JPH0123171Y2 - - Google Patents

Description

[Detailed description of the invention] The invention consists of a first substrate and a second substrate each having an electrode.
The present invention relates to the background of a display device in which substrates are opposed to each other at a constant interval via a spacer.

BACKGROUND ART Conventionally, printing of protective glass or polarizing plates has often been used for the backgrounds and parting boards of watches, games, calculators, and the like. FIG. 1 is a cross-sectional view of a general game, calculator, etc. in which a pattern is printed on a polarizing plate. In the figure, 1 is a first substrate (front panel) made of a transparent material such as glass or plastic, 2 is a second substrate (back panel) made of a material that does not necessarily have to be transparent such as glass or ceramic, and 3
4 is a polarizing plate, 4 is a plurality of electrodes provided on the first substrate 1, and 5 is a counter electrode provided on the second substrate 2. 6 is a display material, 7 is a pattern printed on the polarizing plate 3, and 8 is a spacer for maintaining a constant distance between both substrates. In such a structure, the display portion and the background printed portion are separated from each other, resulting in an unnatural appearance. Furthermore, there was a drawback in that positional displacement was likely to occur when attaching the polarizing plate to the substrate. Furthermore, in the past, most parting plates used in watches were printed on the protective glass on the first substrate, or a colored metal plate was placed on top of the panel and held down by the protective glass. Because the partition boards are separated from each other, it looks strange. Moreover, the panel has the disadvantage that it becomes thicker and requires more time and effort in manufacturing.

The present invention was developed in order to eliminate the above-mentioned drawbacks of the conventional methods, and the background pattern is created by forming a pattern on a substrate using a conductive thin film and then electrodepositing a colored polymer. The purpose of this invention is to provide a display device that is precisely manufactured at the position of the object.

According to this method, a conductive thin film is patterned in a desired manner by vapor deposition using a mask, sputtering, etching, etc.
The polymer is selectively electrodeposited on the conductive portion, making it possible to obtain a pattern without pattern displacement. If the surface of the substrate used in this method is insulating,
By selecting a conductive thin film layer that has good adhesion to the substrate, there are no problems with its material or shape.

The method of electrodeposition of polymers, which is an important point of the present invention, will be described below. One method for electrodepositing a polymer on an electrode is to polymerize a monomer on the electrode. As an example of this method, there are reports of polymer films obtained by polymerizing various vinyl compounds on iron plates. (Metal Surface Technology, Vol.19, No.12, 1968)
Recently, research has been actively conducted on electrochemically polymerizing pyrrole, thiophene, etc. to create polypyrrole, polythiophene, etc. on electrodes.
However, such methods of electrochemically polymerizing monomers are not efficient. Another method for electrodepositing a polymer is to insolubilize and precipitate the polymer from a polymer solution onto the electrode. The principle of this method is to introduce a hydrophilic group, such as a carboxyl group, into a polymer, and then neutralize the carboxyl group with an inorganic alkali, organic amine, etc. to make it water-soluble. Then, the electrode is immersed in an aqueous solution of the water-soluble polymer,
When a voltage is applied, carboxyl anions dissociated in the aqueous solution undergo electrophoresis and react with protons generated by electrolysis of water on the electrode, thereby insolubilizing and precipitating the polymer. That is, the reaction shown in the following formula occurs on the anode, and polymer precipitation is observed.

In addition, a basic group (e.g. polyamine) is added to the hydrophilic group.
If it is neutralized and water-solubilized using an acid, on the contrary, polymer precipitation will be observed on the cathode. Examples of such polymers for electrodeposition include alkyd resins with carboxyl groups introduced, adducts of epoxy resin and maleic acid, polybutadiene resins with carboxyl groups, copolymers of acrylic acid or methacrylic acid and its esters, etc. is used. As for dyes, cationic dyes for acrylic resins such as Aizen, Cathilon, Diacryl, etc. (Dye Handbook) are effective for acrylic resins, and disperse dyes are effective for polyesters.

Hereinafter, the present invention will be specifically explained using examples.

