JPH083563B2 - Method for manufacturing multicolor display device - Google Patents

Description

The present invention relates to a method for manufacturing a multicolor display device to which a color filter is applied, and more particularly to a method for manufacturing a color filter with a light-shielding film for improving display quality.

〔The invention's effect〕

In order to eliminate the drawback that precise patterning is required when forming a light-shielding film in each color gap of a color filter, the present invention forms a dyeable material on a substrate in advance, and then forms a color filter on it. As a dye-proof mask to prevent the color filters from being dyed in sequence, only the dyeable layer exposed in the color filter gaps is colored to form a light-shielding film, resulting in a great effect with a simple method. To give.

[Conventional technology]

FIG. 4 shows a sectional view of an example of a conventional multicolor display device.
41 is a transparent substrate made of glass or the like, 42 is a transparent electrode made of ITO or the like formed on the transparent substrate, and 43, 43 ′, 43 ″ are color filters formed by matching the pattern with the transparent electrodes, and have different color tones. Reference numeral 44 denotes a second transparent substrate, which forms a second transparent electrode 45, is opposed to the transparent substrate 41, and holds the liquid crystal 36 in the gap to form a multicolor display device.

When this multicolor display device is sandwiched between a polarizer and an analyzer and a voltage is selectively applied to the liquid crystal through a transparent electrode, a portion that transmits light through a color filter and a portion that does not transmit light at all appear, resulting in a color display. It will be possible. In such a multicolor display device, it is necessary to suppress stray light leaking from the gap between the transparent electrodes as much as possible in order to maintain the color purity. However, when the polarizer and analyzer are arranged so that they become black when no voltage is applied, the liquid crystal layer thickness differs between the electrode part where the color filter is present and the gap part by the thickness of the color filter, so If it is attempted to sufficiently shield the filter portion, stray light will be generated in the gap portion due to light interference due to the deviation of the liquid crystal layer thickness. Furthermore, when a display mode in which transmission is performed when no voltage is applied is selected, the gap is always displayed in white, and color purity cannot be obtained.

[Problems to be solved by the invention]

As described above, in order to obtain the ideal color purity, it is desirable to dispose the light-shielding substance in the gap between the color filters. However, it is difficult to form a light-shielding layer only in the gaps between very fine color filters,
Patterning must be performed using a fine photomask or the like, but this will significantly complicate the process.

[Means for solving problems]

The present invention forms a color filter on a layer made of a dyeable material and does not stain the color filter, even if no fine processing means such as a special photomask is used to form a light-shielding film in the color filter gap. It is used as a mask to color the dyeable layer exposed in the gaps between the color filters to easily form a light-shielding film.

Specifically, (i) a step of forming a layer made of a dyeable material on the substrate.

(Ii) A step of sequentially forming a color filter in an arbitrary shape on the formed layer made of a dyeable material.

(Iii) A step of coloring the layer of the dyeable material exposed in the color filter gap with a dye.

By using the color filter as a dye-proof layer for the layer made of the dyeable material in the step having a step, it becomes a very simple step, and an extra photomask for patterning the light-shielding substance becomes inconvenient. Is.

[Action]

In the present invention, a color filter is used as the dye-proof layer, and as a method for forming the color filter, a printing method, a dyeing method, an electrodeposition method, etc. have been proposed so far, and any of them can be used in the present invention. The description is given below.

The printing method is a method in which an ink in which a dye is mixed with a binder is transferred to a fine pattern by means of offset printing or the like, but it can be easily applied to the present invention by appropriately selecting the type of binder. For example, if a water-soluble dye is used to color the underlying layer made of dyeable material, a binder having a hydrophobic and dense structure, for example, a resin such as polyester, can be selected to provide a light-shielding film later. It is possible to avoid that the color filter layer is also dyed at the same time as in the above dyeing.

