JPH0755539Y2 - Multi-layer liquid crystal display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a multi-layer liquid crystal display in which two polymer film substrates are extended from a display area and a pair of electrode lead-out portions are formed on the liquid crystal display panel. The present invention relates to a panel, for example, a multi-layer liquid crystal display panel suitable for use in protective liquid crystal glasses for welding, a liquid crystal shutter for a three-dimensional television, and the like.

(Prior Art) Generally, a liquid crystal display panel is used in a wide range of fields such as OA equipment and measuring instruments as a small, lightweight, and low power consumption display device. Among these liquid crystal display panels, the liquid crystal display panel for displaying figures and characters has a large number of pixels,
In recent years, relatively pixels such as sun visors for automobiles, protective glasses for welding, protective glasses for lasers, helmet shields for motorcycles, ski goggles for skis and motorcycles, or liquid crystal shutters for three-dimensional television, etc. The ones with less are being commercialized or researched. Further, in particular, protective liquid crystal glasses for welding, protective liquid crystal glasses for lasers, and liquid crystal shutters for three-dimensional television, which are required to have relatively low transmittance and high contrast, have been commercialized or researched by constructing liquid crystal panels laminated. There is.

As a conventional multi-layer liquid crystal display panel of this type, there is one shown in FIGS. 7 and 8, for example. In FIG. 7, one end portion (upper end portion) of the polymer film substrates 1 and 2 is extended from the other end to form electrode lead-out portions 3 and 4, respectively, and the electrode lead-out portions 3 and 4 are made of glass. Transparent electrodes 3a, 3b for applying an electric field to the liquid crystal panels 5, 6,
4a and 4b are formed respectively. One of the transparent electrodes 3a and 3b is collectively provided on the upper end portion of the substrate 1 in order to concentrate the electrodes for applying an electric field to the liquid crystal panel 5, which is the same as the other transparent electrodes 4a and 4b. Is also the same. Therefore, in the case shown in FIG. 7, the liquid crystal panel 5,
It is a two-layer liquid crystal display panel in which 6 are stacked. In such a two-layer liquid crystal display panel, connectors 7 and 8 matching the thicknesses of the electrode lead-out portions 3 and 4 are fitted as shown in FIG. 8, and an electric field from an external drive circuit (not shown) is applied to the liquid crystal panels 5 and 6, respectively. Apply.

(Problems to be solved by the invention) However, in such a conventional multilayer liquid crystal display panel, a polymer film is used as a substrate, electrodes are formed on the substrate, and a connector is fitted therein. Since the transparent electrode on the substrate made of polymer film is weaker to friction than the liquid crystal panel made of glass, there is a problem that the connection reliability of the connector is low.

As a result of earnest studies on such problems, the inventor of the present invention has found a meaningful solution from a plurality of devices relating to the liquid crystal display panel previously proposed by the applicant of the present invention.

One of them is a liquid crystal optical element (see Japanese Patent Application No. 61-303207).
With this, PF-LCD (PF-Liquid Cr
For the purpose of preventing foreign matter from entering in the pre-cutting process with the ystal display) and improving the yield, the electrodes of the upper and lower substrates of the same shape are extended in the same direction, and the external circuit substrate is inserted between them. According to this method, when electrodes are used on the external circuit board, for example, EPC copper electrodes (plated with solder, gold, nickel, etc.), they are resistant to friction even when the connector is inserted and are connected. The reliability of is also improved.

The other one is a liquid crystal display device (see Japanese Patent Application No. 62-15779).
In this structure, a cutout portion is provided in the electrode lead-out portion to serve as a connection portion of the external circuit board for the purpose of preventing disconnection due to bending of the external circuit board.

(Object of the Invention) Therefore, the present invention aims to provide a multi-layer liquid crystal display panel which can improve the reliability of connection with a connector with a simple structure by applying the above-mentioned prior application to a multi-layer liquid crystal panel. I am trying.

