JPH04109201A - Method and device for producing multicolor surface colored body - Google Patents

Abstract

PURPOSE:To suppress initial electrodeposition current and to provide a colored layer having a uniform film thickness by impressing a voltage via an electric resistance to electrodes, thereby forming the colored layer. CONSTITUTION:The electrodes 12 consisting of ITO are patterned and formed in the form of stripes at 200mu width on a substrate 11 consisting of glass. This substrate is immersed in an electrodeposition soln. and the electrodes to form the same color are connected. These electrodes are connected via the electric resistance 14 to a power source 15 and the voltage is impressed between the electrode and a counter electrode 16. The value R of the electric resistance 14 of this time is so determined as to satisfy the relation RL<R<RS between the resistance RL of the produced electrodeposition soln. and the resistance RS of the colored layer. The current concn. to the ends of the electrodes is suppressed in this way and the uniform film is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a method for manufacturing a multicolor surface-colored body used as a color filter for a multicolor liquid crystal display device, etc., and specifically relates to a method for producing a multicolor surface-colored body produced by electrodeposition. Relating to a manufacturing method.

[Summary of the Invention] The present invention applies voltage to the electrode on the substrate to form a colored layer by 1i@ on the electrode, and by applying the voltage to the electrode via electrical resistance, the initial voltage is reduced. A colored layer with a uniform thickness can be obtained by suppressing the deposition current.

[Prior Art] FIG. 2 shows a cross-sectional view of a conventional multicolored surface-colored body. 21 is a substrate made of glass or the like, and 22 is an electrode made of ITO or the like, and a large number of electrodes are formed on the substrate 21 by patterning into an arbitrary shape. 23 is a colored layer consisting of a polymer and a dye and is formed by electrodeposition. Figure 3 shows 'r! A diagram of the i-wearing process is shown. A substrate 31 is coated with an electrolytic solution 32 consisting of a polymer and a dye.
The electrodes 33 that you want to make the same color are immersed in the same color and connected to the power source 34.
A voltage is applied between the counter electrode 35 and the counter electrode 35. Then, a colored layer 36 is formed on the electrode to which voltage is applied.

A different colored layer is formed on the other electrode, and in this case, the colored layer is similarly formed using a different electrodeposition coloring solution. 1
The formation of a colored layer by coating is a highly accurate and simple method for forming multicolored fine patterns such as color filters for multicolor liquid crystal display devices, and is therefore very suitable. As mentioned above, the method for manufacturing a multicolored surface-colored object using 1IT is extremely useful, but as the electrode to be electrodeposited becomes finer, the thickness of the colored layer at the center and end portions of the electrode becomes smaller. is the second
As shown in the figure, there is a tendency for the film to become thicker at the edges where the current tends to concentrate during electrodeposition. Such non-uniformity in film thickness results in uneven color. Furthermore, when applying it to color filters for multicolor liquid crystal display devices, liquid crystal display devices require a smooth surface in order to control the liquid crystal layer thickness, and such color filters! Undesirable.

FIG. 4 shows a current-time curve in conventional electrodeposition. As the voltage is applied, the current reaches a peak ip and then decreases, reaching a current of 18 when the voltage is turned off.

This current change can be considered as follows. initial current ip
Since nothing has been deposited on the electrode yet, it flows according to the electrical resistance of the electrodeposition solution that exists between it and the counter electrode. In other words, if the applied voltage is ■, the electrical resistance R of the electrodeposition solution is
L is expressed as RL = V/I P . The current at this time determines the electrodeposition speed, so if a large current is concentrated at the electrode end, it will result in non-uniformity in film thickness as shown in FIG.

[Means to solve the problem]

Therefore, in the present invention, the purpose of the present invention is to obtain a colored layer with a smooth surface and a uniform thickness by applying a voltage to the electrode through an electrical resistance during electrodeposition, thereby increasing the current to the electrode end. This was discovered to reduce concentration and create more uniform ribs.

