JPH0273306A - Color filter and production thereof - Google Patents

Abstract

PURPOSE:To allow the selective formation of plural colored layers on patterned transparent conductive films by forming colored layers on the patterned 2nd transparent conductive films which are provided on the 1st transparent conductive film and have the resistance value of <=1/5 the resistance value of this film. CONSTITUTION:An SnO2 film 2 as the 1st transparent conductive film is formed by a vapor deposition method on a transparent substrate 1 and the patterned 2nd transparent conductive films 3 are formed by a mask vapor deposition method on the SnO2 film 2. Only the transparent conductive films 3 to be formed with red layers are used as one electrode and the prescribed transparent conductive films 3 are colored red by an electrodeposition painting method, by which the red layers 5 are formed. Black light shielding films 9 are formed on the SnO2 film 2 between the 2nd transparent conductive films 3. The plural colored layers are selectively formed on the patterned transparent conductive films in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in color filters and methods for manufacturing the same.

[Prior Art] Conventionally, a colored layer for color separation has been formed on a transparent conductive film pattern on a transparent substrate by an electrodeposition coating method using electrophoresis (Japanese Unexamined Patent Publication No. 82-180421). Publication No.). This technique will be explained below.

That is, when forming a functional coating film between fine conductive circuit patterns, first, a precoat coating film having light-shielding properties and drug solubility is formed only on the conductive circuit patterns by electrodeposition coating. Next, the entire transparent substrate is coated with a functional material capable of forming a photocurable functional coating film, including the precoated coating film, by an appropriate method. Subsequently, after prebaking this film using an appropriate method and conditions as the case requires, light is irradiated from the back side of the transparent substrate, that is, the side of the substrate that does not have a conductive circuit pattern, to harden the photocurable material. At this time, the light-blocking properties of the areas on which the pre-coated film is formed by electrodeposition block light, and the photocurable material coated thereon does not harden.

That is, photocuring of the photocurable material progresses only in the gaps between the conductive circuit patterns where no precoat film is formed by electrodeposition. Thereafter, by using an appropriate agent to elute the light-shielding precoat film coated by non-curing and electrodeposition of the above-mentioned non-curing material, a functional property that develops photo-curing properties only in the gaps between the conductive circuit patterns is created. The material (light shielding film) remains.

[Problems to be Solved by the Invention] However, the prior art has the following problems.

In other words, the light-shielding film (black) uses metal chromium or carbon, so it has high conductivity, and if the light-shielding film is interposed between the patterned transparent conductive films, a short circuit will occur between the transparent conductive films, and the electrodeposition coating will fail. Depending on the method, it is not possible to form a predetermined blue layer on each transparent conductive film.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a color filter in which a plurality of colored layers can be selectively formed on a patterned transparent conductive film, and a method for manufacturing the same.

[Means for Solving the Problems] The first invention of the present application includes a transparent substrate, a first transparent conductive film provided on the transparent substrate, and a transparent conductive film provided on the first transparent conductive film. A patterned second transparent conductive film having a resistance value of 175 or less compared to the film, a blue layer provided on the second transparent conductive film, and the first transparent conductive film between the second transparent conductive film. The color filter is characterized by comprising a light shielding film provided on a conductive film.

The second invention of the present application provides a first transparent 'H1:
::”The resistance value is 15 compared to the transparent conductive film through N.
The following steps include forming a second transparent conductive film and patterning it; forming a colored layer on the patterned second transparent conductive film; and forming the first transparent conductive film between the second transparent conductive films. forming a light shielding film on the transparent conductive film of the present invention.

As the first transparent conductive film according to the present invention, a film whose sheet resistance value is 5 times or more larger than that of the second transparent conductive film is used,
Specifically, a Sn 02 film etc. can be mentioned. This Sn 0
The sheet resistance value of the two films is 150 to 500Ω.

Further, as the second transparent conductive film according to the present invention, for example, 9
Examples include 5% In 03 - 5% Sn 02 (I To), and the sheet resistance value of this ITO is 10 to 30 Ω. The sheet resistance value of this transparent conductive film is set to be 115 or less compared to that of the light shielding film, and if it exceeds 115, it becomes difficult to selectively form each colored layer on the patterned transparent conductive film.

[Function] In the present invention, a first transparent conductive film having a resistance value five times or more higher than that of the second transparent conductive film is used as a lower layer of a patterned second transparent conductive film. As a result, a colored layer of a predetermined color can be easily and selectively formed on the second transparent conductive film by an electrodeposition coating method without causing a short circuit between patterned transparent conductive films as in the conventional method. can.

[Example] Hereinafter, a method for manufacturing a color filter according to an example of the present invention will be described in order of steps with reference to FIGS. 1(A) to (E) and FIG. 2.

(1) First, a transparent group! ! A 5n02 film 2 as a first transparent conductive film was formed on the i21 by vapor deposition using a reactive sputtering method. Here, the thickness of the Sn 02 film 2 was, for example, 0.1p, and the sheet resistance value was 500Ω.

