JPS59114571A - Manufacture of multicolor display - 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 method for manufacturing a multicolor display device using color filters.

FIG. 1 shows an example of a multicolor display device using color filters. 1 is a transparent substrate, 2 is a transparent electrode patterned with arbitrary figures or characters, 3 is a color filter, 4
5 is a second transparent electrode, and 5 is a counter substrate. In the display cell configured in this way, the transparent substrate 1 and the counter substrate 5
A display material that can serve as a shutter, such as a liquid crystal or an electrochromic substance, is sandwiched and held between them, and when viewed from the direction of the transparent substrate 1, the color of the color filter 3 is displayed when the shutter is fully open. 4. On the other hand, when the shutter is closed, the color of the color filter 3 is obscured and cannot be seen. Therefore, for the color filter, for example, in a1, 5a is red, 3b is green, 5
By selecting three primary colors such as c as the background color and patterning these three primary colors in a periodic manner, it is possible to display multiple colors in the same cell. Specifically, for example, to display red, only the original shutter of red pattern 3a should be in the 1" open state, and the other original shutters on 5b and 5c should be in the 1" closed state. In order to display the next yellow color, the original shutters on red and green patterns 5a and 3b should be in the 1" open state, and the original shunter on the remaining pattern 5C should be in the 1" closed state. . In the latter case, 1 in the additive color mixture looks yellow. If the color filter 3 has appropriate light transmittance and the counter substrate 5 is transparent, a light emitting display material is sandwiched and held between the transparent substrate 1 and the counter substrate 5 and viewed from the direction of the counter substrate 5. By doing so, similar effects can be obtained.

As described above, multicolor display using color filters is a simple method, and its versatility and effects are great. However, when actually manufacturing a multicolor display device using such color filters, it is difficult to match the pattern of the transparent xi and the pattern of the color filter. It becomes difficult. As a method for producing a color filter, it is possible to use means such as Nuclean printing and photophosphorography. However, in the former case, there is a limit to the miniaturization of patterns, and the more colors are used, the worse the accuracy of printing position becomes, and color misregistration occurs. In the latter case, fine patterns are possible, but the process is extremely complicated as it requires a photolithography process each time a different color is used, and the advantage of color filters as a simple multicolor display method is lost. It's coming.

An object of the present invention is to eliminate the above-mentioned drawbacks associated with the production of color filters and to provide an inexpensive multicolor display device having a fine pattern. For this purpose, using Mg anodic oxidation technology, first create an A1 film over the entire surface of a transparent electrode (Sn02.■TO, etc.) by sputtering or vacuum evaporation, and then use this Mg and transparent electrode. For example, as shown in FIG. 2, dry etching or chemical etching is performed in the form of nutribe to create a pattern in which the YBGL stripes of the transparent electrode 2 are completely overlapped. Next, the transparent electrode 2 and the A1 film 14 patterned in this way are held for 1 second as desired to connect the electrodes, and are anodized in an anodizing bath, so that only the Al film connected to the electrodes becomes an aluminum oxide film. be able to. This aluminum oxide exhibits extremely high transparency to visible light and can be colored by various methods. Therefore, it is possible to color only the aluminum oxide film produced by selectively anodizing the Al film as described above, and leave the other portions that have not been anodized uncolored. In this way, by repeating the process of selectively anodizing and coloring the M film on the transparent electrode, there is no color shift caused by Q1 screen printing, and it is possible to go through complex processes such as photolithography. Therefore, multicolor color filters with fine patterns can be easily and inexpensively produced.

Hereinafter, the present invention will be explained in detail based on Examples.

1) First step A of manufacturing method of multicolor display device using liquid crystal
Preparation of g film A transparent electrode z (Sn
02. ■Al
A film is formed on the entire surface with a thickness of 1 to 2 μm.

Note that the M film may be formed by vacuum deposition.

2nd process: pattern etching As shown in Figure 2, the stripe width is 5L and 1 μm.

The M film and the conductive film are dry etched or chemically etched into a pattern with a stripe interval of 20 μm.

Fifth Step: Anodization As shown in FIG. 3, consider the case where stripes 3a are colored red, stripes 5b are colored green, and stripes 3C are colored blue.

First, if the first color you want to color among these five colors is, for example, red, select only the stripe 6a, connect the electrode to the transparent electrode and the M film, and in a 15 wt% sulfuric acid aqueous solution.
A PT plate with an area equal to or larger than the Al film of the anode is used as the cathode, and the temperature is +4.0 to +5 at room temperature. Anodic oxidation is performed at a constant voltage of Ov, and the Al film on the transparent electrode is made into a transparent aluminum oxide film. The time required for the M film to become transparent after anodic oxidation is approximately 30 to 60 minutes, depending on the thickness of the M film. In this way, only the stripe 5a becomes transparent, while the other stripes 5b and 3c remain as opaque Al films. In addition to the above-mentioned sulfuric acid bath, an anhydrous chromic acid bath, an oxalic acid bath, a phosphoric acid bath, etc. can be used as the anodizing bath.

4th step Coloring Next, the transparent glass substrate 6 on which only the M@ of the stripes 6a described above is selectively anodized is coated with a red oxidizing dye, A11z.
The transparent aluminum oxide film formed on the surface of the stripe 5a is colored red by immersing it in an acid bath of Arine Rubinol 5 G for several minutes. At this time, since ARK remains completely on the surface of stripes 5b and 6c without being oxidized, stripe 6b
and 5C are not colored in this step.