(Structure of the Invention) In order to achieve the above object, the present invention is a liquid crystal display panel in which two polymer film substrates having a transparent electrode inside are extended outside the display area together with the transparent electrode to form an electrode extraction portion. In a multi-layer liquid crystal display panel, wherein a plurality of electrode lead-out portions of the multi-layer liquid crystal display panel are arranged in the same lead-out direction and apart from each other in the panel surface direction, and the plurality of electrode lead-out portions are provided. It is characterized in that a flexible connection circuit board which is inserted over and connects the electrode extraction portion and an external drive circuit is provided.

Hereinafter, a detailed description will be given based on an embodiment of the present invention.

1 to 5 are views showing a first embodiment of the present invention. First
In the figure, reference numeral 11 denotes a liquid crystal display panel in which two polymer film substrates are extended from the display area and a pair of electrode lead-out portions 11a are formed. The multilayer liquid crystal display panel according to this embodiment is shown in FIG. As described above, the same liquid crystal display panel 12 as the liquid crystal display panel 11 is layered on top of each other. The liquid crystal display panel 12 also has a pair of electrode lead-out portions 12a. Each electrode extraction part 11a, 12
Thermocompression type anisotropic conductive film connector 13a,
Flexible printed circuit boards (hereinafter referred to as 13b, 14a, and 14b (joints made of an anisotropic conductive film) are temporarily fixed.
FPC) 15 has been inserted. That is, as shown in FIG. 3 which is an enlarged view of the central portion of FPC15,
On the right side of the figure, anisotropic conductive film connectors 13a and 13b are temporarily fixed and arranged on both sides thereof as shown by solid arrows, and in this temporarily fixed state, a pair of electrode lead-out portions 11a are provided. It is inserted so that it is sandwiched between
This also applies to the left part of FPC15. FPC15
Is a connection circuit board inserted across a plurality of electrode lead-out portions 11a and 12a that are spaced apart in the panel surface direction in each of the adjacent liquid crystal display panels 11 and 12 (separated when the panel surface is viewed from the front). Electrodes 16a and 16b for electrically connecting an external drive circuit (not shown) and the liquid crystal display panels 11 and 12 are provided on both sides of the FPC 15. Electrodes 16a, 1
6b is plated with copper, solder, gold, nickel or the like, and the opposing portions of the electrodes 16a, 16b are cut out to form non-conductive cutouts 17. Here, the FPC 15 may be made of another material such as polyimide, polyester, or glass epoxy as long as it is thin and can be inserted between the electrodes of the liquid crystal display panels 11 and 12. FPC15 is a liquid crystal display panel 11,1
The state of being sandwiched between the two electrodes is shown in Fig. 4,
A connector 18 is fitted in the central portion of the FPC 15 (see FIG. 5), and an electric field is applied from the external drive circuit through the connector 18.

In the multi-layer liquid crystal display panel having such a structure, first, a polymer film with a transparent electrode is cut into a work size, and an end portion thereof is extended from the display area to form a pair of electrode extraction portions 12a. Liquid crystal display panel 1 stacked
1 and 12 After that, the electrodes 16a, 16 are formed by etching or the like.
The FPC 15 having the b formed therein is inserted between the electrode lead-out portions 11a and 12a of the liquid crystal display panels 11 and 12, the connector 18 is fitted into the FPC 15 and an electric field is applied from an external drive circuit. In the case of such a multi-layer liquid crystal display panel, the FPC 15 is firmly held by being sandwiched between the electrode lead-out portions 11a, 12a of the adjacent liquid crystal display panels 11, 12, so that sufficient strength is ensured and unlike the conventional case. The reliability of the connection of the connector 18 is significantly improved. Further, since the liquid crystal display panels 11 and 12 do not require a pre-cut process, they have a simple structure and are easy to create.

