JPH0627315A - Manufacture of color filter - Google Patents

Abstract

PURPOSE:To enhance the transfer efficiency of a picture element and to obtain superior spectral diffraction and chromaticity characteristic by imparting an electric charge with polarity opposite to that of color toner from the back side of a filter substrate facing to the picture element, and transferring the picture element on a picture element plane on the filter substrate. CONSTITUTION:An electrostatic latent image can be formed by electrifying a light conductive layer 3 at ground 200V from the picture element side of a transfer supporting body 1 and exposing it via the light shielding mask of a picture element pattern after electrification is completed. After the electrostatic latent image is formed, developing is applied to it, and the picture element 5 is accomplished as a transfer material. After that, the electric charge with same polarity as that of the electrified charge of the toner is imparted by a corona electrifier 6. Thence, the filter substrate 4 is superimposed setting the picture element side of the transfer material at inside via the picture element 5, and the electric charge with polarity in the direction opposite to that of the electrified charge of the toner of the picture element 5 is imparted from the supporting body from the opposite side of the picture element by the corona electrifier 6. After electrification is completed, the filter substrate 4 is peeled from a transfer substrate, and electrostatic transfer on the filter substrate 4 from the transfer substrate of the picture element 5 can be completed.

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 for a liquid crystal display device, a solid-state image pickup device, and the like, and more specifically, a color filter according to an electrostatic latent image formed on a transfer substrate such as a photoconductor. The present invention relates to a method for manufacturing an electrophotographic color filter, which is manufactured by repeating a plurality of times of forming a pixel by adhering toner and electrostatically transferring the pixel to a filter substrate.

[0002]

2. Description of the Related Art Many methods for manufacturing color filters used in liquid crystal display devices have been proposed, and some methods have been put into practical use. For example, a substrate such as a transparent substrate is coated with a photosensitive resin, a desired pattern is formed according to a conventional method, the pattern is dyed red, and similarly, green and blue are dyed on the substrate. There is a dyeing method for forming pixels and manufacturing a color filter, and using a photosensitive resin in which pigments such as pigments and dyes are dispersed in advance, red, green, and blue pixels are sequentially formed on a substrate according to a conventional method. Electrodeposition for forming a pixel after forming a base by forming a desired pattern of a transparent conductive film on a support such as a transparent substrate or a colored resin method to be formed and then energizing only the pattern to be colored while energizing Method, there is a printing method for forming pixels by offset printing or the like. Besides the above method,
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 color filter manufacturing methods that have been put into practical use in the past, 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. Further, in the electrodeposition method, the pattern for the same color of the transparent conductive film must be connected to the pattern for the different color without being electrically connected, and not only the pixel shape and arrangement are restricted, but also the pattern of the transparent conductive film. Advanced technology requires advanced fine processing technology. The printing method does not require a photolithography process such as application, exposure, and development of a photosensitive solution, and the manufacturing process is relatively short, but the pattern shape and positional accuracy must be maintained at a high level, and a special printing technique is required. .

Therefore, as a simpler method for producing a color filter, a method relating to the production of a color filter by an electrophotographic method is disclosed in JP-A-48-16529, JP-A-56-69604, and JP-A-56-117210. JP-A-63-234203.

An electrophotographic color filter is a process in which a photoconductor is charged and then exposed through a predetermined mask to remove charges other than the pixel portion to form an electrostatic latent image for development. It can be manufactured relatively easily because it is manufactured in.

However, it is essential in the manufacturing principle for the electrophotographic color filter to have a conductive layer and a photoconductive layer on a support as a substrate, and these layers are the final stage of the color filter. It was clear that in addition to becoming functionally unnecessary, the light transmittance of the color filter is lowered.

From the above, a transfer type toner is produced by repeating a plurality of times, in which color toner is adhered on a transfer substrate to form a pixel and then the pixel is electrostatically transferred onto another filter substrate. In the electrophotographic color filter, pixels can be formed directly on the support that is the filter substrate. Therefore, if a transparent filter substrate is used, the light transmittance will be high, and the spectral characteristics and chromaticity characteristics will be excellent. It is attracting attention because it can be obtained.

The manufacturing process of the conventional electrophotographic color filter will be described below. The transfer substrate has a structure in which a transfer support 1, a conductor layer 2, and a photoconductor layer 3 are laminated in this order.

First, the photoconductor layer 3 on the pixel side on the transfer support 1 is charged to about 200 V using a charger. After charging is completed, it is exposed to light (UV
366 nm) to form an electrostatic latent image. After the electrostatic latent image is formed, development is performed to complete the pixel 5 as shown in the sectional view of FIG.

Next, the filter substrate 4 is overlaid on the transfer material 1 pixel side through the pixels 5, the filter substrate 4 is peeled off from the transfer material transfer substrate, and the filter substrate 4 is transferred from the pixel 5 transfer substrate. Complete the electrostatic transfer to. After that, a baking process is performed to fix the toner, and the image formation of the first color is completed. The second and subsequent pixels are formed by the electrostatic transfer method in the same process, and the color filter is completed.

[0011]

However, in the color filter using the transfer type electrophotographic system, the pixels cannot be completely transferred by simply electrostatically transferring the pixels.
That is, there is a problem that the transfer efficiency is low and therefore the transferred pixels do not have good spectral characteristics and chromaticity characteristics.

The present invention has been made by paying attention to the problems as described above, and its object is to enhance the transfer efficiency of pixels in the case of manufacturing a transfer type electrophotographic color filter, and The present invention provides a method of manufacturing a color filter having excellent spectral and chromaticity characteristics.

