JPH05134107A - Color filter and its manufacture - Google Patents

Abstract

PURPOSE:To make the toner sticking amount in a same picture element at the time of picture element formation uniform easily and lessen the dispersion of spectrochromatic property regarding a color filter by electro-photograpy and provide a manufacturing method of the filter. CONSTITUTION:Each picture element is rectangle and all picture elements are arranged in the same direction. They are arranged in every other row in line direction and neighboring rows are shifted by a half length of the shorter side and they are arranged in every line in row direction. Three neighboring picture elements; red R picture element 1, green G picture element 2, and blue B picture element 3; occupy an apex of a triangle, resp. Further, the distance between nearest same color picture elements existing is the same in the line direction and the row direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter used in a liquid crystal display device, a solid-state image pickup device and the like. More specifically, the present invention relates to a so-called electrophotographic manufacturing method in which a color filter is manufactured by adhering toner according to an electrostatic latent image formed on a photoconductor layer.

[0002]

2. Description of the Related Art Many methods have been proposed for manufacturing color filters used in the above liquid crystal display devices, solid-state image pickup devices, etc., and some of them have been put into practical use. For example, after applying a photosensitive resin on a transparent substrate, a desired pixel pattern is formed according to one of the conventional methods, and then the pattern is dyed red, and in the same manner, green and then blue are sequentially dyed. Therefore, there is a dyeing method for producing a color filter. As another conventional method, using a photosensitive resin in which pigments such as pigments and dyes are previously dispersed,
There is a colored resin method in which red, green, and blue pixels are sequentially formed according to a normal photolithography method. Alternatively, as another conventional method, there is an electrodeposition method in which a desired pattern is formed by a transparent conductive film on a transparent substrate and then a colored resin is electrodeposited to form pixels by energizing only a pattern to be colored. is there. Then, there is a printing method for forming pixels by an offset printing method or the like. In addition to these methods, there are a method of forming pixels on a substrate by vacuum vapor deposition, a method of forming pixels with a silver halide emulsifier as in a color photograph, and the like.

Among the above-mentioned methods of manufacturing a color filter which have been put into practical use, the dyeing method and the coloring resin method require a relatively long time for coating and baking the photosensitive solution, and the process tends to be long. In addition, in the electrodeposition method, the same color pattern of the transparent conductive film must be connected to the different color pattern without being electrically connected, and not only the pixel shape and arrangement are restricted, but also the transparent conductive film. Advanced patterning technology is required for patterning. Although the printing method does not require a photolithography process such as coating, exposing, and developing a photosensitive solution, and the manufacturing process is relatively short, the pattern shape and position accuracy must be maintained at a high level, and the printing method is highly specialized. Requires printing technology.

Therefore, as a simpler method for producing a color filter, a method for producing a color filter by an electrophotographic system is being developed. A patent application relating to this has been filed, for example, JP-A-48-16529, JP-A-56-69604, and JP-A-56-11.
7210 and JP-A-63-234203.

In this electrophotographic color filter manufacturing method, the photoconductor layer is generally charged and then exposed through a predetermined mask to reduce or remove charges in regions other than the pixel portion. The toner is attached and developed according to the electrostatic latent image thus formed. For this reason, there is an advantage that it can be easily manufactured as compared with the conventional method.

However, in this system, the toner in the developing solution is moved and adhered onto the photoconductive layer due to the potential gradient between the non-pixel portion which is the exposed portion and the pixel portion which is the non-exposed portion. Since a pixel is formed, when the potential gradient between the non-pixel portion and the pixel portion differs in the vertical direction and the horizontal direction, that is, when the distances between the same-color pixels arranged in the vertical and horizontal directions are not equal to each other. Causes unevenness in toner adhesion within the same pixel, which causes the spectral chromaticity characteristics of the color filter to vary widely even within the same pixel, which is a very serious problem from the viewpoint of quality as a color filter. I will end up.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of manufacturing a color filter by the electrophotographic method, and a method of forming a pixel in the same pixel at the time of pixel formation. It is an object of the present invention to provide a color filter and a method for manufacturing the same that can easily make the toner adhesion amount uniform and reduce the variation of the spectral chromaticity characteristics in the same pixel.

