JPH0511638B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention includes a first substrate provided with a plurality of display electrodes, a second substrate provided with a plurality of scan electrodes, and a substrate sealed in the intersecting opposing portions of the two electrodes. The present invention relates to a dot matrix liquid crystal display device having a liquid crystal or the like.

<Prior Art and Its Disadvantages> A conventional dot matrix liquid crystal display device has a display electrode drive circuit and a scanning electrode drive circuit on a printed circuit board, and further has a circuit board for connecting to the lead electrodes of the liquid crystal display on this printed circuit board. Electrodes are provided, and the printed circuit board and the liquid crystal display are connected by anisotropic conductive rubber or the like. Such conventional dot matrix liquid crystal display devices require very high dimensional accuracy and positioning accuracy because the electrodes of the circuit board and the electrodes of the liquid crystal display are connected. For this reason, the pitch between the electrodes cannot be made very small, which has been a bottleneck in forming a high-definition, large-area liquid crystal display.

As another method, there is a structure in which a driving circuit is directly disposed on the display electrode substrate, but other problems arise when forming a multi-dot, large-area liquid crystal display. FIGS. 3 and 4 show examples thereof. In the figure, 1 is a first substrate provided with display electrodes 5, 2 is a second substrate provided with scanning electrodes 6, and display electrode drive circuits 31, 3 are provided on the first substrate.
2, 33, 34 and scan electrode drive circuits 41, 4
2 is provided. Therefore, the output electrodes of the scan electrode drive circuits 41 and 42 need to be connected to the scan electrode 6 provided on the second substrate. 1
Reference numeral 1 indicates a transfer connection portion for this purpose, but as shown in the figure, it is necessary to provide a large number of connection portions.
Transfer requires a certain minimum amount of space, which limits densification. Furthermore, the area occupied by the scan electrode drive circuit is large, and the ratio of the effective display area to the entire substrate is small. Further, although a carbon-based conductive agent, silver paint, etc. are used for the transition portion, this causes problems such as a decrease in process yield, an increase in cost, and a problem in ensuring reliability.

<Objective of the Invention> The present invention has been made to solve the above-mentioned conventional problems, and its object is to easily obtain a high-definition, large-area dot matrix liquid crystal display device.

<Configuration and Effects of the Invention> The present invention provides a display electrode drive circuit and a first input or output circuit for the display electrode drive circuit in an area outside the display area of the display electrode substrate and along the side of the substrate.
A scanning electrode driving circuit and a second signal line for inputting or outputting the scanning electrode driving circuit are arranged outside the display area of the scanning electrode substrate and along the side of the substrate. , the display electrode drive circuit and the first signal line are directly connected on the first substrate, and the scan electrode drive circuit and the second signal line are directly connected on the second substrate. , the first signal line and the second signal line are transfer-connected only at opposing portions where the sides of both the substrates intersect with each other.

According to the above configuration, the region where the signal line is transferred and connected is only the opposing portion where the sides of the two substrates intersect, and the transfer connection is performed for input or output signal lines whose number is considerably smaller than the number of electrodes. Because of this, the number of transfer connections is extremely small. In addition, since the area of the transition connection does not affect the electrode wiring, the area of the substrate constituting the liquid crystal display can be used effectively, and a high-definition, large-area dot matrix liquid crystal display can be realized. Can be configured.