Next, a patterned second transparent conductive film 3 was formed on the 5n02 layer 2 by a mask evaporation method (as shown in FIG. 1(A)). Here, the width of the transparent conductive film 3 is 100
IDn, the spacing was 10p, and the sheet resistance value was 15Ω. Subsequently, as shown in FIG. 2, a connection layer (-dotted chain line) 4 made of, for example, a conductive paste is provided on the second transparent conductive film 3 on which the red layer is to be formed, and the transparent conductive film 3 on which the red layer is to be formed. A predetermined transparent I4t film 3 was colored red by electrodeposition coating method using only one electrode as one electrode, and was heated at 170°C for 1
A red layer 5 was formed by performing a heat curing treatment for a period of time (as shown in FIG. 1(B)). In addition, the applied voltage for main painting at this time was 8
．． It was set to 0V. Further, the surface of the film 3 is in an insulating state through the second transparent groove on which the heat-cured red layer 5 is placed.

(2) Next, a connection layer (two-dot chain line) 6 made of conductive paste is provided on the second transparent conductive film 3 in which a green layer is to be formed, as in the case of the red layer 5, and a green layer is to be formed. Using only the second transparent conductive film 3 as one electrode, a predetermined transparency percentage is colored green on the film 3 using the Honshin coating method, and a green layer 7 is formed by heat curing treatment for 17 [1° C.] hours. (Figure 1 (
C) As shown).

Note that the voltage at this time was 6.5V. Subsequently, a connection layer (not shown) made of conductive paste is provided on the second transparent conductive film 3 on which the blue layer is to be formed, as in the case of the red layer 5, and the second transparent conductive film 3 on which the blue layer is to be formed is provided with a connecting layer (not shown). The blue layer 8 was formed on a predetermined second transparent conductive film 3 by subjecting it to a heat curing treatment for a period of time in the same manner as above (as shown in FIG. 1(D)).

Note that the applied voltage for electrodeposition coating at this time was 9.0 .

Next, the 5n02 film 2 is attached with an ゛f polarity, for example, 3
After electrodeposition at 5V, heat treatment was performed at 170° C. for 30 minutes to form a black light-shielding film 9 on the 5n02 film 2 between the second transparent conductive films 3 to produce a color filter (first Figure (E) (Illustrated). Here, when the light shielding film 9 was measured by spectroscopy, the absorbance was 1.92. The length of each colored layer becomes shorter in the order of the red layer 5, the green layer 7, and the blue layer 8, and the connecting layer 4.6 is formed by forming the colored layer by an electrodeposition coating method, and then, for example, It may be removed with methyl ethyl ketone.

According to the method of the present invention, after forming the Sn02 film 2 having a large resistance value on the transparent substrate 1, the Sn02 film 2 is
forming the second transparent conductive film 3 having a smaller resistance value than that of the second transparent conductive film 3;
Furthermore, a red layer 5 is formed on this transparent conductive film 3. In order to form colored layers such as the blue layer 7 and the green layer 8, the red layer 5. The blue layer 7 and the green layer 8 can be selectively formed between the second transparent conductive films 3, respectively. In addition, 5n02
Although it is possible that the red layer 5, green layer 7, and blue layer 8 may adhere to some extent on the film 2, the overall hue on the film island on the Sn○2 film 4 is close to black, and it is not enough to cause a problem. isn't it. Further, each of the red layer 5, green layer 7, and blue layer 8 can be made by the electric coating method, which is easy to manufacture, and costs can be reduced.

The color filter according to the present invention, as shown in FIG.
A second transparent conductive film 3 having a smaller sheet resistance value (15Ω) than that of the S n O2 film 2 is provided on top, and this second
It has a structure in which colored layers such as a red layer 5, a green layer 7, a blue layer 8, etc. are selectively provided on a transparent conductive film 3. Therefore,
As mentioned above, during electrodeposition coating, the red layer 5. This has the effect that the blue layer 7 and the green layer 8 can be reliably formed on the second transparent conductive film 3, respectively.

In addition, in the above-mentioned example, the case where only the colored layers of the red layer, the green layer, and the blue layer are formed on the transparent conductive film is described, but the present invention is not limited to this, and colored layers of other colors may be formed. .

[Effects of the Invention] As described in detail above, the present invention provides a color filter useful for liquid crystal display devices that can selectively form a plurality of colored layers on a patterned transparent conductive film and can reduce costs. and a manufacturing method thereof.

[Brief explanation of the drawing]

FIGS. 1A to 1E are cross-sectional views showing a method for manufacturing a color filter according to an embodiment of the present invention in order of steps, and FIG. 2 is a plan view for explaining a method for forming a colored layer. DESCRIPTION OF SYMBOLS 1... Transparent substrate, 2... 5n02 film (first transparent conductive film), 3... Second transparent conductive film, 5... Red layer, 7... Green layer, 8 ... Blue layer, 9... Light-shielding film. Applicant's agent Patent attorney Takehiko Suzue

Claims (2)

[Claims] (1) A transparent substrate, a first transparent conductive film provided on the transparent substrate, and a patterned film provided on the first transparent conductive film having a resistance value of 1/5 or less compared to the transparent conductive film. a second transparent conductive film, a colored layer provided on the second transparent conductive film, and a light shielding film provided on the first transparent conductive film between the second transparent conductive films. A color filter comprising: (2) A step of forming a second transparent conductive film having a resistance value of 1/5 or less compared to that of the transparent conductive film on the insulating substrate via the first transparent conductive film, and then patterning the second transparent conductive film; forming a colored layer on the second transparent conductive film; and forming a light shielding film on the first transparent conductive film between the second transparent conductive films. Color filter manufacturing method.