JPH0228617Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a liquid crystal display device in which a liquid crystal display element (hereinafter referred to as LCD) and its driving section are connected by a flexible connector.

(b) Prior art Conventionally, in a liquid crystal display device consisting of an LCD and a drive unit that have terminals on two or more sides for connection to the drive unit, a crimp type rubber is used to connect the LCD and the drive unit. connectors have been used. Recently, LCDs that display a large amount of information, such as graphic display LCDs, have a large number of electrode terminals.
The electrode pattern pitch of the terminal part is narrow (for example, 640
0.35 mm pitch in a graphic display of ×200 dots), but as shown in Figure 1, electrode terminals are now provided not only on three sides but also on four sides [In Figure 1, 1 is the display area, 2, 2 ', 2'', 2 are terminal parts, 3, 3', 3'', 3 are electrode terminals]. Under such circumstances, crimp-type rubber connectors have low workability because it is difficult to align the electrodes of the LCD terminal section and the electrodes of the drive section, and leakage between the electrodes often occurs due to moisture adhesion. Therefore, recently, the above connection has been made using a flexible connector made of a flexible substrate. Connections using this connector have a greater degree of freedom in positioning than the rubber connector crimp method, and connections can be made using a combination of thermocompression bonding and adhesives, resulting in highly reliable connections, especially thermocompression bonding. In the case of the method, by coating the vicinity of the crimped portion with a moisture-proofing agent, moisture adhesion can be prevented even in high humidity, and leakage between the electrodes can be avoided.

When connecting the LCD and its drive unit with flexible connectors on three sides, first connect the three sides of the LCD with three
One terminal of each of the three connectors is crimped, and then the other terminals of these connectors are successively crimped to the terminal portions on three sides of the drive section for connection. Specifically, a method as shown in FIG. 2 can be considered.
That is, the liquid crystal display element 11 and its driving part 14 are connected at the first side by the thermocompression bonding parts 13 and 17 by the flexible connector 12, and at the third side by the thermocompression bonding parts 13' and 17 by the flexible connector 12'. ′
(However, the connection on the second side is not shown). Further, 15 is a signal generation circuit board of the driving section 14, and 16 and 16' are LSIs. However, in this case, when the terminals of the flexible connector on the third side are finally thermocompression bonded to the terminals of the drive unit 14, the work efficiency is not good because the other two sides are fixed on the same surface. As a countermeasure to this problem, as shown in FIG.
4 is divided into two parts, and the first and third sides of the LCD 21 are connected to the thermocompression bonding parts 23 by flexible connectors 22, 22' to the signal generation circuit boards 25, 25' in which the driving part 24 is divided into two parts. ,23',2
5 and 25' (the connection on the second side is not shown). Next, the two divided substrates 25, 25' are connected by wire lines 27 or the like. In this case, since the drive unit 24 is divided into two parts, the third side can be connected with good workability, but the number of parts and steps increases, which adversely affects reliability.

(c) Purpose of the invention The purpose of this invention was to improve the above problems, and to provide a liquid crystal display in which an LCD and its drive unit are connected, with a simple configuration and good workability. We are here to provide you with the equipment.

(d) Structure of the device This device is composed of a liquid crystal display element in which a liquid crystal composition is sandwiched between two substrates, and its driving part, terminal parts are provided on two or more sides of the liquid crystal display element, and the A liquid crystal display device in which a terminal part and a terminal part of a driving part are connected by a flexible connector, in which at least one terminal part of the terminal parts provided on two or more sides of the liquid crystal display element is connected to a terminal part of the driving part. The present invention provides a liquid crystal display device characterized in that the terminal portion on the side not facing the display element is connected by a flexible connector. In addition, as one aspect of this invention, a groove is provided in the board of the drive unit through which a flexible connector can pass.
By means of the flexible connector passed through this groove, at least one terminal section of the terminal sections provided on two or more sides of the liquid crystal display element is connected to the terminal section on the side of the drive section that does not face the liquid crystal display element. A liquid crystal display device is provided.

(e) Example This invention will be described in the following cross-sectional diagram of the example (4th to 7th).
(However, in both cases, only the connection between the first side and the third side is shown, and the connection on the second side is not shown.)

