JPH02176703A - Manufacture of color filter - Google Patents

Abstract

PURPOSE:To perform precise transfer and to obtain the color filter of high quality by conveying a transfer sheet and respective parts of the color filter while aligning them in order prior to the transfer, and then carrying out the transfer. CONSTITUTION:Color patterns 3 of the color filter are formed on the beltlike transfer sheet 1 across a peeling layer and then the transfer sheet 1 and a beltlike filter substrate 4 are put one over the other. Then they are conveyed continuously while their positions are controlled according to a figure which is already patterned on the substrate 4 such as black stripes, a black matrix, positioning marks, and a printed pattern. Then they are run between transfer rollers to transfer the color pattern 3 of the transfer sheet 1 to the filter substrate 4. Consequently, the transfer is precisely performed to form the color pattern on the filter substrate, thereby obtaining the color filter of high quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a color filter using a transfer method.

[Prior Art] Color filters used in LCD color televisions and the like are formed by arranging color patterns for each color, for example, red, green, and blue, on a transparent substrate. There is a growing demand for larger screens and higher quality.

Conventionally, a transfer method has been adopted as one of the methods for manufacturing color filters. This conventional transfer method uses a filter substrate that is divided into sheets, and the color pattern of the transfer sheet is transferred to the filter substrate by stacking the transfer sheets each forming a color pattern of one color and applying pressure. In this method, a color pattern is transferred one color at a time onto a filter substrate using this procedure to obtain a color filter.

[Problems to be Solved by the Invention] However, in this manufacturing method, when performing transfer, the entire filter substrate and the entire transfer sheet are aligned using a part of the filter substrate as a positioning reference, and the color of the transfer sheet is adjusted. The pattern is transferred to the filter substrate.

However, as the size of the filter substrate increases,
If only a part of the filter board is used as a positioning reference, it will not be possible to accurately align the entire filter substrate and the entire transfer sheet, and partial positional deviation may occur.As a result, the transfer accuracy will decrease and high quality There was a problem that it was difficult to obtain color filters.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a manufacturing method capable of performing accurate transfer and obtaining a high quality color filter.

[Means and effects for solving the problem] In order to achieve the above object, the method for manufacturing a color filter of the present invention involves forming a color pattern of a color filter on a band-shaped transfer sheet via a release layer, and then applying the color pattern to the transfer sheet. The transfer sheet and the band-shaped filter substrate are overlapped, and the position of both is controlled based on the patterns that have already been made into patterns on the substrate, such as black stripes, black matrices, alignment marks, and printed color buttons. The color pattern of the transfer sheet is transferred to the filter substrate by continuously conveying the transfer sheet and passing it between transfer rollers.

In other words, transcribe before transcribe!・Since each part of the color filter is conveyed and transferred while being aligned in sequence, the entire transfer sheet and the entire color filter are transferred.
It is possible to perform positioning with high precision and transfer with high precision.

[Example] An example of the method for manufacturing a color filter according to the present invention will be described below with reference to FIGS. 1 and 2. A strip-shaped transfer sheet 1 is prepared, and this transfer sheet 1 is transferred to a printing unit or a photolithography turn. 3 are arranged side by side at a predetermined interval in the longitudinal direction of the sheet. In the case of printing, rotary printing is possible. In this case, the number of color patterns 3 corresponding to a plurality of color filters are arranged and formed on the transfer sheet 1. [Transfer Sheet] Materials for 1 include resin films, metal foils that have been subjected to blanket release treatment such as silicone with good offset characteristics, and the like. Further, a band-shaped filter substrate 4 is prepared, and a black pattern and a position detection mark are formed in advance on the surface of this substrate by a printing method or a photolithography method as required. Materials for the filter substrate 4 include resin films and glass substrates.

Then, the color pattern forming side of the transfer sheet 1 is turned inside,
Also, place the filter substrate 4 on the transfer sheet 1 with the transfer surface inside.
and filter substrate 2 are superimposed, and the superimposed transfer sheet 1 and filter substrate 4 are passed between guide rollers 12 and 12 for temporary alignment, and then passed near the position detector 13. Transfer sheet 1 and filter substrate 4 then pass between transfer rollers 14.14. At this time, the transfer sheet 1 and the filter substrate 4 are pressed and heated by the transfer roller 4° 14z to form the color pattern 3 on the transfer sheet 1 and transfer it to the surface of the filter substrate 4. The color pattern 3 of the transfer sheet 1 is sequentially transferred onto the surface of the filter substrate 4 by conveying the transfer sheet 1 and the filter substrate 4 continuously and passing through the transfer rollers 4.14.

