JPH0561029A - Production of color liquid crystal display element - Google Patents

Abstract

PURPOSE:To improve the adhesive power of color filter films and a substrate and to suppress the peeling of the films so as to improve reliability by subjecting the residual films of the color filters generated on the substrate surface exclusive of the color filter regions to a partial polishing treatment. CONSTITUTION:The residual films 2 of the color filters generated on the surface of the substrate exclusive of the color filter regions are subjected to the partial polishing treatment in the process for production of the color liquid crystal display element constituted by applying a photosensitive base material 1 on the substrate surface and selectively providing the color filter regions by utilizing photolithography, then forming the film having the adhesive power to the substrate 3. The residual films 2 of the photosensitive base material generated in the positions exclusive of the color filter regions are partially polished, by which the residual films 2 interposed between the substrate 3 and the film having the adhesive power to this substrate 3 are partially removed. Then, the substrate 1 and the film having the adhesive power to the substrate 1 are in direct contact with each other in the parts where the residual films 2 are removed and, therefore, the adhesive power of the film having the adhesive power to the substrate 1 and the substrate 1 is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a color liquid crystal display device having a substrate provided with a color filter.

[0002]

2. Description of the Related Art Various systems have been proposed for color display using liquid crystals. For example, a GH (Guest Host) method in which a dichroic dye is mixed in a liquid crystal, an ECB (Electrically Controlled Birefri) in which the birefringence of the liquid crystal is used.
ngence) method, an optical shutter method in which a color filter and a liquid crystal display element are combined.

The optical shutter system is most widely used because it can be used for full-color display. With this optical shutter system, color filters of the three primary colors of red, green, and blue,
Full color display is performed by using the additive color mixing method by combining the control of the amount of transmitted light by the liquid crystal display element.

The color filter is usually formed by finely processing red, green, and blue colored layers corresponding to each pixel on the substrate into a mosaic shape or a stripe shape. The method for forming this color filter includes a dyeing method, an electrodeposition method, a vapor deposition method,
Among them, there are printing methods and the like. Among them, the dyeing method is most often used for full-color display because it has high processing accuracy for fine patterns and has a wide selection range of colors for dyeing.

A general method for producing a color filter by the above dyeing method is shown in FIG.
As shown in FIG. 3, a color filter region made of the photosensitive base material 22 is selectively formed on the glass substrate 21. That is, on the surface of the glass substrate 21, for example, gelatin,
Photosensitive substrate 2 made of acrylic or polyimide
2 is applied, the photosensitive substrate 22 is irradiated with ultraviolet rays or the like to expose a predetermined pattern, and then developed with a developing solution to form a predetermined fine pattern.

Next, the photosensitive substrate 22 is dyed with a dye. Then, the photolithography process and the dyeing process are repeated three times to form the red, green, and blue colored layers, and further, for example, acrylic and SiO.
₂ , a protective film 23 made of epoxy, urethane, or the like is formed to obtain a color filter.

Thereafter, a transparent electrode, an alignment film, etc., which are not shown, are provided, and an adhesive agent such as epoxy for bonding with another glass substrate (not shown) is provided on the peripheral portion of the glass substrate 21. The seal portion 24 is formed.
In FIG. 3, the protective film 23 is formed on the entire surface of the glass substrate 21, and the seal portion 24 is provided on the glass substrate 21 via the protective film 23. However, the periphery of the glass substrate on which the seal portion is provided is shown. A protective film is formed on the area other than
In some cases, the seal portion may be directly formed on the glass substrate.

[0008]

However, when the color filter region is selectively formed on the surface of the glass substrate 21, after the photosensitive substrate 22 is developed, the molecule is formed on the portion other than the color filter region to be removed. A residual film 25 may occur at the level. In this case, the protective film 2 of the color filter
3 will be interposed between the glass substrate 20 and the glass substrate 20, and depending on the type and properties of the residual film 25, the adhesive force between the protective film 23 and the glass substrate will decrease, and the protective film 23 will There is a problem in that reliability is deteriorated at a high temperature where peeling easily occurs and the adhesive force tends to decrease.

On the other hand, even when the seal portion is directly formed on the peripheral portion of the glass substrate, the residual film of the color filter is interposed between the glass substrate and the seal portion as in the case where the protective film is formed. As a result, the adhesive strength of the seal portion to the glass substrate is reduced.

[0010]

In order to solve the above-mentioned problems, a method for manufacturing a color liquid crystal display device according to the present invention comprises applying a photosensitive base material to the surface of a substrate and selectively photo-coloring using photolithography. In a method of manufacturing a color liquid crystal display element, which comprises forming a film having adhesive force with the substrate after providing a filter region, a portion of the residual film of the color filter generated on the substrate surface other than the color filter region is partially It is characterized by performing a polishing process.

[0011]

According to the above construction, by partially polishing the residual film of the photosensitive base material generated at the position other than the color filter region, the space between the substrate and the film having the adhesive force with the substrate is formed. The residual film intervening in is partially removed. Therefore, in the portion where the residual film is removed, the above-mentioned substrate and the film having the adhesive force with the substrate are in direct contact with each other. As a result, the adhesive force between the film having the adhesive force with the substrate and the substrate is improved, and the peeling of the film is suppressed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS. 1 and 2.

In the color liquid crystal display element of the present embodiment, color filters of three primary colors of red, green and blue are formed on a glass substrate in a mosaic shape or a stripe shape, respectively. The color filter is formed by photolithography using a photosensitive substrate made of gelatin, acrylic, polyimide, or the like. In the photolithography step, first, the surface of the glass substrate is coated with the above-mentioned photosensitive base material, and then prebaking is performed to volatilize the solvent component in the photosensitive base material.