FIG. 6 is a diagram showing a second embodiment of the present invention. This embodiment is an example in which one panel has a large number of electrodes. In FIG. 6, reference numerals 21 and 22 denote liquid crystal display panels respectively. The liquid crystal display panel 21 has one electrode lead-out portion 21a, and the liquid crystal display panel 22 has two electrode lead-out portions 22a and 22b. The FPC 23 is inserted into the electrode extraction portion 21a and the electrode extraction portion 22a, and the FPC 24 is inserted into the electrode extraction portion 21a and the electrode extraction portion 22b. Then, connectors (not shown) are fitted into the FPCs 23 and 24, respectively, as in the first embodiment. By the way, when the number of electrodes is large as described above and the distance between the electrodes of the adjacent panels is long, the strength of the connector portion (connection portion) of the FPC against strain is reduced. Electrode extraction part
Since the distance between 21a, 22a, and 22b is short, FPC23, 24
Sufficient strength is secured, and the same effect as in the first embodiment can be obtained.

Although the FPC is divided into two in the second embodiment, it may be formed with one FPC.

Further, in each of the above-mentioned embodiments, the anisotropic circuit film connector is used to connect the external circuit and the panel electrode. However, the invention is not limited to this, and connection by pressing a clip or the like is also possible. Instead, it may be soldered. Further, the FPC may also serve as the connector.

Furthermore, in each of the above-mentioned embodiments, a two-layer structure is shown, but it goes without saying that a multilayer liquid crystal display panel having more layers can be similarly constructed.

(Effect) According to the present invention, a flexible connection circuit board is inserted over a plurality of electrode lead-out portions that are spaced apart in the panel surface direction of the multi-layer liquid crystal display panel, and the connection circuit board is desired by the adjacent electrode lead-out portions. It is possible to support both ends in both positions, greatly improve the reliability of the connection part, simplify the structure, and even connect the connection circuit board and the external drive circuit. Can be easy.
Further, since the connection circuit board is inserted into the electrode extraction portion of the liquid crystal display panel to support the connection circuit board from both sides,
The connection between the electrode lead-out portion and the connection circuit board is strengthened, and the reliability of the connection of the electrode lead-out portion can be significantly improved in the multilayer liquid crystal display panel using the polymer film substrate.

[Brief description of drawings]

1 to 5 are views showing a first embodiment of a multi-layer liquid crystal display panel according to the present invention. FIG. 1 is a perspective view of the liquid crystal display panel, and FIG. 2 is a state in which the liquid crystal display panels are stacked. FIG. 3 is an enlarged view of a main part of the FPC, FIG. 4 is a perspective view showing a state before connecting a connector to the liquid crystal display panel, and FIG. 5 is a view showing a connector connected to the liquid crystal display panel. FIG. 6 is a perspective view showing the latter state, FIG. 6 is a perspective view showing a second embodiment of the multi-layer liquid crystal display panel according to the present invention, showing the state in which the liquid crystal display panels are stacked, and FIGS. It is a figure which shows a display panel, FIG. 7 is a perspective view which shows the state before connecting the connector, and FIG. 8 is a perspective view which shows the state after connecting the connector. 11, 12, 21, 22 ... Liquid crystal display panel, 11a, 12a ... Electrode extraction part, 13a, 13b, 14a, 14b ... Anisotropic conductive film connector (anisotropic conductive film, connection part), 15, 23, 24 …… FPC
(Connecting circuit board), 16a, 16b ... Electrode, 18 ... Connector, 21a, 22a, 22b ... Electrode extraction part.

Claims (3)

[Scope of utility model registration request] 1. A multi-layer liquid crystal display panel in which two polymer film substrates each having a transparent electrode inside are extended outside the display area together with a transparent electrode to form a liquid crystal display panel in which an electrode lead-out portion is formed. The plurality of electrode lead-out portions of the multi-layer liquid crystal display panel are arranged so as to be separated in the same lead-out direction and in the panel surface direction, and are inserted over the plurality of electrode lead-out portions, and the electrode lead-out portion and the outside A multi-layer liquid crystal display panel, characterized in that a flexible connection circuit board for connecting to a drive circuit is provided. 2. The utility model registration claim 1, wherein the connection circuit board is a flexible printed board in which a joint portion to be inserted into the electrode lead-out portion is formed of an anisotropic conductive film. Multi-layer liquid crystal display panel. 3. The utility model registration claim according to claim 1, wherein the connection circuit board is connected to an external drive circuit between adjacent electrode lead-out portions which are separated in the panel surface direction.
The multi-layer liquid crystal display panel according to item.