[0008]

The means provided by the present invention for solving the above-mentioned problems is to repeat a plurality of times that toner adheres according to an electrostatic latent image formed on a substrate. In the so-called electrophotographic color filter manufactured by (a) each pixel has a rectangular shape and all pixels are arranged in the same direction.
(B) If the direction along the long side is the row direction and the direction along the short side is the column direction, then every other column is aligned in the row direction, and adjacent columns are half the length of the short side. It should be offset by a certain amount, and all columns should be aligned in the column direction.
(C) Red (R), green (G), which are adjacent to each other,
And each of the three pixels of blue (B) occupy the arrangement that forms the apex of the triangle. (D) The intervals between the closest pixels of the same color in the row direction and in the column direction are equal to each other. A color filter comprising the above (i) to (d).

Further, in a method of manufacturing a color filter by a so-called electrophotographic method, which is manufactured by repeating a plurality of times that toner adheres according to an electrostatic latent image formed on a substrate, One pixel is a rectangle,
Arrange all pixels in the same direction. (F) If the direction along the long side is the row direction and the direction along the short side is the column direction, then every other pixel is aligned in the row direction and adjacent columns are halved of the short side. The lengths of the columns should be offset from each other, and all columns should be aligned in the column direction. (G) Arranging the three pixels of red (R), green (G), and blue (B) adjacent to each other to form the apexes of a triangle. (H) The intervals between the nearest pixels of the same color in the row direction and in the column direction are equal to each other. There is also provided a method of manufacturing a color filter comprising the above (e) to (h).

The present invention will be described in detail below. First, the substrate used in the present invention has a structure in which a conductor layer is provided on a support and a photoconductor layer is further provided on the conductor layer. As the support, one having transparency and strength as the support is used, for example, glass or an organic polymer compound. The conductor layer is transparent and has a conductivity functioning as a channel for charges flowing in and out of the photoconductor layer during charging, exposure and development, and the material thereof is, for example, ITO (indium-tin oxide). object),
Alternatively, oxides of metals such as tin are suitable. In addition, the form is a thin film, and the metal oxide can be easily formed on the support by a sputtering method or a vacuum deposition method, but other known film forming means may be used as long as the base material is not damaged. Absent. The photoconductor layer is required to have at least photoconductivity and transparency. As an example, PVK (polyvinylcarbazole) is used as the material, and after spin coating on the conductor layer, It can be easily obtained by performing a baking process to form a film.

Next, in the electrophotographic color filter manufacturing method of the present invention, as an example, in the case of normal development, that is, toner adheres to the electrostatic latent image portion on the photoconductor layer having a high charging potential. The case will be described.

First, the photoconductor layer is charged by using, for example, a corona charger. After the completion of charging, exposure is performed through a mask provided with a pattern corresponding to all pixels for each color in the above arrangement as a light-shielding portion, and an electrostatic latent image for the first color is formed. Each electrostatic latent image portion corresponding to the pixel of the first color has a certain constant potential, and has a higher potential than the exposed portion around each electrostatic latent image portion. After the electrostatic latent image is formed, a toner for the first color having a charge polarity opposite to that of the electrostatic latent image is attached and developed, and baking is performed for fixing the toner to complete the pixel for the first color. Subsequently, pixels of the second and subsequent colors are formed in the same process to complete the color filter.

In the development, a developer prepared by dispersing and adjusting the toner charged to the opposite charge polarity as described above is prepared, and the substrate for the color filter being prepared is immersed in the developer. Is.

[0014]

According to the electrophotographic color filter and the method for manufacturing the same of the present invention, since the neighboring pixels of the same color on the row direction and on the column direction have the same interval, each pixel relating to any one color. The electric potential gradient between the part and the other part around the part becomes equal to each other in the row direction and the column direction, and the substrate for the color filter under fabrication on which the electrostatic latent image is formed is immersed in a developer. At this time, although the toner of the interface and the vicinity of the interface other than the pixel portion relating to the one color moves to the pixel portion, it tends to have a directionality largely deviated in the row direction and the column direction of the same pixel portion. , And are adhered to the same pixel portion sufficiently uniformly.

[0015]

EXAMPLE An example of the present invention will be described in detail.

