JP2000035582A - Spacer forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a gritty feel and to improve quality by packing ink mingled with spacer beads into an intaglio and executing printing by gravure offset printing. SOLUTION: The surface of a filter substrate is provided with the spacer beads 6 by gravure offset printing. In this forming method, the resin prepd. by incorporating the spacer beads 6 at 20 to 60% by weight % into a resin of 2000 to 25000 cm poises in viscosity is used as the ink. The spacer beads 6 are formed to a spherical shape and the intaglio formed with a cell opening diameter at 1 to 2 times the spherical diameter and a cell depth at 0.5 to 2 times the same is used. As a result, the regular placement of the spacer beads 6 for controlling the cell gap 7 between the filter substrate 20 and a counter substrate 21 in the positions of light shielding parts 22 is made possible. Since there are no spacer beads in pixel parts, there is no display disturbance of the pixels by the spacer beads and the gritty feel at the time of display of videos is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a spacer forming method for improving a method of dispersing spacer beads in a liquid crystal display device.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, as shown in FIG. 7, spacer beads 6 are scattered between a filter substrate 20 and a counter substrate 21 to control a cell gap 7 between the substrates. . At the time of this spraying, a method of mixing beads in a solvent and spraying them, or a method of scattering them with high-pressure air is generally used.

[0003]

However, according to the above-described conventional spraying method, the position where the spacer beads 6 are installed is not specified by the light-shielding portion 22, but is located at the display pixel portion 8 or when a few pieces are aggregated. This causes a reduction in display quality such as roughness.

[0004]

SUMMARY OF THE INVENTION The present invention employs a method of regularly placing spacer beads at a predetermined position at a light shielding portion of a filter substrate in order to eliminate roughness and improve quality. The main purpose of the method is to fill an intaglio plate with an ink mixed with spacer beads and to perform printing by gravure offset printing.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, in a spacer forming method for controlling a cell gap of a liquid crystal display device, spacer beads are provided on a filter substrate by gravure offset printing.

In the above-described forming method, a resin obtained by mixing 20 to 60% by weight of a spacer bead into a resin having a viscosity of 2000 to 25000 cm poise is used as an ink.

The spacer beads are formed in a spherical shape and have a spherical diameter of 1 to
An intaglio having twice the cell opening diameter and 0.5 to 2 times the cell depth is used.

In supplying ink to the plate, two blades, an ink supply blade for the intaglio plate and an ink scraping blade, are used.

When transferring the resin from the intaglio surface to the filter substrate, a silicon bracket is used as a transfer sheet.

In order to transfer the resin from the intaglio surface to the filter substrate, a resin relief plate may be used as a transfer sheet in addition to the silicon bracket.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment (corresponding to claim 5) will be described with reference to the drawings. In the experimental printing press shown in FIG. Work surface plate 1 provided with 11 and filter substrate 20
2, and a bogie frame 13 is provided on the main body frame 10.

The carriage frame 13 can be moved on each of the base plates by a power source provided on the main body frame 10, and the transfer frame 14 is supported on the carriage frame 13 to move up and down at an arbitrary position. it can. The transfer sheet 3 is mounted on the outer peripheral surface of the transfer cylinder 14, and the carriage frame 13 is provided with an ink supply device 15, an ink supply blade 1 supported by and fixed to an air cylinder for elevating, and an ink scraping blade 2. Each is provided.

The production of the intaglio 9 will be described with reference to FIG.
An etching resist 18 is applied to a glass substrate 17 on which the thin film chromium 16 has been applied (A). After drying, the resist 18 is exposed and developed with a predetermined mask to selectively remove the resist 18 (B). Next, chromium is etched with a chromium etchant (c), the remaining resist 18 is removed (d), and the glass substrate 17 is etched with a glass etchant (HF-based hydrofluoric acid) using the thin chromium 16 as a resist film. Then, an intaglio 9 having an opening of 7 to 10 μ and a depth of 3 to 8 μ was obtained.

The recess 19 of the intaglio 9 is
Is designed in advance so as to be positioned at the light shielding portion 22.

The ink was prepared by mixing 5 μm resin spacer beads (Micropearl-Sekisui Chemical) with a viscosity of 2000 to 25.
20-60 watts to 000cm poise polyester resin
t%, and a fixing agent was added to obtain an ink.

