JPS6249392A - Liquid crystal display unit - 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 The present invention relates to a liquid crystal display device in which a large screen is formed by combining a plurality of liquid crystal display cells.

Traditionally BACKGROUND ART Consideration is being given to increasing the screen size of liquid crystal display devices.

However, if a sufficient pixel density is maintained and the display area is enlarged, the number of electrodes taken out increases accordingly, making driving difficult. In particular, in the case of multiplex drive, there is a limit to the duty ratio, which is a big constraint.

Further, problems in processing and assembly also occur.

Therefore, the screen is divided into several parts and liquid crystal display cells are individually arranged in each part to make the screen larger. FIG. 5 is a cross-sectional view of such a conventional liquid crystal display device, showing a combination of two liquid crystal display cells. A cell having a structure similar to that of a liquid crystal display cell 61 in which upper and lower glass substrates 55 and 57 having transparent electrodes 51 and 53 are placed apart and facing each other, a seal portion 31 is provided on the outer periphery, and a liquid crystal 33 is sealed inside. Two liquid crystal display cells 63 are arranged in parallel. The upper substrate 51 protrudes from the display surface of the liquid crystal display cell, and an electrode extraction terminal portion 59 is formed on the back surface of the protrusion 55a so as to communicate with the transparent electrode 55.

The electrode extraction terminal section 59 is connected to the liquid crystal drive section 35 via a zebra connector 65, and a transmissive liquid crystal display is performed using the back light source 37.

In this case, the range indicated by A in FIG. 5 becomes the effective image area, but within this area there is an area like B that does not contribute to the display, and the part 6B where the image is discontinuous is the seal part 3.
Efforts have been made to reduce the width of these electrode terminals 1 and 59, but currently each liquid crystal display cell requires a width of about 1 mm. Part B becomes 21. Also,
In FIG. 5, by reversing the direction of the second liquid crystal display cell 63 from left to right, the size of section B can be reduced to about half, but this will still prevent the generation of a section of about 1 mm that does not contribute to the display. do not have. Furthermore, it is possible to reduce the portion that does not contribute to display by overlapping the ends of adjacent liquid crystal display cells, but since liquid crystal display cells using glass substrates are thick, approximately 1 mm or more, ,
It is practically impossible to adopt this superposition method.

An object of the present invention is to prevent areas that do not contribute to display from appearing between the modules in a liquid crystal display device that has a large screen by combining liquid crystal display modules.

The liquid crystal display device of the present invention comprises a plurality of flexible film substrate liquid crystal display cells in which at least one substrate protrudes from the display surface of the liquid crystal display cell, and an electrode extraction terminal portion is provided on the protrusion. A plurality of liquid crystal display cells are arranged in combination by bending the electrode lead-out terminal portions of the liquid crystal display cells so that the display surfaces of each liquid crystal display cell are connected.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 2 is a perspective view of a liquid crystal display cell used in the present invention, and FIG. 3 is a cross-sectional view taken along the line --. An upper substrate 11 and a lower substrate 21 made of a flexible plastic film are arranged facing each other and separated from each other.

A striped signal line electrode 13 is formed on the upper substrate 11, and this electrode 13 extends from the display section 10 to the protrusion 11a of the upper substrate 11, and an electrode extraction terminal section 15 is formed on the back surface of the upper substrate 11. There is. Similarly, a striped scanning line electrode 23 is formed on the lower substrate 21, and this electrode 23 extends to the protrusion 21a of the lower substrate 21, and an electrode extraction terminal portion 25 is formed on the surface of the lower substrate 21. There is. A seal portion 31 is formed on the outer periphery of this open substrate 11, 13, and a liquid crystal 33 is sealed inside to constitute a liquid crystal display cell.

The inside of the seal portion 35 of the liquid crystal display cell forms an effective display area.

In the above configuration example, a matrix display has been described, but a segment display may also be used. In addition, drive methods include static drive, multiplex drive,
Any method such as active matrix driving may be used.

FIG. 1 is a perspective view showing a liquid crystal display module using such a liquid crystal display cell. The electrode lead terminal portions 11a and 21a of the liquid crystal display cell 41 are bent vertically and are connected to the liquid crystal drive portion 35 due to the stress caused by the zero bending.
Since there is a possibility that the transparent conductive film of the electrode extraction terminal part may break, plating treatment may be performed to reinforce it. 37 is a back light source. In the surface direction of the display section 10 of this liquid crystal display module, electrode extraction terminal sections 11a and 21 are provided, unlike in FIG.
Since there is no a, by connecting liquid crystal display cells of other modules adjacent to this liquid crystal display cell 41, it is possible to realize a large-screen liquid crystal display device with fewer parts that do not contribute to display.

That is, since only the width twice the width of the seal portion 31 serves as a break between the two display cells 41, a large screen display with few discontinuous portions can be performed.

Furthermore, by utilizing the thin cell thickness of the flexible film substrate liquid crystal display cell, it is possible to further improve screen discontinuity caused by the seal portion. Also, if a transparent electrode is formed up to the part that touches the seal part to make it an effective display area, various problems will occur, so it is practical to make an area slightly smaller than the inside of the seal part as an effective display area, but in this case, The discontinuity of the effective display area can also be improved. FIG. 4 is an exploded perspective view showing a method of arranging such liquid crystal display cells, in which adjacent liquid crystal display cells 41, 43
are arranged so that their edges partially overlap. This overlap is done so that their effective display areas do not overlap. By doing so, the effective display areas of adjacent liquid crystal display panels are continuous, and there is no part between them that does not substantially contribute to display. Because the plastic film substrate is as thin as about 100 μm,
Even if display cells are partially overlapped, the difference in level is not noticeable.

Note that although members such as polarizing plates are omitted in the above embodiments, these are appropriately arranged depending on the operation mode and the like.

Furthermore, although a case has been described in which a protrusion, that is, a terminal surface for taking out an electrode is formed on both the upper and lower substrates, the same applies to a case where the terminal surface for taking out an electrode is formed on one surface of either the upper substrate or the lower substrate. In this case, electrodes necessary for driving are routed around one electrode extraction terminal surface.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one liquid crystal display module constituting the liquid crystal display device of the present invention. FIG. 2 is a perspective view showing an example of the structure of a liquid crystal display cell used in the present invention, and FIG. 3 is a sectional view taken along the line m--m. FIG. 4 is a partially exploded perspective view showing another example of arrangement of the liquid crystal display cell of the present invention. FIG. 5 is a sectional view showing a conventional method of combining liquid crystal display modules. 11...Top board 11a, 21a...Protrusion
Part 13...Signal line electrode 15.25...Electrode extraction terminal part 21...Lower board 23...Scan ai'!
! Pole 31...Seal part 33...Liquid crystal 35...
・Liquid crystal drive unit 37... Back light source 41.43...
lcd display cell

Claims (1)

[Claims] 1. Using a plurality of flexible film substrate liquid crystal display cells in which at least one of the substrates protrudes from the display surface of the liquid crystal display cell, and an electrode lead-out terminal part is provided on this protrusion, the electrode lead-out terminal part of the liquid crystal display cell is used. 1. A liquid crystal display device characterized in that a plurality of liquid crystal display cells are arranged by bending the liquid crystal display cells so that the display surfaces of each liquid crystal display cell are connected.