Next, a mask plate is placed on the glass substrate to perform alignment, and then ultraviolet rays are radiated to expose a predetermined pattern for exposure. As a light source used for exposure, an ultra-high pressure mercury lamp having many peaks of spectral energy distribution in the ultraviolet region, a xenon lamp, a carbon arc lamp or the like is used. Then, the above-mentioned photosensitive base material is developed using a dedicated developer to form a fine pattern on the surface of the glass substrate. Then, the glass substrate on which the fine pattern is formed is further heat-treated, and the photosensitive substrate is dried and cured.

Subsequently, the patterned photosensitive substrate is dyed with a predetermined dye, and the photolithography process and the dyeing process are performed for each of the three primary colors of red, green, and blue to obtain the three primary colors. A filter is formed for each pixel of the liquid crystal display element.

By the above steps, as shown in FIG. 1A, when the color filter region selectively made of the photosensitive substrate 1 is formed on the surface of the glass substrate 3, the color filter region on the surface of the glass substrate 3 is formed. In the area other than the above, the photosensitive base material 1 is not sufficiently removed by the developer alone,
The residual film 2 of the photosensitive substrate 1 may occur at the molecular level.

Therefore, as shown in FIG. 1B, a buffed drill 4 (diameter of about 50 mm, width of about 10 mm, rotation speed of 60)
The residual film 2 is partially polished by using 0 rpm and a weight of 0.8 to 1.0 kg / cm ² ). This buffed drill 4 has a disc-shaped buff 6 attached to a hand drill 5. The buff 6 is rotated and brought into contact with a predetermined position of the residual film 2 to polish the residual film 2. To do.

At this time, over the entire surface of the residual film 2,
If this polishing process is performed, the display pixel film of the color filter may be damaged. Therefore, as shown in FIG. 1C, the polishing process of the residual film 2 is partially performed,
The residual film 2 is removed only in the portion 7 where the polishing process has been performed.
After the polishing, the glass substrate 3 is washed with pure water using an ultrasonic cleaner (not shown) to remove dust generated by the polishing process.

Next, as shown in FIG. 1D, a protective film 8 made of, for example, acrylic, SiO ₂ , epoxy, urethane or the like is formed on the glass substrate 3 in order to prevent scratches and elution of foreign matters from the color filter. Is formed so as to cover the entire surface of. Subsequently, a transparent electrode (not shown) is formed, and an alignment film (not shown) made of, for example, polyimide or the like for orienting the liquid crystal molecules of the liquid crystal material is further applied. The alignment film is subjected to an alignment film treatment such as a rubbing method.

Thereafter, as shown in FIG. 2, the glass substrate 3
A seal portion 9 made of an adhesive such as epoxy is formed on the portion 7 that has been subjected to the polishing process in 1. Then, spacers (not shown) are scattered on the alignment film, and another glass substrate (not shown) on which a transparent electrode or an alignment film is formed and the glass substrate 3 are made to face each other. Stuck together. Then, a liquid crystal material is filled between the pair of glass substrates, and the periphery of the glass substrate is sealed to produce a color liquid crystal display element.

The color liquid crystal display element manufactured as described above is further provided with a backlight such as a fluorescent tube.
A full-color display can be obtained by adjusting the amount of transmitted light of each of the red, green, and blue primary colors of the liquid crystal display element as needed.

As described above, in this embodiment, the residual film 2 of the photosensitive substrate 1 generated in the area other than the color filter area is
It is partially polished and removed using a buffing drill 4. As a result, the protective film 8 and the glass substrate 4 are in direct contact with each other at the portion 7 where the polishing process has been performed.

Therefore, the protective film 8 and the glass substrate 3 are formed.
The adhesive force with and is improved, and peeling of the protective film 8 is suppressed. As a result, especially under high temperature where the adhesive force is likely to decrease,
It is possible to improve reliability.

On the other hand, even when the seal portion is directly provided on the glass substrate, by polishing and removing the residual film of the photosensitive substrate, the adhesive force between the seal portion and the glass substrate is improved and the seal is improved. The peeling of the part is suppressed.

In this embodiment, the dyeing method has been described as an example of the method of forming the color filter, but the method of producing another color filter having a step of applying a photosensitive base material on the surface of the substrate is also applicable. The present invention can be applied.

[0026]

As described above, the method of manufacturing a color liquid crystal display device of the present invention is configured such that the residual film of the color filter formed on the substrate surface other than the color filter region is partially polished.

Therefore, in the portion where the residual film is polished, the substrate and the film formed on this substrate are brought into direct contact with each other, and the adhesive force between the film and the substrate is improved, so that peeling is suppressed. To be done. Therefore, there is an effect that the reliability is improved especially at a high temperature where the adhesive force is apt to decrease.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a manufacturing process of a color liquid crystal display element according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a liquid crystal display element manufactured by the manufacturing process of the color liquid crystal display element.

FIG. 3 is a cross-sectional view of a main part of a color liquid crystal display element manufactured by a conventional method for manufacturing a color liquid crystal display element.

[Explanation of symbols]

 1 Photosensitive Substrate 2 Residual Film 3 Glass Substrate (Substrate)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Osamu Osamu 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation

Claims (1)

[Claims] 1. A color liquid crystal display in which a photosensitive base material is applied to the surface of a substrate, a color filter region is selectively provided by utilizing photolithography, and then a film having an adhesive force to the substrate is formed. A method for manufacturing a color liquid crystal display element, which comprises partially polishing a residual film of a color filter formed on a surface of a substrate other than the color filter region in the element manufacturing method.