JPS597343A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain a device small in size and large in display area, by forming at least one of substrates of a liquid crystal display panel having a terminal part with a plastic film, bending said part to the side opposite to the display part of the panel, and connecting it with the substrate of circuits under the panel. CONSTITUTION:The substrate 3 having terminal parts 4 of the substrates 2, 3 of the liquid crystal panel 1 are constituted with elastic and foldable plastic plates or the like. These parts 4 are bent to the underside opposite to the display face of the panel 1 and overlaid on the terminal parts on a circuit substrate B, and the parts except the electrical connection parts are stuck with an insulating hot-melt adhesive. In order to prevent disconnection of transparent electrode films, etc., for example, an insertion member 6c, such as silicone rubber, may be used to connect them with the substrate 5c, thus permitting reduction of a number of connection parts, enlarging of a diaplay area, and easy manufacture of a small-sized display device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device. The present invention relates to a liquid crystal display device in which a frame substrate is made of plastic.

Conventionally, as shown in FIG. 6, in a liquid crystal panel 11, a liquid crystal is sandwiched between two substrates 12 and 13, one of the substrates 13 is extended to form a terminal, and the terminal is connected to an external substrate 14. The above liquid crystal panel was driven. However, the board 12.13
Since the substrate was made of glass, the substrate was hard and the substrate 1
The method of connecting the terminal portion 14 formed on the liquid crystal layer fl11 of No. 6 and the external substrate 15 is limited to a method using conductive rubber 16, etc., it is difficult to downsize, and the degree of freedom of dispensing is limited. , it had drawbacks such as requiring many parts for connection.

The present invention eliminates this drawback. The present invention provides a liquid crystal display device that is miniaturized by using a plastic film for at least the substrate 14 having terminal portions among the substrates constituting the liquid crystal panel.

The present invention facilitates connection between the liquid crystal panel and an external circuit by bending the terminal portions at appropriate angles.

FIG. 1 shows a first embodiment of the liquid crystal display device of the present invention.

In the liquid crystal panel 1, a liquid crystal layer is sandwiched between substrates 2 and 3, the substrate 3 having at least a terminal portion 4 is made of a plastic substrate, and the terminal portion 4 of the substrate 6 is bent in the opposite direction. The terminal portion 4 of the liquid crystal panel 1 is connected to the circuit board 5A.

In this case, since the board 6 is a plastic board and has elasticity, there is an advantage that connection can be made without using a conductor (rubber bar 916 in FIG. 6). Also, l'fk
Since the terminal section 4 of the crystal panel 1 is located on the back side of the liquid crystal panel, there is an advantage that the terminal section and the entire device can be miniaturized.

FIG. 2 shows a second embodiment of the liquid crystal display device of the present invention.

At least one side of the terminal portion of the liquid crystal panel 1 is bent to the back side of the panel. FIG. 2 shows an example in which terminal portions 4 are provided on two sides of the panel, and both terminal portions are bent toward the back side of the panel.

The substrate 5B on which at least an IC for driving the liquid crystal panel 1 is mounted is placed on the display side of the liquid crystal panel 1, and has a size smaller than the size of the panel.
There is an advantage that the ratio of the effective display surface f can be increased compared to the size of the entire liquid crystal display device as seen from the display part fl (II).This also has the advantage that the terminal part 4 is bent to the back side of the liquid crystal panel, and the drive circuit This is because the substrate 5B on which is mounted can also be provided on the back side of the panel.

FIG. 3 shows a sixth embodiment of the liquid crystal display device of the present invention. The bent part of the terminal of the liquid crystal panel 1 (Ct, [11 (4
A member 6C is inserted in order to provide a rounded shape. A substrate 5C on which a driving circuit is mounted is provided below the liquid crystal panel 1.

If this is done, the transparent conductive film will be disconnected at the terminal bent portion of the board, and the driving electric signal transmitted from the circuit board 5C to the terminal portion 4G will not be transmitted to the display portion. This has the advantage of preventing G. Also,
By making the insertion member 6C of silicone rubber, urethane, etc., and giving it elasticity, the electrical connection between the panel 1 and the substrate 5C can be made more complete.

FIG. 4 shows a fourth embodiment of the present invention. This is an example in which the insertion member 6C shown in FIG. 6 is made smaller and inserted only into the terminal portion 4 of the liquid crystal panel 1.

This has the advantage that the amount of insertion portion f=4'6D used can be reduced. Further, by constructing the insertion member 6D from an elastic member such as silicone rubber or urethane as shown in FIG. 3, the electrical connection between the panel 1 and the substrate 5D can be made more complete.

FIG. 5 shows a fifth embodiment of the liquid crystal display device of the present invention.

The circuit board 5E on which the drive circuit is mounted and the panel 1 are the board 5.
The board 5E is extended to the side opposite to the terminal section of the panel 1.

In this way, for example, right below the panel 1 of the board 5E,
By mounting an IC or the like on the side opposite to the panel, there is an advantage that the ratio of the effective display area can be increased compared to the size of the liquid crystal display device viewed from the display surface side.

Note that, among the substrates 2 and 3 constituting the liquid crystal panel 1, the substrate 3 having at least the terminal portion 4 is preferably made of a biaxially stretched polyester film t having no optical rotation. Polyester film has advantages such as low cost and easy handling since it is a film.

As described above, the liquid crystal display device of the present invention can reduce the size of the liquid crystal display device as viewed from the display side by bending the terminal portion of the liquid crystal panel and connecting it to the substrate on which the drive circuit is mounted. . The area of the effective display portion can be increased compared to the size of the liquid crystal display device. By using a plastic film for the substrate having at least the terminal portions, there are advantages such as being able to reduce the number of connecting parts such as conductive rubber.

[Brief explanation of drawings]

Fig. 1 shows the first embodiment of the invention Fig. 2 shows the second embodiment of the invention Fig. 3 shows the third embodiment of the invention Fig. 4 shows the fourth embodiment of the invention The figure shows a fifth embodiment of the present invention. FIG. 6 shows a conventional example. 1. ...Liquid crystal panel 2.6...Substrate 4 constituting the liquid crystal panel...
...Terminal section 5NO to 5E of liquid crystal panel ......Circuit board and above Applicant Shinshu Seiki Co., Ltd. Agent Ben (11th grader Mogami Tsutomu Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In the neck of the display device, the display device includes at least a display panel including at least two substrates, a display material sandwiched between the substrates, and a circuit board on which a driving element for driving the display panel is mounted. Among the substrates constituting the panel, at least a substrate having a terminal portion is made of a plastic film, the terminal portion of the substrate is bent toward a side opposite to the display surface of the panel, and the circuit board is disposed below the panel. . A liquid crystal display device, characterized in that the liquid crystal display device is connected to the panel via the terminal portion disposed below the panel.