JPH0812293B2 - Pinhole correction method for fine pattern filter - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a fine pattern filter used in combination with a liquid crystal display device when a television receiver using the liquid crystal display device is colorized.

[Prior art]

As shown in FIG. 4, a fine pattern filter 30 of this type has a red pattern 32R on a transparent substrate 31 such as glass,
It is obtained by printing the green pattern 32G and the blue pattern 32B in a predetermined pattern such as a band shape, but the pattern width of each of the above-mentioned patterns, for example, the red pattern 32R is only 100 μm, which is extremely fine. Therefore, the occurrence of the pinhole 33 is difficult to avoid due to factors such as attachment of dust during plate making or printing. Conventionally, when the pinhole 33 is generated, the pinhole 33 becomes noticeable to the viewer when the fine pattern filter 30 is used in combination with, for example, a liquid crystal display element. Since it is a serious defect that makes the whole 30 unusable, when the pinhole 33 occurs in the red pattern 32R, the red ink 34r printed with the red pattern 32R is printed.
The retouching step is performed by using the red ink 34r for the red pattern 32R,
34g green ink and blue pattern for 32G green pattern
Blue ink 34b for 32B was to be performed three times for each.

[Problems to be Solved by the Invention]

However, a closer examination of the conventional retouching process reveals that the pattern width is at most 100, as described above.
Since it is as thin as about μm, it often causes protrusion to an adjacent pattern in a manual retouching process, and at this time, color mixing occurs and the performance of the fine pattern filter 30 is greatly impaired. In addition, there is a problem that the above retouching process of three times is very complicated and reduces the production efficiency, and the solution of these problems is on the production process of the fine pattern filter 30. It was supposed to be an issue.

[Means for Solving the Problems]

The present invention is, as a specific means for solving the above-mentioned problems, a method of correcting a pinhole that occurs during the production of a fine pattern filter, wherein the pinhole is gray and the transmittance is almost the same as the average transmittance of the filter. The conventional problem is solved by providing a pinhole correction method for a fine pattern filter, which is characterized by performing the retouching step with the ink described above.

[Action]

According to the present invention, by performing the retouching step with an achromatic color ink having an intermediate transmittance, red, green,
The retouching process of the three colors of blue is performed once for achromatic color, and color mixture due to protrusion does not occur.

【Example】

Next, the present invention will be described in detail based on an embodiment shown in the drawings. Reference numeral 1 in FIG. 1 is a fine pattern filter showing an enlarged main part.
Red pattern 2R, green pattern 2G and blue pattern 2B
At the end of printing, the pinholes 3r, 3g, and 3b are generated as described in the conventional example. It should be noted that the drawing shows an example caused by a factor at the time of plate making. Normally, this kind of fine pattern filter 1 is one in which red, green and blue are printed three times by the same plate in order to improve product accuracy. Since there are pinholes 3r, 3g, 3b
Also occurs in the same pattern in the red pattern 2R, the green pattern 2G, and the blue pattern 2B. For correction of the pinholes 3r, 3g, 3b, a manual retouching step is performed in the same manner as described in the conventional example, but according to the present invention, the retouching step is red, green or blue. It is not performed three times with three colors, and as shown in FIG. 2, it is performed only once with one color of the ink 4 which is gray and has the same transmittance as the average transmittance of the fine pattern filter 1. Has been done. Next, the operation and effect when the retouching step is performed with one color of the ink which is gray and has the same transmittance as the average transmittance of the filter 1 will be described. Here, in order to facilitate understanding of the operation and effect of the present invention, the human luminosity characteristics will be described in advance. When the angle viewed from the viewpoint is narrower than a predetermined value, the color is not detected. , It is assumed that only the light and dark are detected, and accordingly, in a fine one such as the fine pattern filter 1, each of the red pattern 2R, the green pattern 2G and the blue pattern 2B is individually recognized at the time of viewing. Without being recognized, it is recognized as one surface of a substantially gray color that is a composite color. Thereby, the state of only the fine pattern filter 1,
Alternatively, in the state where an image is not displayed on the liquid crystal display element (not shown) provided on the back surface, the fine pattern filter 1 is viewed as a substantially gray surface. The retouching process does not give the viewer a feeling of strangeness, and in particular, the transmittance of the red pattern 2R, green pattern 2G and blue pattern 2B
It is possible to give no sense of incongruity by setting the above three average transmittances, that is, the transmittances approximately equal to the average transmittance of the filter 1. Next, a state in which the liquid crystal display element is driven and an image is displayed will be described. For example, the red pattern of the fine pattern filter 1
When the liquid crystal display element of the portion corresponding to 2R is driven and red is displayed in the periphery including the pinholes 3r, 3g, 3b, the pinholes 3r, 3g, 3b
Is a gray ink 4. The retouching process is performed with the gray ink 4. As a result, one pixel with pinholes 3r, 3g, and 3b emits achromatic color, that is, gray, while all the peripheral pixels emit red. It will be done. However, as described above, in a very narrow viewing angle range, the human visibility characteristic is poor in the ability to discriminate individual colors, and only the brightness difference is detected, so the transmittance of the ink 4 is By matching the pixels, one pixel including the pinholes 3r, 3g, 3b is not perceived as a different color. In addition, performing the retouching step with the gray ink 4 does not cause color mixing even if a pattern of another adjacent color is squeezed out, and the fine pattern filter 1
It also prevents deterioration of performance such as deterioration of purity caused by the above-mentioned color mixing. FIG. 3 shows another embodiment of the present invention, in which three pinholes 3r, 3g and 3b are formed so as to be lined up at the same corresponding positions caused by the above-mentioned factors during plate making. The retouching process is performed in one step,
Even when it is carried out in this way, the same operational effect as that of the previous embodiment does not cause any trouble that hinders practical use, and thus the number of steps can be further reduced.

As described above, according to the present invention, the method of correcting a pinhole that occurs when a fine pattern filter is manufactured is such that the pinhole is gray and the transmittance is almost the same as the average transmittance of the fine pattern filter. By performing the retouching process using ink, the difference between the color sensitivity characteristic and the luminance sensitivity characteristic of the human visual sensitivity characteristic is used to make corrections that do not hinder practical use three times: red, green, and blue. It has the excellent effect of dramatically improving the production efficiency of this type of fine pattern filter by once performing the retouching process that had been performed on
At the same time, the gray ink is used even when the ink is squeezed out during the process, so that color mixing does not occur and the performance is not affected, so that the process itself can be simplified.

[Brief description of drawings]

FIG. 1 and FIG. 2 are enlarged plan views of an essential part showing a pinhole correction method for a fine pattern filter according to the present invention in the order of steps, and FIG. 3 is an enlarged plan view showing another embodiment of the present invention. A plan view and FIG. 4 are plan views showing a conventional example. 1-fine pattern filter 2R-red pattern 2G-green pattern 2B-blue pattern 3r, 3g, 3b-pinhole 4-grey ink

Claims (1)

[Claims] 1. A method of correcting a pinhole generated during the production of a fine pattern filter, wherein the pinhole is retouched with an ink which is gray and has a transmittance substantially equal to the average transmittance of the filter. Pinhole correction method for fine pattern filters.