In FIG. 4, the thermocompression bonding parts 33 and 33' of the terminal parts on the first side and the third side of the LCD 31 are connected to the surface of the board 35 of the driving part 34 that does not face the LCD 31 by the flexible connectors 32 and 32', respectively. They are connected by thermocompression bonding parts 37, 37'. In FIG. 5, 43 of the thermocompression bonded parts 43 and 43' of the terminal parts on the first side and the third side of the LCD 41 are connected to the driving part 44.
43' is connected to the thermocompression bonding part 47 on the surface facing the LCD 41 of the board 45.
It is connected to the thermocompression bonding part 47' on the surface not facing the.

In FIG. 6, the thermocompression bonding section 53 of the terminal section on the first side of the LCD 51 is connected to the thermocompression bonding section 57 on the surface of the driving section 55 facing the LCD 51, but the thermocompression bonding section 53 of the terminal section on the third side The portion 53' is a thermocompression bonded portion 5 on the surface of the substrate 55 of the driving section 54 that does not face the LCD 51, by means of a flexible connector 52' that passes through a groove 58 provided on the substrate 55 of the driving section 54.
7'.

In FIG. 7, the thermocompression bonded parts 63 and 63' of the terminal parts on the first and third sides of the LCD 61 are connected to the flexible connector 62 and the flexible connector 62, which are passed through the grooves 68 and 68' provided in the substrate 65 of the drive part 64, respectively. 62' is connected to thermocompression bonding parts 67, 67' on the surface of the substrate 65 of the drive unit 64 that does not face the LCD 61.

In each of the above embodiments, the terminals on at least one side of the LCD are connected by a flexible connector on the side of the drive unit that does not face the LCD, so the connection on the third side also has good workability. It can be carried out.

(f) Effects of the invention The liquid crystal display device of this invention has a simple structure and can be manufactured with good workability. Also, by adjusting the length of the flexible connector.
Since sufficient space can be provided between the LCD and the drive unit board, it is also possible to provide a backlighting device such as an EL lighting board, and the visibility of the LCD at night can also be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of an LCD provided with electrode terminals on four sides, and FIGS. 2 and 3 are cross-sectional views of a conventional liquid crystal display device in which an LCD and a driving section are connected by a flexible connector. 4 to 7 are cross-sectional views of the structure of an embodiment of the liquid crystal display device of this invention. 1... Display section, 2, 2', 2'', 2... Terminal section, 3, 3', 3'', 3... Electrode terminal, 11, 2
1, 31, 41, 51, 61...LCD, 12,
12', 22, 22', 32, 32', 42, 4
2', 52, 52', 62, 92'...Flexible connector, 13, 13', 23, 23', 33,
33', 43, 43', 53, 53', 63, 6
3'...Thermocompression bonding part in LCD, 14, 24, 3
4, 44, 54, 64...driver, 15, 25,
35, 45, 55, 65... Drive unit board, 1
6, 16', 26, 26', 36, 36', 46,
46', 56, 56', 66, 66'...LSI, 1
7, 17', 27, 27', 37, 37', 47,
47', 57, 57', 67, 67'...Thermocompression bonding portion of the drive unit board, 58, 68, 68'...Groove through which the flexible connector passes.

Claims (1)

[Claims for Utility Model Registration] 1. A liquid crystal display element consisting of a liquid crystal composition sandwiched between two substrates and its driving part, with terminal parts provided on two or more sides of the liquid crystal display element, A liquid crystal display device in which a terminal part and a terminal part of a driving part are connected by a flexible connector, in which at least one terminal part of the terminal parts provided on two or more sides of the liquid crystal display element is connected to a terminal part of the driving part. 1. A liquid crystal display device, characterized in that the terminal portion on the side not facing a display element is connected by a flexible connector. 2. A groove is provided in the substrate of the drive unit through which the flexible connector can pass, and the flexible connector that passes through the groove drives at least one terminal portion of the terminal portions provided on two or more sides of the liquid crystal display element. A liquid crystal display device according to claim 1, wherein the liquid crystal display device is connected to a terminal portion on a side of the portion not facing the liquid crystal display element.