The manufacturing method will be described with reference to FIG.
The intaglio 9 is set on the printing platen 11 of the printing press, and the silicon blanket 4 is mounted on the transfer cylinder 14. The ink 24 is dropped onto the intaglio 9 from the ink supply device 15 (A). The remaining ink is scraped off by the ink scraping blade 2 while the ink supply blade 1 is leveling the ink while moving the carriage frame 13 (b), and the transfer cylinder 14 is intaglio 9
Then, the ink 24 is transferred to the transfer sheet 3 to transfer the ink on the transfer sheet 3 to the filter substrate 20.
(4) Transfer to the surface (see FIG. 4).

The second embodiment (corresponding to claim 6) will be described. The operation is the same as that of the first embodiment until the ink is put into the intaglio 9. The transfer cylinder has a recess 1 of the intaglio 9 in advance.
The resin relief plate 5 molded so that the portion located at 9 becomes the projection 23 is mounted as a transfer sheet. With this transfer cylinder, ink is transferred from the intaglio to the transfer cylinder, and further transferred from the transfer cylinder to the filter substrate 20 (see FIG. 5).

By performing the first and second embodiments, the spacer beads 6 for controlling the cell gap 7 between the filter substrate 20 and the opposing substrate 21 can be regularly placed at the position of the light shielding portion 22. (See FIG. 6).

[0019]

The present invention has the following specific effects by being implemented in the above-described embodiment.

Since the spacer beads are regularly arranged on the light-shielding portion of the filter substrate, the cell gap is kept uniform. On the other hand, since there are no spacer beads in the pixel portion, the display of pixels by the spacer beads is not disturbed.
Roughness in displaying images was eliminated, and contrast was improved by 50% as compared with the conventional method.

As in the second embodiment, by using a relief plate having a convex portion only at the position where the spacer beads are placed, the present invention can be carried out without touching the filter surface other than the position. The present invention can be carried out after the "alignment treatment of the filter substrate surface", and can be incorporated into the liquid crystal cell integrated line without significant change.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an experimental mechanism.

FIG. 2 is an explanatory diagram of an intaglio production process.

FIG. 3 is an explanatory view of an operation principle.

FIG. 4 is an explanatory diagram illustrating how a silicone bracket is mounted on the transfer cylinder and ink is transferred in the first embodiment.

FIG. 5 is an explanatory view illustrating how a resin relief plate is mounted on a transfer cylinder and ink is transferred in a second embodiment.

FIG. 6 is an explanatory view of laying spacer beads according to the present invention.

FIG. 7 is an explanatory view of dispersing spacer beads in a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink supply blade 2 Ink scraping blade 3 Transfer sheet 4 Silicon blanket 5 Resin letterpress 6 Spacer bead 7 Cell gap 8 Pixel part 9 Intaglio 10 Body frame 11 Printing platen plate 12 Work platen 13 Cart frame 14 Transfer cylinder 15 Ink supply Apparatus 16 Thin-film chromium 17 Glass substrate 18 Resist 19 Depression 20 Filter substrate 21 Opposite substrate 22 Light-shielding part 23 Convex part 24 Ink

Claims (6)

[Claims] 1. A spacer forming method for controlling a cell gap of a liquid crystal display device, wherein spacer beads are provided on a filter substrate by gravure offset printing. 2. The method according to claim 1, wherein the spacer beads have a viscosity of 2000 to 25.
2. The method for forming a spacer according to claim 1, wherein a resin obtained by mixing 20 to 60% by weight into a resin having a size of 000 cm poise is used as an ink. 3. The method according to claim 1, wherein the spacer beads are spherical and have a spherical diameter of 1 mm.
3. The method for forming a spacer according to claim 2, wherein an intaglio having a cell opening diameter of about 2 to 2 times and a cell depth of 0.5 to 2 times is used. 4. The method for forming a spacer according to claim 3, wherein the ink is supplied to the plate using two blades, an ink supply blade for the intaglio plate and an ink scraping blade. 5. The method according to claim 4, wherein a silicone blanket is used as a transfer sheet when transferring the resin from the intaglio surface to the filter substrate. 6. The method for forming a spacer according to claim 4, wherein a resin letterpress is used as a transfer sheet when transferring the resin from the intaglio surface to the filter substrate.