<Embodiment> FIG. 1 shows a dot matrix liquid crystal display device according to the present invention (the figure shows only a part (left end) of the display body). 3 is a display electrode drive circuit provided outside the display area of the first substrate provided with display electrodes;
2, 33, and 34 are shown. 4 is a scanning electrode drive circuit provided outside the display area of the second substrate provided with scanning electrodes;
2 is shown. Display electrode drive circuits 31 and 32 provided in the upper part drive the display electrodes in the upper half of the display section, and display electrode drive circuits 33 and 32 provided in the lower part drive the display electrodes in the upper half of the display section.
34 drives display electrodes in the lower half of the display section. Further, the scan electrode drive circuit 41 drives the scan electrodes corresponding to the upper half of the display area, and the scan electrode drive circuit 42 drives the scan electrodes corresponding to the upper half of the display area.
drives the scanning electrodes in the lower half of the display section. Each of these drive circuits is an LSI chip itself, and the display electrode drive circuit is directly bonded to the first substrate, and the scanning electrode drive circuit is bonded directly to the second substrate. It is bonded. A first signal line 7 is provided along the side of the first substrate, and is a common input or output signal line for each display electrode drive circuit. Further, reference numeral 8 denotes a second signal line for common input or output to the scanning electrode drive circuit provided along the side of the second substrate. Reference numeral 9 denotes a connection portion between the first signal line and the second signal line, which is made by transfer connection. Connection between a device using this display device and this display device is made via an external connection terminal 10.

As is clear from the figure, the transfer connection part is the substrate 1,
Formed only in the area where the two sides intersect,
Further, the number of these lines is only input or output signal lines for each drive circuit, and the number thereof is very small. In addition, the distance between the scan electrode drive circuit and the scan electrode is short, and the transfer connection portion is formed at the intersection on the side of the substrate that does not affect the wiring of the scan electrode and display electrode. Area can be used effectively. Further, since the display electrode substrate is also equipped with only the display electrode drive circuit, its area can be used effectively.

In addition, in the figure, for illustrative purposes, a display electrode, a display electrode drive circuit, a first signal line provided on a first substrate, and a scan electrode, a scan electrode drive circuit, and a second signal line provided on a second substrate are shown. Although both are drawn as solid lines, either the first substrate or the second substrate may be on the front side.

FIG. 2 is a perspective view corresponding to FIG. 1. As is clear from the figure, the display body itself is approximately within the thickness of the first substrate 1, second substrate 2, etc.
The overall structure can be very thin. In addition, in the figure, display electrode drive circuits 31, 32,
33, the wire bond wire is omitted.

In the above embodiment, the LSI chips, which are each drive circuit, are mounted on the board by wire bonding, but other methods such as flip-chip bonding or film carrier type LSIs may also be mounted by heat sealing or other methods. It is possible.

[Brief explanation of the drawing]

FIG. 1 shows a dot matrix liquid crystal display device according to the present invention. Figure 2 is a perspective view of the
The figure is a diagram for explaining a dot matrix liquid crystal display device according to a conventional method, and FIG. 4 is a perspective view thereof. 1...First substrate, 2...Second substrate, 3...
Display electrode drive circuit, 4...Scanning electrode drive circuit, 5
...Display electrode, 6...Scanning electrode, 7...First signal line, 8...Second signal line, 9...Transition connection part,
10...External connection terminal.

Claims (1)

[Claims] 1. In a dot matrix liquid crystal display device having a first substrate provided with a plurality of display electrodes, a second substrate provided with a plurality of scanning electrodes, and a liquid crystal sealed in an intersecting opposing portion of both electrodes, the A display electrode drive circuit and a first signal line for input or output of the display electrode drive circuit are disposed outside the display area on the display electrode surface side of the first substrate and along the side part of the substrate, and a first signal line for inputting or outputting the display electrode drive circuit is provided. A scan electrode drive circuit and a second signal line for input or output of the scan electrode drive circuit are disposed outside the display area on the scan electrode surface side of the second substrate and along the side of the substrate, and the display The electrode driving circuit and the first signal line are directly connected on the first substrate, the scanning electrode driving circuit and the second signal line are directly connected on the second substrate, and the scanning electrode driving circuit and the second signal line are directly connected on the second substrate. 1. A dot matrix liquid crystal display device, characterized in that a first signal line and a second signal line are transferred and connected only at an opposing portion where a side portion of the first substrate and a side portion of the second substrate intersect.