(Example 1) FIGS. 2 and 3 are a front view and a cross-sectional view, respectively, of a panel of a polymer layer on which a pattern of a game background is electrodeposited. Reference numeral 9 denotes a first substrate made of a transparent material, on which a tin oxide transparent conductive film is formed by spray coating. The transparent conductive film is patterned into a required shape by etching to obtain electrodes for electrodeposition 15 and display electrodes 12. Next, polyester-melamine resin paint (Svia ED-3000 manufactured by Shinto Paint)
The first electrode 15 and the display electrode 12 were formed in an electrodeposition bath containing aqueous solution with a resin solid content of 10% by weight.
Substrate 9 is immersed. Among the patterned electrodes, the electrodes 16a to be colored in the same color are selected, and a voltage of 10 to 100 V is applied using the selected electrodes as anodes. After energizing for several minutes, pull up the board and thoroughly wash it with water. At this time, the polymers attached to the parts to which no voltage is applied are washed away, but the polymers 16a attached to the electrodes to which the voltage is applied are insoluble in water, so they are not washed away by water washing.
After washing with water and drying, a polymer layer 16a is formed on the selected electrode. Next, the polymer layer 1
In the step of dyeing 6a, the dye used can be dyed with a cationic dye because the electrodeposited polymer has a carboxyl group which is an acidic group. Good results can also be obtained with disperse dyes for polyester resins. Specifically, acetic acid was added to a cationic dye (Diacryl manufactured by Mitsubishi Kasei) with the desired color.
An aqueous solution with a pH of 3 to 5 is prepared, and the substrate that has undergone the electrodeposition process is immersed in the solution and boiled until the desired coloring density is achieved.
After cooling and washing with water, the polymer 16a on the selected electrode
is stained, and the remaining unattached portions of the polymer are not stained. Next, the melamine resin contained in the polymer and the carboxyl groups remaining in the polymer are subjected to a condensation reaction by baking to obtain resist dyeing treatment. The polymer layer that has been resist dyed will not be dyed again, so when forming colored layers for the second time onwards, select electrodes that will have the same color and repeat the steps of electrodeposition, dyeing, and resist dyeing. This is achieved through repetition. In this embodiment, the next step is to select an electrode for forming the polymer layer 16b.

In this manner, the polymer layer 16 serving as the background is formed on the first substrate 9 and faces the second substrate 10 with the spacer 17 in between. Despite such a simple method, there is an effect that the display section and the background section do not appear to be separated from each other, and there is no misalignment between the display section and the background section.

(Example 2) FIG. 4 is a front view of a panel in which the background board and parting board of a clock game are formed from electrodeposited polymer layers. The electrodeposition bath in Example 1 was an aqueous solution of acrylic-melamine resin paint (Powermite 3000-10 manufactured by Nippon Paint) with a resin solid content of 8% by weight, and the background and parting were applied on the substrate in the same manner as in Example 1. A board was formed. With this method, the display section, background section, and parting board are on the same plane, so there is no visual discomfort. Additionally, since there is no need for the colored metal plates and protective glass that were conventionally used as parting plates, the panel can be made thinner, and the process can be less labor-intensive.

(Example 3) In the same manner as in Example 1, a background portion is formed of an electrodeposited polymer layer on a first substrate, and a cell is constructed as shown in FIG. 3. The cell is filled with TN-FEM liquid crystal as the display material 14, the cell is sandwiched between a polarizer and an analyzer whose transmission axes are perpendicular to each other, and when viewed from the direction of the first substrate 9, the background portion 16 is colored. It looks like. Further, when a voltage is applied between the electrode 15 on which the polymer layer is electrodeposited and the counter electrode 13, the background portion 16 becomes black. In this way, the color of the background part can also be changed by turning the voltage ON and OFF in the same way as the display part. According to this method, it was possible to easily change the color of the background portion, which could not be done by conventional printing, without causing any color shift.

In addition, in this example, after electrodepositing the polymer layer on the substrate,
Although dyeing was carried out, the same effect as in this example was obtained even if the dye was dissolved in the electrodeposition bath in advance and the polymer layer was electrodeposited.

As described above in detail in the examples, the method for manufacturing the background pattern of a display device according to the present invention is to produce fine, multicolored patterns in predetermined positions with high precision by electrodepositing them on a substrate. You can place designs,
Also, since it is on the same surface as the display section, there is no visual discomfort. Furthermore, the color of the background portion can also be changed by applying a voltage between it and the counter electrode in the same manner as the display portion. Furthermore, when used as a parting board, in addition to the above effects, the panel can be made thinner, and the process requires less effort.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional display device with a background, FIGS. 2 and 3 are a front view and a sectional view of an embodiment of the present invention, and FIG. 4 is a front view of a second embodiment. 1, 9...first substrate, 2,10...second substrate,
3, 11... polarizing plate, 4, 12... display electrode,
5, 13... counter electrode, 6, 14... display material,
7...Printed part, 8, 17...Spacer, 15...
... Electrodeposition electrode, 16, 18, 19 ... Electrodeposition polymer layer.

Claims (1)

[Claims for Utility Model Registration] In a display device in which a first substrate and a second substrate, each having an electrode, are opposed to each other at a constant interval with a spacer interposed therebetween, one of the substrates is provided with the electrode and colored by electrodeposition. A display device characterized in that a background pattern of a display portion is formed of a polymer layer.