JPH05303109A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To make even a many-dot display cell, which requires many driving ICs, extremely small in size and facilitate its assembling process. CONSTITUTION:A segment substrate 10 where striped transparent segment electrodes are formed and a common substrate 20 where stripped transparent common electrodes are formed are united together opposite each other, and this liquid crystal display device has a 1st projection area 10A wherein at least one tail end side of the segment substrate 10 projects from the tail end side of the common substrate 20 and a 2nd projection area 20A where at least one tail end side of the common substrate 20 projects from the tail end side of the segment substrate 10; and plural slim type tabs 40 and 40 mounted with liquid crystal driving ICs 30 and 30 for making a specific display are fixed in the 1st and 2nd projection areas 10A and 20A, and a common display data signal supplied from a controller is supplied to the driving ICs 30 and 30 mounted on the tabs by electric conductors 43 and 43 formed on the projection areas 10A and 20A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a large panel COG structure.

[0002]

2. Description of the Related Art Recently, a liquid crystal dot matrix display body having a small size and a large number of dots has been used, but a large number of driving LSI chips are required to drive such a display body having a large number of dots. Conventionally, as a method of electrically connecting a multi-dot display body and a large number of drive LSI chips, a method of mounting a large number of drive LSI chips on a hard circuit board to which a liquid crystal display body is attached has been adopted.

[0003]

However, this method is
There is a limit to the wiring pattern pitch of the hard circuit board, and it is difficult to combine them into a small board. In addition, high precision is required for alignment between the rigid circuit board and the liquid crystal display, for example.
There are problems that assembly and manufacturing are difficult, the number of parts is large, and miniaturization and thinning are hindered, resulting in high cost.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to achieve a very small structure even in the structure of a liquid crystal display cell for displaying a large number of dots which requires a large number of driving LSIs. The purpose of the present invention is to provide a liquid crystal display device which has a simplified assembly process.

[0005]

[Means for Solving the Problems]
In order to achieve the object, a liquid crystal display device according to the present invention comprises a segment substrate on which stripe-shaped transparent segment electrodes are formed and a common substrate on which stripe-shaped transparent common electrodes are formed so as to face each other. At least one side edge of the board has a first protrusion area protruding from the common board end edge and at least one side edge of the common board has a second protrusion area protruding from the segment board end edge. A plurality of flexible substrates having liquid crystal driving ICs for performing predetermined display are fixedly attached to the first and second protruding regions, and conductive wiring formed on the first and second protruding regions. Is characterized in that each driving IC is interconnected.

[0006]

In the liquid crystal display device constructed as described above, a large number of ICs can be obtained by firmly connecting the flexible substrates having the liquid crystal driving ICs mounted on the protruding regions of both substrates.
Even for a liquid crystal cell for displaying a large number of dots, which requires the liquid crystal display device, it is possible to provide a liquid crystal display device that is extremely miniaturized and has a simplified assembly process.

[0007]

EXAMPLE A liquid crystal display device of the present invention will be described below based on the example shown in FIG. The liquid crystal display device of the present invention has a transparent segment electrode (not shown) as shown in FIG.
A segment substrate (10) on which is formed, and a common substrate (20) on which a transparent common electrode (not shown) is formed
And the protruding regions (10A) (2) of both substrates (10) (20)
LCD driver ICs (30) (30) mounted on
A flexible substrate (40) (40) to which is adhered.

A glass substrate is used for each of the segment substrate (10) and the common substrate (20), and a transparent electrode material such as indium oxide is attached to the surface of the segment substrate (10) and the common substrate (20) by a method such as a sputtering method to form a segment having a desired shape. Electrodes and common electrodes are formed. Both boards (10) (20)
Although not clearly shown in the figure, the segment electrodes and the common electrodes formed above are formed in a plurality of stripes at fine intervals over the entire display region of the substrates (10) and (20). Then, the lead-out wirings (11) (21) extending from the segment electrodes and the common electrodes formed on the display region are extended to at least one peripheral edge of the substrates (10) (20). That is, the routing wiring (1
1) and (21) are formed to extend in the protruding regions (10A) and (20A) of both substrates (10) and (20).

