JPS58122586A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Kinoe 1811 relates to the structure of a large-capacity liquid crystal display device that displays a large number of characters and pictorial information.

In recent years, along with the development of LSI technology, application books on low-voltage drive, low-power consumption liquid crystal display devices have become increasingly popular. As is well known, it is used in calculators as a display in portable equipment due to its small size, thinness, and low power consumption. Attempts are being made to apply this to water-rich terminals and LCD televisions.

Conventionally, as a method for connecting electrodes between the display panel, drive circuit, and substrate of this type of IJx liquid crystal display device (IJX), as shown in FIG. Conductivity was achieved by connecting the electrodes of the substrate 1 by thermocompression bonding, or by sandwiching and pressing the zebra rubber 5 shown in FIG. 1(c)K between the display panel and the insulating substrate.

However, in such a structure, as shown in Figure 1 (bl), in the case of heat seal 3, the conductive resin 4 is screen printed, so the minimum pitch is 5 dragons, and in the case of zebra rubber 5, conductive rubber 6 is used. , the minimum pitch is 04 mm, and it can be used as a terminal for office equipment due to the Fi-display density, but even higher capacity (20,000 to 50,000 dots) and higher resolution (pitch 01 to 02 and 8 display panel electrodes) are required. 500
It is unsuitable as a connection method for large-capacity liquid crystal displays such as liquid crystal televisions, which require the following. Therefore, as a connection method for high-density pattern panels, a method using wire bonding, as shown in FIG. 2, is being implemented at the development and trial production stage. A display panel 2 and a plurality of ICs 7 are attached to the ceramic multilayer wiring board 10 using wires 8.9.
The wire-pond method, which is a simple connection technique between electrodes, is used for electrical connection between the electrodes.

According to the above-mentioned method, as a connection method for a high-density, large-capacity S display panel, (1) Suppose that the heat sealing and zebra rubber methods have been improved and can be applied to high density. Connection is not easy, and the display device must be made smaller.

(2) The wire bonding method allows the drive IO to be mounted at the same time and is technically simple, but since the dot matrix drive circuit is glue-like, wire bonding requires a ceramic multilayer! A J'-line board is required and is expensive. or,
The number of wire bonds on the panel side is 1000 in total, 11 for IO.
The drawbacks of the cape include a large number of man-hours during mass production, a decrease in yield, and concerns about reliability.

The present invention has been made in order to eliminate the defect of the upper P, and to provide a structure for a high-density variable-capacity liquid crystal display device that is small, has a high overall yield, is inexpensive, and is highly reliable. This is the purpose of the book.

The present invention will be explained in detail below with reference to embodiments shown in the drawings. Third
In FIG. 4, the substrate is made of a resin insulating substrate made of glass epoxy or the like, and has a groove 19 larger than the liquid crystal display 18 for positioning and fixing the liquid crystal display. 12Fi■～
As shown by O, the integrated circuit for driving a multi-stage nine liquid crystal display device (69) is bonded to the first metal #13 formed by etching in advance on the insulating film 20 by the method of thermocompression bonding. and configure the drive unit. The drive unit is manufactured at the manufacturing factory in a separate process for setting the liquid crystal display body 18 and the resin insulating substrate 11, and after checking the electrical characteristics, only non-defective units are assembled into the liquid crystal display device in the next process. The minimum pitch of 17 electrodes provided at the edge of the liquid crystal display 18 is 01 μm.

The electrode width is 60 to 70 μm, and the number of electrodes is approximately 200 per side of the liquid crystal display. For simultaneous bonding, the pitch width of the second metal conductor lv#16, which is provided extending from the metal groove wiring 13 in the drive connit and formed by etching in advance, is the same as the IHI of the electrode of the liquid crystal display 18, and the metal The number of conductive wires 16 is determined by the optimum combination of bonding metals such as gold-tin eutectic bonding or gold-all thermocompression bonding P1. (Usually 40-60 pieces)K
do.

