JPS6247311B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides an optical display device in which at least one substrate is flexible, by establishing conduction from each substrate to each other, thereby increasing the reliability of conductivity. It concerns an enhanced optical display device.

[Prior art]

Conventionally, the conduction of optical display devices (hereinafter, a liquid crystal display device will be described as an example) is simpler and more compact. implementation. In consideration of man-hours and the like, conduction is not established from all of the cell substrates constituting the display device, but from a smaller number of substrates. Therefore, a substrate that is not directly conductive to the outside of the cell is connected to a substrate that is conductive through a conductive material. The conductive material used here is a mixture of low melting point metals (solders, etc.) and powders of Ag, Sn, etc., and adhesive. When melting low melting point metals to make conductive materials, it is necessary to process individual cells.Currently, powders such as Ag and Sn are mixed into adhesives, which can be processed in large numbers (number of cells) using printing methods. Printed on the board,
When the adhesive was fired after cell assembly, powders of Ag, Sn, etc. that had been uniformly dispersed in the adhesive settled, often resulting in poor conductivity. In addition, in both of the above methods, even if the initial conductivity is ensured, the adhesion between the substrate and the conductive material deteriorates over time.
(In particular, when mixing powders such as Ag and Sn into adhesives, it is necessary to mix powders such as Ag and Sn in order to obtain sufficient conductivity.
Because the mixture contains more than 80 Wt%, even if an adhesive is used that can secure sufficient adhesion to the cell substrate when used alone, it will peel off from the cell substrate over time, and the moisture that enters through the gap will cause the metal to peel off. Powder oxidizes. ) Poor continuity occurs.

Therefore, in order to prevent such poor conduction, conduction must be established separately for the upper and lower substrates.

In this case, if glass is used as the substrate,
It is impossible to deform the board, and conduction must be established from below for the upper board and from above for the lower board. When connecting cells to a circuit board, the circuit board must be deformed to connect each cell board from the bottom. The conductive parts (conductive rubber, etc.) that connect the cell board and the circuit board must be modified to provide continuity or to connect the cell board and the circuit board.
The conductive parts were complicated, and if the circuit board were to be deformed, it had the disadvantage of requiring significant changes from conventional ones.

〔the purpose〕

The present invention overcomes the above problems by making one of the upper and lower substrates a flexible substrate such as plastic, and deforming the end of the flexible substrate so that it is aligned in the same direction as the conductive portion of the other substrate. The present invention provides an optical display device that facilitates conduction and simplifies connection to a circuit board.

〔Example〕

The present invention will be explained in more detail with reference to Examples below.

Example 1 Figure 1. This will be explained along with FIG. A transparent conductive film is formed by a low-temperature sputtering method using a polarizing plate on an upper substrate 1 that protrudes laterally from the lower substrate and a lower substrate 2 that protrudes laterally from the upper substrate 1, and is patterned and aligned. Assemble the liquid crystal display cell.
As shown in FIGS. 1 and 2, when the assembled cell is mounted on a display device, the lower substrate 2 is deformed, and the connections are formed on a surface protruding from the lower substrate and on the same surface as the conductive film pattern. Similar to the upper substrate 1 having terminals, conduction is established from below. That is, the ends of the lower substrate that protrude laterally from the upper substrate are bent downward and inward to connect the connection terminals of the conductive film.
The connection terminals are oriented downward in the same direction as the connection terminals on the upper substrate, so that all the connection terminals can be electrically connected from below.

The material of the substrate may be flexible as long as it is flexible, and the shape and method of deformation are not limited to the embodiments. Optical display devices include the liquid crystal display device described in the example, EC (electrochromic)
EPID (electrophoretic display), light valves, etc. and EL
(electroluminescence), etc.

〔effect〕

As described above, the present invention provides an optical display device in which a display cell is formed by sealing a liquid crystal in a pair of upper and lower substrates, and a conductive film pattern is formed on the inside of each substrate. protruding laterally from the lower substrate, and a first connection terminal for connection to the circuit board is formed on the protruded upper substrate and on the same surface as the conductive film pattern;
The lower substrate is made of a flexible polymer resin film, and is protruded laterally from the upper substrate, and the protruding end of the lower substrate is bent downward and inward, and a circuit board is disposed on the outer end surface of the bent portion. Since a second connection terminal for connection is formed, it is possible to directly establish continuity between the conductive film pattern and the circuit board from each of the upper and lower substrates. A conductive agent for connecting the conductive film pattern to the other substrate is not required, eliminating the problem of poor conductivity due to deterioration over time, and exhibits an excellent effect of enabling high reliability as a liquid crystal display cell. Further, since the connection terminals of the upper and lower substrates can be connected from the same downward direction, the structure of the conductive portion can be easily realized by using the conventional circuit board as is.

[Brief explanation of the drawing]

FIG. 1 is a top view of a single-layer liquid crystal display cell section using a polarizing plate as a flexible substrate, and FIG. 2 is a cross-sectional view. 1... Upper board, 2... Lower board, 3... Seal material, 4... Conductive parts (for electrical connection between the cell board and the circuit board).

Claims (1)

[Claims] 1. In an optical display device in which a liquid crystal is sealed in a pair of upper and lower substrates to form a display cell, and a conductive film pattern is formed on the inside of each substrate, the upper substrate is located laterally than the lower substrate. A first connection terminal for connecting to a circuit board is formed on the protruded upper substrate and on the same surface as the conductive film pattern, and the lower substrate is made of a flexible polymer. The lower board is made of a resin film and projects laterally from the upper board, and the projecting end is bent downward and inward, and a second connection for connection to the circuit board is provided on the outer end surface of the bent part. An optical display device characterized in that a terminal is formed.