The protruding region (10A) formed on the segment substrate (10) is formed so as to protrude from the peripheral edge of the common substrate (20), and the protruding region (20A) formed on the common substrate (20) is The segment substrate (10) is formed so as to protrude from the peripheral edge. This protruding area (10
A) and (20A) are formed on one side or two sides of both substrates (10) and (20).

The protruding regions (10) of both substrates (10) (20)
On the (A) (20A), elongated flexible substrates (40) (40) having a width of, for example, about 5 to 10 mm are fixedly mounted. That is, the lead-out wirings (11) (21) and the flexible substrates (40) (40) extending on the protruding regions (10A) (20A) are fixed by an anisotropic conductive adhesive or the like. As the flexible substrates (40) (40), those formed of a thin film of polyimide resin or the like are used,
A pattern of a desired shape is formed on the surface by copper foil.

That is, the flexible substrate (40) (40)
Above the first wiring (41) connected to the routing wirings (11) and (21) and the second wiring for bypassing a common data signal or power supply signal supplied from the controller.
Wiring (42) is formed. The driving ICs (30) and (30) for driving the liquid crystal are mounted on the flexible substrate (40) (40) at substantially the center thereof, and the first wiring (41) of the flexible substrate (40) (40) is mounted. )
(41) and the second wirings (42) and (42) are connected (hereinafter, the flexible substrate (40) is simply referred to as the tab (30).
That).

A plurality of the above-mentioned tabs (40) (40) are fixed on the protruding regions (10A) (20A) formed on both substrates (10) (20) for displaying a large number of dots. .. At this time, the second wirings (42) formed on the respective tabs (40) are electrically connected by the conductive wirings (43) (43) formed on the protruding regions (10A) (20A), respectively. The common display data signal is the second wiring (42).
It is supplied to each drive IC (30) (30) through (42) and conductive wiring (43) (43).

Electrode terminals for connecting to flexible lead wires (50) extending from a mother substrate (not shown) are formed at the outermost ends of the protruding regions (10A) (20A). Each drive IC (30) is mounted on the mother board.
A control IC such as a microcomputer for supplying desired data to the (30) is mounted, and as described above, the lead wire (50) and the projecting regions (10A) (20A) of both boards (20).
When the electrode terminals formed on A) are connected with an adhesive, predetermined display data are supplied to each drive IC (30) from the controller mounted on the mother board, and the IC (3
From 0), the segment signal and the common signal based on the data are output to each segment electrode and the common electrode, and desired dot display is performed.

[0014]

As described above in detail, according to the present invention,
A large number of driving ICs are required by providing conductive wirings for supplying a common data signal supplied from a plurality of controllers to the respective driving ICs in the protruding areas of both substrates and mounting tabs in the protruding areas. Even with a multi-dot display cell, it is possible to provide a display device that is extremely compact and has a simplified assembly process.

Since the slim tabs are directly mounted on both substrates, the weight and size of the cell can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a liquid crystal display device of the present invention.

[Explanation of symbols]

 (10) Segment board (20) Common board (10A) (20A) Projection area (30) Driving IC (40) Tab (50) Lead wiring

Claims (2)

[Claims] 1. A segment substrate on which a striped transparent segment electrode is formed and a common substrate on which a striped transparent common electrode are formed so as to face each other, and at least one side end edge of the segment substrate is A first projecting region projecting from the end side of the common substrate and at least one side end side of the common substrate having a second projecting region projecting from the end side of the segment substrate; A plurality of flexible substrates on which liquid crystal driving ICs for performing a predetermined display are fixed, and conductive wirings formed on the first and second protruding regions are provided on the respective driving ICs. A liquid crystal display device characterized by being interconnected. 2. A segment substrate having a stripe-shaped transparent segment electrode formed thereon and a common substrate having a stripe-shaped transparent common electrode formed opposite to each other, and at least one side edge of the segment substrate is the end side. A first projecting region projecting from the end side of the common substrate and at least one side end side of the common substrate having a second projecting region projecting from the end side of the segment substrate; A plurality of slim type tabs, each having a liquid crystal driving IC for performing a predetermined display, are fixed on the protruding area of the above, and the driving wirings mounted on the tabs are connected by the conductive wiring formed on the protruding area. A liquid crystal display device characterized in that a common display data signal supplied from a controller is supplied to the IC.