In addition, for the nine drive signal input common cables 15 provided around the resin insulating substrate 11, there is a third cable provided in a short length from the metal groove wiring 13 in the drive unit and formed by etching in advance. The pitch width of the four metal interconnects 1114 is made the same.

Next, to explain how to assemble the liquid crystal drive unit, align the four metal wirings 516 and 14 of the drive unit with the electrodes 17 of the liquid crystal display and the electrodes 15 of the resin insulated substrate 11, respectively, and simultaneously bond them by thermocompression bonding or the like. 11 depending on the method. In addition, the one shown in Figure 5 is another embodiment, and in order to prevent the wiring from forming a large number of metal grooves, the tips of all four metal wirings in the drive unit are made into a slender shape with a width of about 0.5 sm. The insulating film is connected with 20'.

Since the insulating film 20' gets in the way when joining the electrode 17 at the end of the liquid crystal display 18 and the electrode 16 of the drive unit, the metal conductor 41114, 16 side is connected to the liquid crystal display 18.
And it is necessary to face the resin insulating substrate 11 side. In addition, it is necessary to apply an insulating paste 21 on the metal groove wiring 14 to prevent contact and short circuit with the metal groove wiring 15 on the resin insulating substrate. 2 in Figure 5
2 is a cushioning material for the resin insulating substrate 11 of the liquid crystal display 18. In the wire bonding method shown in FIG. It is also possible to use a method in which all the metal grooves 16 can be joined together by heat. In addition, 23 in FIG. 5 is a through window of the same size as the screen of the liquid crystal display provided on the resin insulated substrate 11, and the display screen can be viewed from either side of the resin insulated substrate depending on design needs. It's a matter of fact.

In the present invention, as shown in F above, the drive circuit for driving the liquid crystal is made into a unit using an insulating film substrate in advance, and only good products are added to the liquid crystal display body and the resin insulating substrate by bonding mainly using heat. Therefore, 1) Since only non-defective drive units are incorporated, the overall yield as a display device is high and the cost is low.

2) Since the drive unit can be compressed like a crossover wiring, an expensive multilayer wiring board such as a ceramic board is not required for mounting the liquid crystal display.

3) Heat sealing is considerably smaller and denser than zebra rubber, and has the remarkable effect of realizing more reliable bonding than wire bonding.

[Brief explanation of drawings]

FIG. 1(a) and FIG. 2 are cross-sectional views showing conventional embodiments;
Figure 1 (bl, (c) is a perspective view of the connector, Figure S
I! FIG. 4 is a plan view and a sectional view of a liquid crystal display device according to an embodiment of the present invention. FIG. 5 is a sectional view of another embodiment according to the invention. 1.11...Liquid crystal display mounting board 2.18...
...Liquid crystal display 7.12...Integrated circuit 20.20'...Insulating film and above Applicant Seiko Keiyo Kogyo Co., Ltd. Agent Patent attorney Mogami Mogami Figure 1 ( 4) Figure 1 (b) Figure 1 (C) Figure 2 [] Figure 4/'/ Figure 5

Claims (3)

[Claims] (1) *Crystal display body and metal grooves Nr'# are provided. An insulating substrate with a larger external shape than the IV liquid crystal display body, and a metal groove wiring [w
A plurality of drive units are connected to each other by a distance of Km, an electrical wire provided with an end trap of the liquid crystal display, a second metal conductive wire provided on the drive unit, and the insulating substrate; 1. A liquid crystal display technology, characterized in that the electrode is configured by VK connection of the electrode and the third gold conductive wiring provided in the drive unit in alignment with each other. (2) The second metal groove wiring provided in the drive unit protrudes from the insulating film, and each tip is completely connected by a narrow insulating film. LCD display device. (3) The P* substrate has a through window that is larger than the external shape of the liquid crystal display and has the same degree of consistency as the screen of the liquid crystal display, and there is a buffer between the liquid crystal display and the substrate. 2. The liquid crystal display device according to claim 1, further comprising a material.