 101 is a first input terminal, 102 is a first connection terminal, 200 is a second FPC, 201 is a second input terminal, 202 is a second connection terminal, and 203 is a signal. An input terminal, 204 is a second connecting terminal, 300 is a third FPC, 301 is a third input terminal, and 304 is a third connecting terminal.
[0019]
[First embodiment]
In FIG. 1A, taking a case of an active matrix type liquid crystal display device as an example, a liquid crystal display panel 1 has a structure in which two glass substrates are sealed with liquid crystal separated by a gap of several μm and bonded together. It has become. Although not shown, a transparent electrode pattern is provided in a matrix on one protruding side of the liquid crystal display panel 1, and a TFT (thin film transistor) is provided for each pixel. Further, a first input electrode 11 and a second input electrode 21 are provided on each of the two peripheral portions that intersect. Further, as shown in an enlarged manner in FIG. 1B, a connection electrode 30 is provided alongside the input electrodes 11 and 21 so as to be continuous from one side to the other side. A plurality of first drivers 10 are provided on the first input electrode 11 on one side, and a plurality of second drivers 20 are provided on the second input electrode 21 on the other side. Has been implemented.
[0020]
In FIG. 2A, a first input terminal 101 corresponding to the first input electrode 11 shown in FIG. 1 and a connection terminal shown in FIG. A first connection terminal 102 corresponding to the electrode 30 is provided. The first connection terminal 102 is connected to the first input terminal 101 via a three-dimensional wiring.
[0021]
In FIG. 2B, a second input terminal 201 corresponding to the second input electrode 21 shown in FIG. 1 and a connection electrode 30 shown in FIG. A second connection terminal 202 is provided. A signal input terminal 203 connected to a driving device (not shown) is provided on a side surface in the width direction of the FPC 200. The signal input terminal 203 has a second input terminal 201 and a second connection terminal. 202 are connected via three-dimensional wiring.
[0022]
In the FPC 100, the first input terminal 101 and the first connection terminal 102 are formed, for example, by thermocompression bonding to the first input electrode 11 and the connection electrode 30 on one side of the corresponding liquid crystal display panel 1. Connect by. Similarly, in the FPC 200, the second input terminal 201 and the second connection terminal 202 are connected to the second input electrode 21 and the connection electrode 30 on the other side of the corresponding liquid crystal display panel 1, for example, by thermocompression bonding. Connect by doing. Through this series of connection steps, the FPC 100 can be connected to the signal input terminal 203 provided on the FPC 200 via the connection electrode 30.
[0023]
[Second embodiment]
In FIG. 3, when the other side of the liquid crystal display panel 1 is long, a plurality of FPCs, for example, in this case, two FPCs 200 and FPCs 300 are connected in series. First, the connecting electrode 40 is provided side by side with the second input electrode 21 so that the FPC 300 of the FPC 200 straddles the region adjacent to the FPC 300 on the liquid crystal display panel 1.
[0024]
On the other hand, the FPC 200 is provided with a second connecting terminal 204 corresponding to the connecting electrode 40 at the end adjacent to the FPC 300, which is arranged next to the second input terminal 201. The second connection terminal 204 is connected to the signal input terminal 203 via a three-dimensional wiring. Further, a third connecting terminal 304 corresponding to the connecting electrode 40 is provided on the FPC 300 at an end portion adjacent to the FPC 200 so as to be aligned with the third input terminal 301. The third connection terminal 304 is connected to the third input terminal 301 via a three-dimensional wiring so that the second input electrode 21 provided on the liquid crystal display panel 1 is connected to the signal input terminal 203. I have.
[0025]
Accordingly, the second connection terminal 202, the second input terminal 201, and the second connection terminal 204 of the FPC 200 are connected to the corresponding second connection electrode 30 and second input electrode 21 of the liquid crystal display panel 1, respectively. The third input terminal 301 and the third connection terminal 304 of the FPC 300 are connected to the second connection electrode 40 and the second input electrode 21 and the connection electrode of the liquid crystal display panel 1, respectively. When it is connected to 40 by thermocompression or the like, the second input electrode 21 of the FPC 300 is connected to the signal input terminal 203. That is, simply by connecting the FPC 200 and the FPC 300 to the liquid crystal display panel 1 by thermocompression bonding or the like, the FPC 300 is connected to the signal input terminal 203 via the FPC 200.
[0026]
[Third embodiment]