Fifth Step Sealing Treatment The anodized film of the stripes 5a colored red is sealed in steam. The anodic oxide film thus colored and sealed is then applied to the remaining stripes 5b in the subsequent process.
Even if the M film of , 3c is anodic diluted and then colored, the progress of decolorization is small, and there is no possibility that it will be dyed again with another color. Furthermore, it was found that this sealing treatment can improve the chemical resistance, heat resistance, and light resistance of the filter, and is also effective in increasing the reliability of display devices. Note that good results can also be obtained by using a method such as nickel acetate sealing or boiling water sealing as the sealing treatment.

6th step Color the stripe 3b green ・Next, repeat the same operations as in steps 5.4.5 to selectively anodize only the ARK of the stripe 5b to make it a transparent aluminum oxide film, and turn it green. Acid dye, Aluminum
It is colored green by immersing it in an acidic bath of Green GL W, and is then subjected to a sealing treatment.

7th step Coloring the stripe 5C blue Similar to the above step, repeat the same operations as in steps 3.4.5 to selectively anodize only the M@ of the 7 trig 5C to make a transparent quantized aluminum film. Blue acid dye, Aluminum
It is colored blue by immersing it in an acid bath of B'lue 'L L W, and then subjected to a sealing treatment. thus,
A striped color filter with five colors of red, green, and blue is completed. In addition, the above M4. 6. In addition to the above-mentioned acid dyes, various acid dyes can be used as dyes used in the coloring process (see Dye Handbook, Maruzen), and inorganic dyes can of course be used. In addition, oil-soluble dye, Sumiplast Tu
rquoiaeBlue 'E, Sumiplast
Good coloring was also achieved using Red P, B paste solution.

8th Step: Preparation of Alignment Film By obliquely depositing SiO, for example, on the three-color striped color filter of red, green, and blue produced through the above steps, and on the second transparent electrode 4, Fabricate a liquid crystal alignment film.

By holding a nematic liquid crystal 9 between a color filter with an alignment film and a second transparent electrode, a TN type liquid crystal display device that can easily display multiple colors or full colors can be created as shown in Figure 5. Complete. A feature of this liquid crystal display device is that the transparent electrodes 2 used when anodizing the AL films of the stripes 3a, 6b, and 5c are used as they are as drive electrodes of the liquid crystal display device.

Furthermore, stripe 5 of the completed color filter
It is also possible to form transparent electrodes again on top of a', ib, and 5'c, respectively, and use them as drive electrodes. In addition,
In addition to the above-mentioned TN type display, dichroic dyes are dissolved in liquid crystal to display G.
-H type display or nematic liquid crystal DS
You can also use M.

2) Manufacture 0 multicolor display devices using electrochromic, form an A1 film on the entire surface of the transparent electrode on the special white ceramic substrate 12 (see figure Ha) by nupata ring, and perform the following process. A striped color filter of three colors, red, green, and yellow, is produced by the same method as in the example. here,
When coloring the transparent heptaluminium oxide film obtained by anodic oxidation yellow, a yellow acid dye, 'Q, uinolin,
e Yellow F! An acidic bath was used. For coloring red and green, the same acidic dye bath as in the example was used. Between the counter substrate 5 provided with this color filter 5 and the transparent Galanus substrate 6 which has a WOs display electrode 10 having the same stripe pattern as the color filter 3 on the transparent electrode 2 and a WOs counter electrode 11 thereon, ,
Perchlorinated lithium propylene carbonate, solution (1
M) is electrolyzed 'If! i, 15 as scissors holding company,
An electrochromic display device capable of displaying multiple bar graphs as shown in FIG. 4 is completed.

As described above in Examples 1) and 2), by using the manufacturing method of the present invention, a multicolor color filter with a fine pattern without color shift can be produced without going through complicated processes. It can be produced extremely easily and inexpensively, and its effects are great. Furthermore, if the pore sealing treatment is performed, selective coloring of the anodic oxide film can be ensured.

[Brief explanation of drawings]

FIG. 1 shows a conventional example of a multicolor display device using color filters. FIG. 2 shows fcM@ and transparent electrodes patterned in stripes on a transparent glass substrate. Fifth
The figure shows a TN type liquid crystal display capable of displaying multiple colors to explain the manufacturing method of the present invention. FIG. 4 shows an electrochromic display device capable of displaying multicolor bar graphs for explaining another embodiment of the manufacturing method of the present invention. 1...Transparent substrate, 2...Transparent electrode, 5...Color filter, 4...Second transparent electrode, 5... Counter substrate, 6...Transparent glass substrate, 7...Polarizing plate, 8...Alignment film, 9...
・Liquid crystal layer, 10...WO3 display electrode, 11...
...WO'3 counter electrode, 12... White ceramic substrate, 15... Electrolyte layer, 14...
...A1 membrane. Applicant: Daini Seikosha Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a method for manufacturing a multicolor display device using a recolor filter, the color filter is placed on a transparent electrode in an A1 form.
1. A method for manufacturing a multicolor display device, characterized in that the multicolor display device is manufactured by selectively repeating the step of descending oxidation and coloring after forming and patterning a film. 2) The method for manufacturing a multicolor display device according to claim 1, wherein in manufacturing the color filter, a sealing treatment is performed after the coloring step.