First, 100 parts by weight of poly-N-vinylcarbazole (manufactured by Anan Perfume Co., Ltd., trade name Tubicol 210) was dissolved in 900 parts by weight of cyclohexanone to prepare a mother liquor for the photoconductor layer. This mother liquor was applied to a soda glass substrate with ITO by spin coating and then dried at 150 ° C. for 30 minutes in an oven to form a photoconductor layer having a thickness of about 2 μm.

Next, the surface of the photoconductor layer was charged to +200 V using a corona charger. After the charging is completed, the photoconductor layer is selectively exposed through a mask of a pixel pattern for the first color, which has been designed in advance based on the constitutional requirements of the present invention (light source: wavelength 366n manufactured by Black Light Co., Ltd.).
m, exposure time 1 sec) to form an electrostatic latent image.

In the mask, the length of each rectangular pixel in the row direction (long side) and column direction (short side) is 200 μm and 100 μm, respectively, and the width of the black matrix for shading is also in the row direction. And the column direction were 30 μm and 20 μm, respectively.

Subsequently, the substrate on which the electrostatic latent image was formed was dipped in a developer prepared in advance to develop a red (R) pixel. After that, baking is performed at 70 ° C. for 15 minutes to fix the red (R) toner, and the red (R) toner is fixed.
Of pixels were formed.

The developing solution is disclosed in JP-A-62-2691.
In the white latex obtained by the reaction of the cyclized rubber described in No. 01 and a halogen-containing methacrylate, a red colorant (Hodogaya Chemical Co., Ltd., trade name Spilon Read GRLH)
Dispersed in an isoparaffinic solvent (Esso Chemical Co.,
A negatively charged liquid red (R) toner prepared by adding the product name Isopar G) is prepared.

Following the same steps, using predetermined masks for the pixel patterns of the second color and the third color and developing solutions for green (G) and blue (B), respectively. Of pixels were formed. The pixel pattern of the completed color filter is as shown in (FIG. 1). As a result, it was possible to obtain a good color filter by the electrophotographic method, in which there was no difference in density within the pixel and there were no variations in spectral chromaticity characteristics within one pixel.

[0022]

As described above, according to the present invention, all of the pixels related to an arbitrary color have the same spacing in the row direction from the nearest neighboring pixels of the same color in the row direction and the column direction. And the column direction are equal, the potential gradient between each one pixel portion and its surrounding portion is equal in the row direction and the column direction, so the behavior of the toner during development can be used in a well-balanced manner. To provide a good quality color filter in which the amount of toner adhered in the same pixel at the time of pixel formation is uniform and the variation of spectral chromaticity characteristics is reduced even when an electrophotographic method is used, and a manufacturing method thereof. Was completed.

[0023]

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a pixel arrangement of a color filter according to an electrophotographic method according to an embodiment of the present invention.

[Explanation of symbols]

 1 ... Red pixel 2 ... Green pixel 3 ... Blue pixel 4 ... Black matrix

Claims (2)

[Claims] 1. A color filter by a so-called electrophotographic method, which is produced by repeating a process in which toner adheres in accordance with an electrostatic latent image formed on a substrate, a plurality of times. It has a rectangular shape and all pixels are arranged in the same direction. (B) If the direction along the long side is the row direction and the direction along the short side is the column direction, then every other column is aligned in the row direction, and adjacent columns are half the length of the short side. It should be offset by a certain amount, and all columns should be aligned in the column direction. (C) Red (R), green (G), which are adjacent to each other,
And each of the three pixels of blue (B) occupy the arrangement that forms the apex of the triangle. (D) The intervals between the closest pixels of the same color in the row direction and in the column direction are equal to each other. A color filter comprising the above (a) to (d). 2. A method of manufacturing a color filter by a so-called electrophotographic method, which is manufactured by repeating a plurality of times that toner adheres in accordance with an electrostatic latent image formed on a substrate. Make one pixel rectangular and arrange all pixels in the same direction. (F) If the direction along the long side is the row direction and the direction along the short side is the column direction, then every other pixel is aligned in the row direction and adjacent columns are halved of the short side. The lengths of the columns should be offset from each other, and all columns should be aligned in the column direction. (G) Red (R), green (G), which are adjacent to each other
Then, arrange each of the three pixels of blue (B) to form the vertices of a triangle. (H) The intervals between the nearest pixels of the same color in the row direction and in the column direction are equal to each other. A method of manufacturing a color filter comprising the above (e) to (h).