In the dyeing method, easily dyeable resin such as gelatin is finely patterned by photolinography and sequentially dyed to form a color filter. Originally, the easily dyeable resin was used as a substrate for the color filter. Therefore, it is necessary to devise a color filter as a dye-proof layer. For example, if the color filter is dyed with an acid dye, a material that does not dye the underlying dyeable layer with a basic dye but a basic dye, such as an acrylic resin whose surface is easily negatively charged, is used. It is necessary to construct it, and of course, the dyeing for forming the light-shielding film later will be performed with a basic dye. Further, the color filter also needs to be subjected to a dye-proof treatment so as not to be dyed with a basic dye.

The electrodeposition method is disclosed in detail in JP-A-59-114572, and a color filter is formed by electrochemically depositing a polymer and a resin on an electrode. According to this method, if the deposited color filter is sufficiently cured, it becomes a layer that is no longer dyed, so that it can be easily applied to the present invention. However, an electrode is required for electrodeposition, so an electrode is formed on a layer made of a dyeable material, and a color filter is formed by electrodeposition.
Alternatively, either a method of forming a layer made of a porous dyeable material on a pre-patterned electrode and electrodepositing the electrode so that the electrode is not in an insulating state is employed.

If the above points are noted, the layer made of a dyeable material for forming the light-shielding film may be any of metal, oxide, resin and the like.

〔Example〕

Hereinafter, the present invention will be described more specifically based on Examples.

[Embodiment 1] FIG. 1 is a sectional view showing an example of a multicolor display device according to the present invention. Reference numeral 1 is a substrate made of glass, on which a transparent electrode 2 is patterned and formed in an arbitrary shape. On top of that, a layer 3 of dyeable material and a color filter 4,
4 ', 4 "are formed. Next, the exposed layer of dyeable material is dyed to form a light-shielding film 3'.

The forming method thus far will be described in more detail with reference to the process chart of FIG. As shown in FIG. 2 (a), the glass substrate 1
ITO is attached to the substrate by vapor deposition, and patterning is performed using photolinography to form the transparent electrode 2. Next, as shown in FIG. 2 (b), aluminum is formed on the entire surface of the substrate 1 by sputtering, and anodization is performed by passing current between the counter electrodes in a sulfuric acid aqueous solution to form a layer 3 made of porous alumite. As shown in FIG. 2 (c), since porous alumite is porous, it does not electrically insulate the transparent electrode 2 from the outside. Then, the color filters 4, 4 ', 4 "can be formed by the following method.

Change the pigment of the electrodeposition bath of the following composition to red, green, blue, I made 3 types. First, connect the transparent electrodes that you want to form a red filter, immerse each in a red electrodeposition bath, and apply a voltage between the counter electrode and the red electrode on the porous alumite corresponding to the voltage-applied electrode. It was electrodeposited with a filter. This substrate was pulled up, washed with water, heat-cured, and then the same operation was repeated for green and blue electrodeposition baths to produce color filters 4, 4 ', 4 ".

Next, as shown in FIG. 2 (d), the substrate on which the color filter is formed is dipped in a black acid dye solution to dye the exposed porous alumite, and then a sealing treatment is performed by sealing.
Was formed. At this time, the color filter was not dyed at all because it had no affinity for the acid dye.

In this way, the light-shielding film 3'and the color filters 4,4 ', 4 "
As shown in FIG. 1, the substrate 1 on which the film is formed is opposed to the second substrate 6 on which the second transparent electrode 5 is formed, and the liquid crystal 7 is placed in the gap.
A multi-color display device was produced by sandwiching.

The multicolor display layer device manufactured as described above has high accuracy with no misalignment between the color filter and the light-shielding film, even though it was manufactured by a simple method. It was extremely high with no stray light and no deterioration in color purity.