[Function] As shown in the equivalent circuit shown in FIG. 5, if a voltage is applied through a resistor R larger than RL, the current flowing initially can be suppressed. Returning to FIG. 4 and continuing the explanation, the decrease after the peak current is caused by an increase in electrical resistance due to the colored layer deposited on the electrode. Eventually, the electrical resistance R3 of the colored layer becomes much larger than the electrical resistance of the electrodeposition solution, so the current 111 when the voltage is turned off has the relationship Rs = V/1*. Consider the case where a voltage is applied via a resistor R in the equivalent circuit of FIG. The electrodeposition resistance, which was initially R1, will increase to Rs, but if R is larger than R3, most of the applied voltage will be applied to R no matter how long it takes, and 1i will not progress. It's going to happen. However, R
If R is made larger than RL and smaller than R8, the initial current is suppressed, but the voltage drop due to R gradually becomes smaller and ml gradually increases. That is, if 1i is deposited through a resistor having a value of R such that RL<R<Rs, a colored layer can be grown while suppressing the initial non-uniform current.

[Example 1] Hereinafter, the effects of the present invention will be specifically explained using Examples and Comparative Examples.

(Example) FIG. 1 shows a method for manufacturing a multicolored surface-colored body according to the present invention. Reference numeral 11 denotes a substrate made of glass, and electrodes 12 made of ITO are formed on the substrate by patterning in stripes having a width of 200 u. This board'r! i Connect the electrodes immersed in the beaching liquid 13 and make them the same color, and connect them to the power source 1 through the electric resistance 14.
5, and a voltage was applied between it and the counter electrode 16. The flowing current is measured by an ammeter 18. At this time, the value R of the electric resistance 14 is 2Ω, and the current − shown in FIG.
The resistance RL of the electrodeposition solution produced from the time curve is 400Ω,
The resistance R9 of the colored layer is IOKΩ, and RL<R<RI
It satisfied the relationship I. Colored layer 1 formed in this way
7 has a film thickness difference of 1 between the edges and the center! It was very uniform with a thickness of 0.1 μm or less compared to 5 μm.

(Comparative Example) When a voltage was directly applied to the electrodes except for the electrical resistance 14 in FIG. 1, the difference in film thickness between the end portion and the center portion was 0.51 for a film thickness of 15 μm. tm, resulting in an uneven colored layer with thick edges.

[Effects of the Invention] As specifically explained above in the Examples and Comparative Examples, the method of forming a colored layer according to the present invention, in which voltage is applied via electrical resistance during electrodeposition, is a simple method; The effect is great, and it realizes a multicolored surface colored body with a very uniform film thickness and a smooth surface. Further, the color filter for a multicolor liquid crystal display device to which the present invention is applied can guarantee uniform liquid crystal layer thickness and, by extension, excellent display quality by a simple method due to its uniformity and smoothness.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a method for producing a multicolored surface-colored body according to the present invention. FIG. 2 is a cross-sectional view of a conventional multicolor surface-colored body. The third section is a diagram showing a conventional method for manufacturing a multicolor surface colored body. Figure 4 is a current-time curve during electrodeposition. FIG. 5 is an equivalent circuit showing the effect of the present invention. 11.21.31... Substrate 12.22.33... Electrode 13.32... Electrodeposition solution 14... Electric resistance R 15,34... Power supply 16.35... Counter electrode 17.23.36... Colored layer and above Applicant: Seiko Electronic Industries Co., Ltd. Representative Patent attorney: Takayuki Hayashi Cross-sectional drawing of conventional multicolored surface colored body 2 Diagram Invention 1 This is the first method for manufacturing a surface-colored body with one color.
Figure 4 Diagram 3 showing the method of displaying the winter colors of the winter season.
figure

Claims (2)

[Claims] (1) In a method for manufacturing a multicolored surface-colored body in which a colored layer is formed on the electrodes by electrodeposition from an electrodeposition solution by applying a voltage to a plurality of electrodes on a substrate, the voltage is applied to the electrodes. A method for producing a multicolored surface-colored body, characterized in that a colored layer is formed by applying voltage to an electrode via a resistor. (2) Claim 1 characterized in that the resistance value of the electrical resistance is set to be greater than the electrical resistance of the electrodeposition solution and smaller than the electrical resistance of the electrodeposited colored layer.
The method for producing the multicolored surface colored body described above.