JPH06242462A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To reduce cost by making the shape of a flexible printed circuit board on an input side connected to a liquid crystal display device small in the liquid crystal display device obtained by mounting plural LSIs on an LCD substrate. CONSTITUTION:This liquid crystal display device 10 is constituted by respectively mounting the LSIs 21, 22 and 23 outputting a driving signal to a liquid crystal screen 13 on plural side parts of the substrate 12 of the LCD 11 having the liquid crystal screen 13 and connecting the flexible printed circuit board 30 inputting the signals in the respective LSIs 21, 22 and 23; and an electrode pattern for connection with the circuit board 30 is provided at one spot on the side part of the substrate 12 of the LCD 11, and a wiring pattern connecting the electrode pattern for connection and the respective input terminals of the LSIs 21, 22 and 23 is provided on the substrate 12 of the LCD 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having improved connection between electrodes on an LCD substrate and a flexible printed circuit board.

[0002]

2. Description of the Related Art In recent years, a liquid crystal display device has been adopted as a display device in various kinds of equipment, and the liquid crystal is suitable for carrying because of its small size, light weight and low power consumption. Figure 4 shows a conventional LCD
(Liquid crystal display device) 41 glass substrates 42 of three L
1 shows an example of a liquid crystal display device 40 having a mounting structure such as COG (chip on glass) for directly mounting SIs (Large Scale Integrated Circuits) 51, 52, 53. The three LSs are shown.
The I51, 52, 53 and the flexible printed circuit board 60 are arranged so as to form a pair.

That is, on the glass substrate 42 having the liquid crystal screen 43 of the LCD 41, the output side ITO patterns 44, 45 and 46 which are transparent conductive films as shown in FIG. 5 and the input side ITO patterns corresponding to the respective ITO patterns 44, 45 and 46. 47, 48, 4
9 is formed. Output side ITO that makes up these three sets
Patterns 44, 45, 46 and ITO pattern 4 on the input side
LSIs 51 and 5 connecting between 7, 48 and 49, respectively
2, 53 are mounted, and these three LSIs 51, 5 are mounted.
2, 53 have an input side terminal 56 and an output side terminal 57 as shown in FIG. As shown in FIG. 1, the flexible printed circuit board 60 connected to the ITO patterns 47, 48, 49 on the input side has the connecting piece 6 in the perpendicular direction.
1, 62, and two groups of through holes 63, 63, 63, ...
63, 63, 63, ... This flexible printed circuit board 60 has a wiring pattern 65 on the back surface,
The narrow connecting piece 61 has a connecting terminal 66, and the wide connecting piece 62 has two connecting terminals 67, 68.
have. The connection terminals 67 and 68 are formed by wiring patterns 69 and through holes 63, 63, 63, ..., 63, 63, 6 on the front surface side of the flexible printed circuit board 60.
3, ... are connected. The connection terminals 66, 67, 68 of the flexible printed circuit board 60 are connected to the LCD.
ITO patterns 47, 48 on the input side of the glass substrate 42,
LCD by connecting each to 49 by thermocompression bonding
41 is connected to a circuit board of a device body such as a liquid crystal television (not shown).

[0004]

As described above, the prior art is as follows.
Connection piece 6 perpendicular to the flexible printed circuit board 60
Therefore, the flexible printed circuit board 60 has a large shape. Also, two LSI5
Since it is necessary to connect the common signals of 1, 52, a flexible printed circuit board 60 of double-sided through-hole type on the side of the wide connecting piece 62 is required, which has a drawback of high cost.

Therefore, an object of the present invention is to provide a liquid crystal display device in which the size of a flexible printed circuit board connected to an LCD circuit board on which a plurality of such LSIs are mounted can be reduced to reduce the cost.

[0006]

In order to solve the above problems, according to the present invention, an LSI for outputting a drive signal to a liquid crystal screen is mounted on each of a plurality of side portions of an LCD substrate having a liquid crystal screen. In a liquid crystal display device configured by connecting a flexible printed circuit board for inputting a signal to each of the LSIs, an electrode pattern for connection with the flexible printed circuit board is provided at one side of the LCD circuit board, and the LCD The board is provided with a wiring pattern for connecting the connecting electrode pattern and each input terminal of the LSI. For example, in the LSI, the drive signal terminal on the output side is input to one side portion of the chip, the common signal terminal on the input side is input to the other one side portion of the chip, and the other one side portion of the chip is input. Each side has a non-common signal terminal.

