JPS61175673A - Conductive high polymer 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 (a) Field of Industrial Application This invention relates to a display device using a conductive polymer material.

(b) Prior Art Generally, display devices include ECD (electrochromic display) and liquid crystal display devices. This EC
D consists of filling an electrolytic solution into a case such as a glass substrate, and also installing a transparent electrode plate and a counter electrode plate in parallel.A voltage is applied between both electrode plates, and various characters, etc. are printed by redox reaction. configured to display.

In addition, a liquid crystal display device is made by sealing liquid crystal between a pair of transparent electrode plates and laminating glass substrates, polarizers, etc. An electric field is applied to this liquid crystal to change the molecular arrangement and display characters, etc. is configured to do so.

(c) Problems to be Solved by the Invention In the display device described above, since a pair of electrode plates face each other in a sandwich-like manner to form a cell, it is necessary to use a spacer, making it suitable for large-screen display. The problem was that there was no.

Furthermore, since the two electrode plates face each other, it becomes thicker, and there are many parts such as spacers, and the display color is one color, so there is little variation.

Moreover, since a transparent electrode plate must be formed,
The disadvantage was that the materials used were limited.

(d) Means and operation for solving the problem The present invention is characterized in that a first electrode film and a second electrode film are formed on an insulating substrate, and the first electrode film is divided into a plurality of segments constituting a display symbol. A coating film made of a conductive polymer material is formed on the surface of at least the first electrode film of the two electrode films, and both the electrode films are housed in a transparent case, and the case is filled with an electrolyte. The present invention is characterized in that a voltage is applied between the segments of the first electrode film and the crotch of the second electrode to change the color of at least the covering film of the first electrode film to display various symbols.

(E) Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

As shown in Figures 1 and 2, 1 is a conductive polymer display device that displays two-digit numbers. This conductive polymer display device 1 includes an insulating substrate 2, a first ift electrode film 3, a second electrode film 4, a covering film 5, and an insulating film 6, and is covered with a transparent case 7.

The insulating substrate 2 is a flat plate made of an insulating material such as plastic or glass.

The first electrode film 3 is formed on the upper surface of the insulating substrate 2, as shown in FIG. ing. This first electrode film 3 is divided into seven segments 3a, and each segment 3a is connected to a terminal portion 3c at the end of the substrate 2 via a lead portion 3b.

As shown in FIG. 4, the insulating film 6 is formed on the first electrode film 3 and around each segment 3a. This insulating film 6 is made of, for example, a Si OX film, and has a rectangular frame portion 6a around each segment 3a and seven segments 3.
The lead portion 3b is covered with an intermediate portion 6b between the lead portions 3a and 6b.

As shown in FIG. 5, the second electrode film 4 is formed on the insulating substrate 2 and the insulating film 6, and is made of metal such as Ti, Cr, Ni, etc. like the first electrode film 3. has been done. This second electrode film 4 is formed around each segment 3a, and a rectangular frame part 4a and an intermediate part 4b are formed on the insulating film 6, and a terminal part 4C is formed at the end of the substrate 2. is,
Furthermore, a central portion 4d is connected to the frame portion 4a via a lead portion 4e within the seven segments (7 segments) 3a.

The coating film 5 is made of a conductive polymer such as polythiophene or polypyrrole, and covers each segment (3a) of the first electrode film 3.
Frame portion 4a, intermediate portion 4b, and center portion 4 of the upper and second electrode films 4
It is configured on d. This coating film 5 is made of, for example, 0.5 mA/c+ in a solution of IM aniline+2MH (1) with the terminal portion 3c14C of both electrode films 3.4 as an anode electrode.
It is formed by electrolytically polymerizing for about 30 seconds by passing a current of about J.

The transparent case 7 is formed on the frame portion 4a of the second electrode film 4, and covers the frame portion 4a, the segment 3a of the first electrode film 3, and the like. The case 7 is filled with an electrolytic solution 8 such as acetic acid (pH about 1).

Next, the display operation of this conductive polymer display device 1 will be explained.

First, the terminal portion 3C of the first electrode film 3 is used as an anode, and the second electrode film 4 is used as an anode.
When a voltage is applied using the terminal portion 4C as a cathode, the coating film 5 of the segment 3a in the first electrode film 3 turns green, and the second
The coating film 5 on the frame portion 4a, middle portion 4b, and center portion 4d of the electrode film 4 changes color to light yellow due to the redox reaction.

On the other hand, when the first electrode film 3 is used as a cathode and the second electrode film 4 is used as an anode, the color change is reversed, and the coating film 5 of the segment 3a turns pale yellow, and the coating film 5 of the surrounding frame portion 4a etc. colored green.

Then, by selecting the terminal portion 3C of the first electrode film 3 and applying a voltage, a number up to two digits, for example 5 or 32, is displayed. Furthermore, this display has a memory function of approximately one day even when the power is turned off.

Although numbers are displayed in this embodiment, the conductive polymer display device 1 of the present invention may also display various symbols such as letters and pictures.

Alternatively, the coating film 5 made of a polymeric material may be formed only on the first electrode film 3 so that only the segments 3a change color.

Furthermore, the second electrode film 4 may be formed on the back surface of the substrate 2.

B) Effects of the Invention As described above, according to the conductive polymer display device of the present invention, the first electrode film is divided into a plurality of segments, and the coating film made of the conductive polymer material is applied to at least the segments. Because of the structure, the coating film of each segment changes color when a voltage is applied, and various numbers, letters, etc. can be displayed.

In particular, there is no need to provide a spacer between a pair of electrode plates as in the past, and a pair of electrode films can be formed on the same plane, making it possible to display large-sized displays while also being ultra-thin. It is possible to aim for Furthermore, since the number of parts can be reduced, it is possible to perform harmonization at low cost.

Furthermore, the electrode film does not need to be transparent, and only needs to be an acid-resistant metal, so a wide range of materials can be used.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of a conductive polymer display device, FIG. 2 is a cross-sectional view taken along line nn in FIG. 1, and FIG. 3 is a diagram showing a first electrode film. FIG. 4 is a plan view of the insulating film, and FIG. 5 is a plan view of the second electrode film. DESCRIPTION OF SYMBOLS 1: conductive polymer display device, 2: insulating substrate, 3: first electrode film, 3a: segment, 4: second electrode film, 5: coating film, 72 transparent case, 8: electrolyte solution. Patent applicant Tateishi Electric Co., Ltd. Agent
Patent Attorney Shigeru Nakamura Shin 7: Transparent Goomata

Claims (1)

[Claims] (1) A first electrode film and a second electrode film are formed on an insulating substrate, the first electrode film is divided into a plurality of segments constituting a display symbol, and at least one of the first electrode films of both the electrode films is formed. A coating film made of conductive polymer material is formed on the surface,
Furthermore, both electrode films are housed in a transparent case, and this case is filled with an electrolytic solution, and various symbols are displayed by applying a voltage between the segments of the first electrode film and the second electrode film. Characteristic conductive polymer display device.