JP2745613B2 - Manufacturing method of color filter - Google Patents

Description

The present invention relates to a method for manufacturing a color filter employing a transfer system.

[Prior Art] A color filter used in a liquid crystal color television or the like is formed by arranging a color pattern for each of red, green and blue on a transparent substrate, for example. Large screens and high quality are required.

Conventionally, a transfer method has been adopted as one of the methods for manufacturing a color filter. This conventional transfer method uses a filter substrate divided for each sheet, and transfers the color pattern of the transfer sheet to the filter substrate by applying pressure on a transfer sheet on which a color pattern of one color is formed. Then, a color pattern is obtained by transferring a color pattern for each color to a filter substrate in this procedure.

[Problem 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 with respect to 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, when the size of the filter substrate is increased, it is not possible to accurately align the entire filter substrate and the entire transfer sheet by using only a part thereof as a positioning reference, and a partial displacement may occur. As a result, there has been a problem that the transfer accuracy is reduced and it is difficult to obtain a high quality color filter.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a manufacturing method capable of performing transfer with high accuracy and obtaining a high quality color filter.

[Means and Actions for Solving the Problems] In order to achieve the above object, a method for manufacturing a color filter according to the present invention comprises forming a color pattern of a color filter on a belt-shaped transfer sheet via a release layer, and Forming position detection marks at intervals in the length direction, forming position detection marks at intervals in the length direction on the band-shaped filter substrate, and then separating the transfer sheet and the filter substrate. Pass the position detector, transfer roller and position adjusting roller sequentially while conveying by overlapping with guide rollers,
Before performing the transfer, the transfer roller is separated from the transfer sheet, and the position detector detects a position shift between the position detection mark of the transfer sheet and the position detection mark of the filter substrate. The position adjusting roller is driven in accordance with a detection signal from a detector to control the transfer state of the transfer sheet to adjust the positions of the two position detection marks, and then the transfer roller sets the color pattern of the transfer sheet. Is transferred to the filter substrate, and thereafter, the transfer sheet and the filter substrate are superimposed and conveyed, and the transfer is performed by performing the position shift detection and the position alignment.Each color pattern formed on the transfer sheet is sequentially transferred to the filter substrate. It is characterized in that it is transferred to a filter substrate.

That is, prior to transfer, the transfer sheet and the color filters are conveyed and transferred while being sequentially positioned, so that the entire transfer sheet and the entire color filter are accurately positioned and transferred with high precision. be able to.

Embodiment An embodiment of a method for manufacturing a color filter according to the present invention will be described below with reference to FIGS. 1 and 2.

First, a band-shaped transfer sheet 1 made of a flexible material provided with a release layer 2 is prepared, and the transfer sheet 1 is passed through a printing unit or a photolithography unit 11 to be separated by a printing method or a photolithography method. Color patterns 3 of a predetermined color are formed on the surface of the mold layer 2 at predetermined intervals in the longitudinal direction of the sheet. In the case of printing, rotary printing is possible. In this case, the transfer sheet 1 is formed by arranging a number of color patterns 3 corresponding to a plurality of color filters. Examples of the material of the transfer sheet 1 include a resin film, a blanket material such as silicon having good offset characteristics, and a metal foil subjected to a release treatment. Also, position detecting marks are formed on the transfer sheet 1 at intervals in the length direction. Further, a band-shaped filter substrate 4 is prepared, and a black pattern and a position detection mark are previously formed on the surface of the substrate by printing or photolithography as required. The material of the filter substrate 4 is a resin film,
A glass substrate.

Then, the transfer sheet 1 and the filter substrate 2 are overlapped with the color pattern forming surface of the transfer sheet 1 inside and the filter substrate 4 with the transfer surface inside, and the superposed transfer sheet 1 and filter substrate 4 are guided. It passes through the rollers 12 and 12 and temporarily aligns, and then passes near the position detector 13. After that, the transfer sheet 1 and the filter substrate 4 pass between the transfer rollers 14 and 14. At this time, the transfer sheet 1 and the filter substrate 4 are pressed and heated by the transfer rollers 14 to transfer the color pattern 3 formed on the transfer sheet 1 to the surface of the filter substrate 4. Then, the transfer sheet 1 and the filter substrate 4 are continuously conveyed, and the transfer rollers 14 and
By passing through 14, the color pattern 3 of the transfer sheet 1 is sequentially transferred to the surface of the filter substrate 4.

Thus, when the transfer sheet 1 and the filter substrate 4 pass through the position detector 13, the position detector 13 compares the position detection mark formed on the transfer sheet 1 with the position detection mark formed on the filter substrate 4. Overlap reading, misalignment of both marks (misalignment in the length direction of the transfer sheet)
To detect the amount of In accordance with a detection signal from the position detector 13, a position adjusting roller 15 provided behind the transfer rollers 14, 14 is driven to control the state of conveyance of the transfer sheet 1, thereby controlling the position of the transfer sheet 1. Mark and filter substrate 4
The position of the position detection mark is eliminated and the positions of both marks are matched.