[0007]

The LCD substrate is mounted on a plurality of sides of the LCD substrate.
Since the wiring pattern to be connected to each input terminal of SI is provided with the connecting electrode pattern gathered at one place on the side portion, the connection with the flexible printed board can be made at one place. It should be noted that such an LCD substrate has one chip
By implementing an LSI having a drive signal terminal on the output side on the side portion, a common signal terminal on the input side on the other one side portion, and a non-common signal terminal on the input side on the other one side portion Can handle.

[0008]

Embodiments of the liquid crystal display device according to the present invention will be described below with reference to FIGS. First, FIG. 1 shows an LCD 1 as an example of a liquid crystal display device 10 to which the present invention is applied.
1 shows the mounting configuration of the LSIs 21, 22, 23 and the flexible printed circuit board 30 on the LCD 1. The glass substrate 12 of the LCD 11 has two left and right LSIs 21, 22 mounted on the lower side of the liquid crystal screen 13. One LSI 23 is mounted on the right side portion of the liquid crystal screen 13.

That is, the LCD 11 has the glass substrate 12
In addition to having the liquid crystal screen 13 inside, indium oxide (In ₂ O 3) which is one of the transparent conductive films on the output side connected to each pixel of the liquid crystal screen 13 is provided on the lower side of the surface of the glass substrate 12.
₃ ) Left and right ITO patterns 14, 1 made of ITO film
5 is formed. Further, on the right side portion of the surface of the glass substrate 12, left and right ITO patterns 16 are similarly formed by the output side ITO film connected to each pixel of the liquid crystal screen 13. Further, as shown in FIG. 2, on the surface of the glass substrate 12 of the LCD 11, ITO patterns 17, 18 and 19 are formed by the same ITO film on the input side corresponding to the ITO patterns 14, 15 and 16 on the output side. At the same time, the ITO patterns 17, 18 and 19 on the input side are collectively formed into a connecting electrode pattern 20 which is gathered at one location on the right side portion.

On the lower side of the glass substrate 12 of the LCD 11, two LSIs 21 and 22 for connecting the ITO patterns 14 and 15 on the output side and the ITO patterns 17 and 18 on the input side are respectively connected. As well as implementing,
An LSI 23 for connecting the ITO pattern 16 on the output side and the ITO pattern 19 on the input side is mounted on the right side portion of the glass substrate 12. Here, the LSI 21,
Reference numerals 22 and 23 are elongated rectangular chips, and as shown in FIG. 3, one long side portion has a large number of drive signal terminals 26 which are output side terminals, and one short side portion has an input. In addition to having a large number of common signal terminals 27 which are side terminals, a plurality of (four in the figure) non-common signal terminals 28 which are also input side terminals are provided at one side of the other long side portion.

The above LSIs 21, 22, 23 are provided with ITO patterns 14, 15, 16, 1 on the glass substrate 12 of the LCD 11 by bumping solder balls on their respective terminals.
COG mounting is performed by connecting to each terminal of 7, 18, and 19.
Then, the ITO on the input side of the glass substrate 12 of the LCD 11
In the connection electrode pattern 20 on the right side portion in which the patterns 17, 18 and 19 are collectively arranged, the connection electrode of the wiring pattern 31 provided on the back surface of the flexible printed board 30 having a uniform width. The patterns 32 are connected by thermocompression bonding. The liquid crystal display device 10 having such a configuration is
For example, it is attached to a small electronic device such as a liquid crystal television or an electronic notebook.

As shown in FIG. 1, in the LCD 11 to which a flexible printed board 30 is connected, a signal is input to a wiring pattern 31 from a circuit board of a device body such as a liquid crystal television (not shown), and a connection electrode pattern 32 is formed. , 20 to I
Each LS is passed through the TO patterns 17, 18 and 19 respectively.
Signals enter I21, 22, and 23, respectively. Then, in each LSI 21, 22, 23, after the image signal is processed, a signal is sent from each ITO pattern 14, 15, 16 to the liquid crystal screen, each pixel is driven, and an image is displayed.