[Embodiment 2] FIG. 3 shows another example of the multicolor display device of the present invention. 31
Is a glass substrate on which a layer 32 of dyeable material is formed, which is formed by applying an aqueous gelatin solution by a spin code and curing it. Next, ITO is formed by sputtering and patterned by photolinography, and the transparent electrode 33 is laminated. The color filters 34, 34 ', 34 "were prepared by electrodeposition in the same manner as in Example 1, and thereafter, the exposed layer of the dyeable material made of gelatin was dyed in a black acidic solution to block light. A film 32 ″ was formed. At this time, the color filter was not dyed at all because it had no affinity for the acid dye.

In this way, the light-shielding film 32 'and the color filters 34,3
A multi-color display device was produced by placing a substrate 31 having 4 ″ and 34 ″ formed thereon and a second substrate 36 having a second transparent electrode 35 arranged opposite to each other and holding a liquid crystal 37 in the gap. The same effect as that of No. 1 was obtained.

[Example 3] The color filters 4, 4 ', 4 "in Example 1 were prepared by changing the pigment of the ink having the following composition to red, green and blue and repeating offset printing three times for each color.

Hereinafter, when a multicolor display device was manufactured in the same manner as in Example 1, the same effect as in Example 1 was obtained.

〔The invention's effect〕

As described above in detail, according to the present invention as specifically shown in the examples, since the light-shielding film can be formed by self-alignment only in the gaps having a fine shape using the color filter itself as a mask, the method is very simple. Regardless, there is no positional deviation between the color filter and the light shielding film, and a great effect can be obtained.

Further, the multicolor display device according to the present invention is capable of achieving high display quality and practical value because it can prevent light leakage from the color filter gap without complicating the process. The limitation for carrying out the present invention is only that the color filter has a dye-proofing effect, and there are no other limitations.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a multicolor display device according to the present invention. 2 (a) to 2 (d) are process diagrams showing an embodiment of a method for manufacturing a multicolor display device according to the present invention. FIG. 3 is a sectional view showing another embodiment of the multicolor display device according to the present invention. FIG. 4 is a sectional view showing an example of a conventional multicolor display device. 1,6,31,36,41,44 …… Substrate 2,5,33,35,42,45 …… Transparent electrode 3 ′, 32 ′ …… Light-shielding film 4,4 ′, 4 ″, 34,34 ′ , 34 ″, 43,43 ′, 43 ″ …… Color filter 7,37,46 …… LCD

Claims (8)

[Claims] 1. A method of manufacturing a multi-touch display device having a color filter, comprising the step of: (i) forming a layer made of a dyeable material on a substrate. (Ii) A step of sequentially forming a color filter in an arbitrary shape on the layer made of the dyeable material. (Iii) A step of coloring a layer made of a dyeable material exposed in the color filter gap with a dye. And a method for manufacturing a multicolor display device. 2. The method for manufacturing a multicolor display device according to claim 1, wherein the layer made of a dyeable material is made of a porous material. 3. The method for manufacturing a multicolor display device according to claim 2, wherein the porous substance is a porous oxide layer formed by anodizing a metal. 4. The method for manufacturing a multicolor display device according to claim 3, wherein the metal is aluminum and the porous oxide layer is alumite. 5. The color filter is formed by forming a transparent conductive film patterned in an arbitrary shape between the substrate and the porous material, and using the transparent conductive film as an electrode, and an electrodeposition polymer. The method for manufacturing a multicolor display device according to claim 2, wherein the porous material is sequentially formed from a solution containing a dye by electrodeposition. 6. The color filter is formed by forming a transparent conductive film patterned in an arbitrary shape on a layer made of the dyeable material, and using the transparent conductive film as an electrode to improve electrodeposition property. The method of manufacturing a multicolor display device according to claim 1, wherein the solution is sequentially formed on the transparent electrode by electrodeposition from a solution containing molecules and dyes. 7. The multicolor display device according to claim 1, wherein the step of coloring the layer made of a dyeable material with a dye is performed by dyeing from a black dye solution. Manufacturing method. 8. The method of manufacturing a multicolor display device according to claim 1, wherein the multicolor display device is a multicolor liquid crystal display device.