That is, the position detector 13 may be of a type using a solid-state imaging device or of a type that optically reads an arc. In addition, when the transfer sheet 1 is opaque, a reflection method is used, and when the transfer sheet 1 is transparent, a position difference between each mark of the transfer sheet 1 and the mark of the filter substrate 4 is read. The transfer sheet position detection mark and the filter substrate position detection mark are formed at arbitrary intervals in the length direction (transport direction) of the transfer sheet and the filter substrate, respectively. The correction can be controlled.

Further, the position adjusting roller 15 can be moved up and down by a driving device (not shown) or the rotational speed (peripheral speed) can be changed. Transfer sheet 1 that has passed through transfer rollers 14 and 14
Through the position adjusting roller 15. The transfer roller 1
Each of the transfer units 4 and 14 is driven by a drive unit (not shown) for each transfer unit (a length corresponding to the length of one surface of the color filter) to temporarily separate from the transfer sheet 1. As a result, when the transfer roller 14 separates from the transfer sheet 1 for each transfer unit, the position adjustment roller 15 moves up and down or changes the rotation speed in synchronization with the signal of the position detector 13 to control the movement state of the transfer sheet 1. The marks on the transfer sheet 1 and the filter substrate 4 are aligned. By performing the position control in this manner, the transfer sheet 1 and the filter substrate 1 are aligned, and the aligned transfer sheet 1 and the filter substrate 4 are aligned.
Can be accurately transferred. And
The transfer sheet 1 and the filter substrate 4 are conveyed in a superimposed manner, the position is detected and the alignment is performed. Then, the transfer is performed, and the color patterns 3 formed on the transfer sheet 1 are sequentially transferred to the filter substrate 4 so that Transfer can be continuously performed with high accuracy. Therefore, the entire transfer sheet 1 and the entire filter substrate 4 can be accurately positioned and transferred with high accuracy. In this way, a plurality of high quality color filters can be manufactured. The position adjusting roller 15 corrects the change in the cycle due to the vertical movement of the transfer sheet 1 in the running direction, and also corrects the position in the left-right direction as necessary.

The transfer sheet 1 having been transferred in this way is passed through a washing unit and then wound up. When the transfer sheet 1 has an endless structure (a method of forming a color pattern by printing), the printing unit 11 is divided into three parts, and each unit is used each time a color pattern is formed. Further, the transferred filter substrate 4 is once taken out and put in again in the case of a glass substrate, and is endless in the case of flexible,
When the transfer of the first color has been completed and the second color has entered, the switching is performed in synchronization. Reference numerals 16 and 16 in FIG. 1 denote guide rollers for conveying the transfer sheet 1 and the filter substrate 4 after the transfer.

In order to prevent reverse transfer in the case where the transfer of the second color is performed after the transfer of the first color, a transparent resin layer serving as an intermediate layer may be provided on the release layer of the transfer sheet 1. Further, there is a method of fixing a transferred image by transferring the filter substrate 4 for the same purpose after the transfer of the filter substrate 4 to the extent that the pattern is not damaged.
There is also a method of performing vacuum assist pressing in a decompression chamber to improve transfer performance.

If the filter substrate 4 does not require a black surface, the first color may be formed on the substrate in advance.

The guide rollers 12 and 12 are the transfer sheet 1 and the filter substrate 4
The structure is such that no pressure is applied to the surface, or the image area is recessed to avoid transfer and contamination.

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

[Effects of the Invention] As described above, according to the color filter manufacturing method of the present invention, the transfer sheet and the filter substrate are accurately aligned and transferred with high accuracy to form a color pattern on the filter substrate. High quality color filters can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of the manufacturing method of the present invention, and FIG.
The figure shows a transfer sheet and a filter substrate in this embodiment. 1 ... Transfer sheet, 3 ... Color pattern, 4 ... Filter substrate, 13 ... Position detector, 14 ... Transfer roller, 15 ... Position adjusting roller.

Claims (1)

(57) [Claims] 1. A band-shaped transfer sheet, wherein a color pattern of a color filter is formed via a release layer and a position detecting mark is formed at an interval in a length direction of the transfer sheet. Forming a position detection mark with an interval in its length direction, then successively passing a position detector, a transfer roller and a position adjustment roller while conveying and transferring the transfer sheet and the filter substrate by guide rollers, Before performing the transfer, the transfer roller is separated from the transfer sheet, and the position detector detects a position shift between the position detection mark of the transfer sheet and the position detection mark of the filter substrate. The position adjusting roller is driven in accordance with a detection signal from a detector to control the state of conveyance of the transfer sheet to align the positions of the two position detection marks. The transfer roller transfers the color pattern of the transfer sheet to the filter substrate, and thereafter performs the transfer after performing the position shift detection and the alignment while transporting the transfer sheet and the filter substrate in an overlapping manner. A method for manufacturing a color filter, wherein each color pattern formed on a transfer sheet is sequentially transferred to the filter substrate.