As described above, the glass substrate 12 of the LCD 11
By efficiently performing the wiring pattern on the input side to each of the above LSIs 21, 22, and 23, that is, the ITO patterns 17, 18, and 19, it is not necessary to arrange a flexible printed circuit board around the LCD 11 unlike the conventional case. The non-image area can be reduced, and the cost can be reduced as compared with the conventional case. In addition, each LSI on the glass substrate 12 of the LCD 11
ITO patterns 17, 1 on the input side to 21, 22, 23
Since 8 and 19 can be configured on one plane and cross wiring of the two front and back layers can be eliminated, a flexible printed circuit board 30 of uniform width can be used without using a conventional double-sided through-hole type flexible printed circuit board. In addition to providing the wiring pattern 31 on only one side, it becomes more advantageous in terms of cost reduction.

Although the liquid crystal television and the electronic notebook are used in the above embodiments, the present invention is not limited to this, and a liquid crystal display device provided in another electronic device may be used. Further, regarding the structure of the wiring pattern formed by the anisotropic conductive film provided on the LCD substrate and its forming material,
In addition to TO, Al or Ag paste may be used, and further L
The SI configuration and the like are arbitrary, and it is needless to say that the specific detailed structure and the like can be appropriately changed.

[0015]

As described above, according to the liquid crystal display device of the present invention, the flexible printed circuit board on the input side can be connected to the LCD circuit board on which the LSIs are mounted on a plurality of side portions at one place. Since it is good, the flexible printed circuit board can be downsized, and the area around the LCD substrate can also be downsized. Further, the flexible printed circuit board only needs to be provided with a wiring pattern on one surface thereof, and thus cost reduction can be achieved. . For example, a drive signal terminal on the output side is provided on one side of the chip according to claim 2, a common signal terminal on the input side is provided on the other one side, and a non-common input side is provided on the other side. By using an LSI having each signal terminal, it is possible to cope with the mounting on the LCD substrate as described above.

[Brief description of drawings]

FIG. 1 is a plan view showing a mounting configuration of an LSI and a flexible printed board on an LCD as an example of a liquid crystal display device to which the present invention is applied.

FIG. 2 is a plan view showing a wiring pattern of an LCD according to an embodiment of the present invention.

FIG. 3 is also a perspective plan view showing a terminal configuration of an LSI mounted on an LCD according to the embodiment of the invention.

FIG. 4 is a plan view showing an example of a mounting configuration of an LSI and a flexible printed board on a conventional LCD.

FIG. 5 is a plan view showing a wiring pattern of a conventional LCD.

FIG. 6 is a perspective plan view showing a terminal configuration of an LSI mounted on a conventional LCD.

[Explanation of symbols]

10 liquid crystal display device 11 LCD 12 glass substrate 13 liquid crystal screen 14, 15, 16, 17, 18, 19 wiring pattern (ITO pattern) 20 connection electrode pattern 21, 22, 23 LSI 26 output side drive signal terminal 27 input side Common signal terminal 28 Non-common signal terminal on input side 30 Flexible printed circuit board 31 Wiring pattern 32 Electrode pattern for connection

Claims (2)

[Claims] 1. An integrated circuit for outputting a drive signal to the liquid crystal screen is mounted on each of a plurality of sides of a substrate having a liquid crystal screen, and a flexible printed circuit board for inputting a signal to each of the integrated circuits is connected. In the liquid crystal display device configured as described above, an electrode pattern for connection with the flexible printed circuit board is provided at one position on a side portion of the substrate having the liquid crystal screen, and the connection electrode pattern is provided on the substrate having the liquid crystal screen. And a wiring pattern for connecting the input terminals of the integrated circuit with each other. 2. The integrated circuit comprises an output side drive signal terminal on one side of the chip, an input common signal terminal on the other side of the chip, and a further one side of the chip. 2. The liquid crystal display device according to claim 1, wherein each of the side portions has an input-side non-common signal terminal.