Therefore, when the transfer sheet 1 and the filter substrate 4 pass the position detector 13, the position detector 13 detects the transfer sheet 1.
The position detection mark formed on the filter substrate 4 and the position detection mark formed on the filter substrate 4 are read in an overlapping manner, and the positional deviation m of both marks is detected. Then, in response to the detection signal from the position detector 13, the position adjustment roller 5 provided behind the transfer roller 4. The positional deviation between the mark and the position detection mark on the filter substrate 4 is eliminated, and the positions of both marks are aligned (matched).

That is, examples of the position detector 13 include a type that uses a solid-state imaging probe or a type that optically reads an arc. Further, when the transfer sheet 1 is opaque, the reflection method is used, and when the transfer sheet 1 is transparent, the transmission method is used to read the misalignment of each mark on the transfer sheet 1 and the filter substrate 4 by one plane. Note that the position detection marks are formed at arbitrary intervals, and detection/correction can be controlled for each transfer unit.

Further, the position adjustment roller 15 can be moved up and down by a drive device (not shown) or its rotational speed (peripheral speed) can be changed. The transfer sheet 1 that has passed through the transfer rollers 14 is passed through a position adjustment roller 15. The transfer rollers 14, 14 are driven by a drive device (not shown) and temporarily separated from the transfer sheet 1 for each transfer unit (generally, the length corresponds to the length of each surface of a color filter).

As a result, the transfer roller 14 is moved to the transfer sheet 1 for each transfer unit.
When the transfer sheet 1 is separated, the position adjustment roller 15 moves up and down or changes the rotational speed in synchronization with the signal from the position detector 13 to control the moving state of the transfer sheet 1 and align each mark on the transfer sheet 1 and the filter substrate 4. do. By controlling the position in this manner, the transfer sheet 1 and the filter substrate 1 are aligned, and the aligned portions of the transfer sheet 1 and the filter substrate 4 can be transferred with high precision.

By sequentially controlling the position of each portion in the longitudinal direction as the transfer sheet 1 and filter substrate 4 are transported, it is possible to transfer each portion continuously with high accuracy. Therefore, the entire transfer sheet 1 and the entire filter substrate 4 can be aligned with high precision and transferred with high precision.

In this way, a plurality of high quality color filters can be manufactured. Note that the position adjustment roller 15 corrects the periodic change due to the downward movement of the transfer sheet 1 in the running direction, and also corrects the position in the left and right direction as necessary.

The transfer sheet 1 that has been transferred in this manner is passed through a cleaning unit and then wound up. When the transfer sheet 1 is to have an endless structure (a method in which color patterns are formed by printing), the printing unit] 1 is divided into three parts, and each unit is used each time a color pattern is formed. In addition, if the filter substrate 4 that has already been transferred is a glass substrate, it can be taken out once and put back in, or if it is a flexible one, it can be used as an endless filter substrate.
Switching is performed in synchronization when the transfer of the first color is completed and the second color is transferred. Note that reference numeral 16.16 in FIG. 1 is a guide roller that conveys the transfer sheet 1 and filter substrate 4 after transfer.

In order to prevent reverse transfer when transferring the second color after transferring the first color, it is preferable to provide a transparent resin layer serving as an intermediate layer on the release layer of the transfer sheet 1.

Furthermore, for the same purpose, there is also a method of fixing the transferred image after transferring the filter substrate 4 by a method such as ultraviolet irradiation within a range that does not damage the pattern. There is also a method of vacuum assisted pressing in a reduced pressure chamber to improve transfer performance.

If the filter substrate 4 does not require a black surface,
It is better to form the first color on the substrate in advance.

The guide rollers 12, 12 should have a structure that does not apply pressure to the transfer sheet 1 and the filter substrate 4, or should have four image areas to avoid transfer and dirt.

As the transfer method, in addition to thermal transfer, transfer using only pressure can be used.

[Effects of the Invention] As explained above, according to the method for manufacturing a color filter of the present invention, a color pattern is formed on the filter substrate by accurately aligning the transfer sheet and the filter substrate and performing transfer with high precision. High quality color filters can be obtained.

[Brief explanation of the drawing]

It is a figure showing a board. DESCRIPTION OF SYMBOLS 1... Transfer sheet, 3... Color pattern, 4... Filter board, 13... Position detector, 14... Transfer roller, 15... Position adjustment roller. Applicant's agent Patent attorney Takehiko Suzue] 0

Claims (1)

[Claims] A color pattern of a color filter is formed on a belt-shaped transfer sheet via a release layer, and then the transfer sheet and a filter substrate are overlapped, and the positions of both are controlled based on the figure already patterned on the substrate. 1. A method of manufacturing a color filter, which comprises continuously conveying the sheet and passing it between transfer rollers to transfer the color pattern of the transfer sheet to the filter substrate.