In FIG. 1, a first input electrode 11 and a connection electrode 30 provided on the liquid crystal display panel 1, a first input terminal 101 and a first connection terminal provided on an FPC 100 corresponding to the electrodes 11, 30 are provided. Make the pitch with each other equal intervals. Further, a second input electrode 21 and a connection electrode 30 provided on the liquid crystal display panel 1 and a second input terminal 201 and a second connection terminal 202 provided on the FPC 200 corresponding to the electrodes 21 and 30 are provided. Are equally spaced. Further, when a plurality of FPCs are provided side by side, the pitch between the connecting electrodes 40 provided on the liquid crystal display panel 1 and the connecting terminals 204 and 304 provided on the FPC 200 and FPC 300 corresponding to the connecting electrodes 40 is equally spaced. To
[0027]
Then, the input terminal, the connection terminal, and the connection terminal provided on the FPC 100 and the like are attached to the input electrode, the connection electrode, and the connection electrode provided on the liquid crystal display panel 1 with a large number of fine pitches by, for example, thermocompression bonding. At the time of connection, the pressing force applied between the terminals of the abutted electrodes becomes uniform, and the slack of the FPC 100 or the like pressed onto the liquid crystal display panel 1 becomes uniform. Therefore, the alignment becomes easy, and the stability of the connection can be improved.
[0028]
Pairs of the electrodes provided on the liquid crystal display panel and the terminals provided on the FPC corresponding to the electrodes may be separately formed at equal intervals, or may be appropriately spaced between the electrodes provided on the liquid crystal display panel. A dummy electrode may be interposed, and a dummy terminal may be appropriately interposed between terminals provided on the corresponding FPC, so that all the electrodes and the terminals may be equally spaced, and various modifications are possible.
[0029]
In the first, second, and third embodiments, when the liquid crystal display panel 1 according to the present invention is applied to an active matrix type liquid crystal display device using a TFT, the first driver 10 is connected to the gate side of the TFT. The second driver 20 can be made to correspond to the IC for controlling the data side, that is, the source of the TFT.
[0030]
Then, the first driver 10 comprises a first input electrode 11 on the liquid crystal display panel 1, a first input terminal 101 of the FPC 100, a first connection terminal 102, a connection electrode 30, and a second connection electrode. Terminal 202 is connected to signal input terminal 203. The second driver 20 is an IC for controlling the data side of the TFT, that is, the source, and is connected to the second input electrode 21 on the liquid crystal display panel 1 → the second input terminal 201 of the FPC 200 → the signal input terminal 203. Be connected. Further, when the FPC 300 is connected to the FPC 200, the second input electrode 21 on the liquid crystal display panel 1 → the third input terminal 301 of the FPC 300 → the third connection terminal 304 → the connection electrode 40 → the second connection terminal 204 → Connect to the signal input terminal 203.
[0031]
【The invention's effect】
According to the present invention, the connection position between the driving driver mounted on the liquid crystal display panel and the FPC serving as the signal cable can be easily adjusted, the number of assembly steps and members can be reduced, and the FPCs can be connected to each other. As a result, the present invention can greatly reduce the number of assembling steps of the liquid crystal display panel, and greatly contributes to lowering the price of the liquid crystal display device.
[Brief description of the drawings]
FIG. 1 is a schematic plan view illustrating a first embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of two FPCs according to the first embodiment of the present invention.
FIG. 3 is a schematic plan view illustrating a second embodiment of the present invention.
FIG. 4 is a schematic diagram of a main part of a liquid crystal display panel of a COG using an FPC.
[Explanation of symbols]
1 LCD panel
10 First driver 11 First input electrode
20 Second driver 21 Second input electrode
30 Connection electrode
40 connecting electrode
100 first FPC 101 first input terminal 102 first connection terminal
200 second FPC 201 second input terminal 202 second connection terminal
203 Signal input terminal 204 Second connection terminal
300 Third FPC 301 Third input terminal 304 Third connection terminal

Claims (2)

In a display device including a substrate having two intersecting sides,
At least one of the flexible printed circuit boards is connected to each of the two intersecting sides,
On the substrate,
Connection wiring disposed between one side and the other side of the two intersecting sides ,
A display device, comprising: a connection electrode disposed between adjacent flexible printed boards on a side to which the plurality of flexible printed boards are connected . A signal input from the one side is supplied to the other side via the connection wiring ,
The display device according to claim 1, wherein a signal is supplied to the adjacent flexible printed circuit board via the connection electrode .

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