[0013]

The present invention relates to a method of manufacturing a color filter in which a color toner is adhered to a transfer material having pixels formed on the transfer substrate according to an electrostatic latent image formed on the transfer substrate. A transfer step in which the filter base is superposed with the pixel side facing, and a charge having a sign opposite to that of the color toner is applied by corona discharge from the non-pixel side of the filter base to electrostatically transfer the pixels to the pixel side on the filter base. Is repeated a plurality of times according to the type of color toner, and the pixels are formed in a pattern on the filter substrate.

In particular, before the transfer step, the effect of corona discharge is applied from the pixel surface side of the transfer material by the same corona discharge as the charge of the color toner forming the pixels. To give.

The present invention will be described in detail below with reference to the drawings. First, the transfer material used in the present invention will be described.
The transfer material used in the present invention has a structure in which a conductor layer 2 is provided on the pixel side of a transfer support 1 and a photoconductor layer 3 is further provided on the conductor layer 2 to form a pattern on a transfer substrate. It has a structure in which pixels are formed like a circle.

As the transfer support 1, an insulator such as glass or an organic polymer having strength as a transfer support may be used, or a conductor such as metal may be used.
In particular, when the transfer support 1 is a conductor such as a metal, the conductor layer 2 is unnecessary.

As the photoconductor layer 3, PVK (polyvinylcarbazole) or the like having photoconductivity is formed on the conductor support layer 1 of the conductor layer 2 or a conductor such as metal by a spin coating method or the like. Use one.

Further, the filter substrate 4 used in the present invention
In some cases, an insulator such as glass or an organic polymer compound having strength as a substrate is used, and in some cases, a conductor such as metal is used. Generally, glass or an organic polymer compound that is transparent and has strength as a substrate is used.

Next, the manufacturing process of the electrophotographic color filter of the present invention will be described. First, using a charger,
The photoconductor layer 3 is charged to about 200 V from the pixel side on the transfer support 1. After the charging is completed, exposure (UV366 nm) is performed through a light shielding mask having a pixel pattern to form an electrostatic latent image. After the electrostatic latent image is formed, development is performed to complete the pixel 5 and become a transfer material. After that, the pixel 5 is charged with the same sign as the polarity of the charge of the toner (pixel surface potentials 800 to 1).
000 V) is applied by the corona charger 6 as shown in the sectional view of FIG.

Next, as shown in the cross-sectional view of FIG. 2, the filter substrate 4 is overlapped with the pixel 5 of the transfer material on the pixel side.
A charge (transparent substrate surface potential 1500 to 2000 V) having a sign opposite to the polarity of the charge of the toner of the pixel 5 is applied from the non-pixel side from the support 4 by the corona charger 6.

After the charging is completed, the filter substrate 4 is peeled off from the transfer substrate to complete the electrostatic transfer of the pixels 5 from the transfer substrate to the filter substrate. After that, a baking process is performed to fix the toner, as shown in the sectional view of FIG.
The image formation for the first color is completed. The second and subsequent pixels are formed by the electrostatic transfer method in the same process, and the color filter is completed.

[0022]

In the method of manufacturing a color filter according to the present invention, the color toner is adhered to the pixel in accordance with the usual electrophotographic technique, that is, the electrostatic latent image formed on the electrophotographic color filter substrate. After forming, first
Corona discharge gives the same charge as the charge of the color toner forming the pixel on the pixel surface.

As a result, not one toner particle but one pixel has a certain electric charge, and then a filter substrate is superposed on the pixel surface so that the pixel surfaces are aligned with each other. By applying corona discharge from the filter substrate side with an electric charge having a sign opposite to the polarity of the charged electric charge of the toner, and peeling off the filter substrate that is the transfer destination from the transfer substrate, the pixel is not a toner particle Tend to be electrostatically transferred in a unit where
Electrostatic transfer with high transfer efficiency can be completed.

As described above, electrostatic transfer of the pixels formed on the photoconductor layer by the usual method to another transparent substrate having no conductive layer or photoconductive layer is repeated a plurality of times. It is possible to manufacture a color filter having excellent spectral and chromaticity characteristics in which the transfer efficiency of each pixel is enhanced and the light transmittance of the color filter is enhanced.

[0025]

EXAMPLE An example of the present invention will be described in detail. Poly-
Cyclohexanone 900 was added to 100 parts by weight of N-vinylcarbazole (manufactured by Anan Fragrance Co., Ltd., trade name Tubicor 210).
It was dissolved in parts by weight to prepare a mother liquor for the photoconductor layer. This mother liquor was applied to a soda glass with ITO by a spin coating method and then dried at 150 ° C. for 30 minutes in an oven,
A photoconductor layer having a thickness of about 2 μm was formed and used as a transfer substrate.

Next, the surface of the photoconductor layer was charged to +200 V using a corona charger. After the charging is completed, the photoconductive layer is exposed to light through a predetermined mask (black light 3
66 nm was used for 1 second) to form an electrostatic latent image.

Subsequently, a red colorant (trade name Spilon Red GRLH, manufactured by Hodogaya Chemical Co., Ltd.) was added to the white latex obtained by the reaction of the cyclized rubber and the halogen-containing methacrylate described in JP-A-62-269101. )
Dispersed in an isoparaffinic solvent (Esso Kagaku Co., Ltd.)
Manufacture, trade name Isopar G) was added to prepare a negatively charged red toner, which was immersed in the above toner liquid and developed,
A red pixel was formed on the photoconductive layer to obtain a transfer material.

After the development was completed, a negative charge having the same sign as the charge of the red toner was applied to the red pixel by corona discharge to charge the pixel surface to about 800V. Next, after charging is completed, the elemental glass that is the filter substrate of the transfer destination is placed on the transfer element that is the transfer source on which the red pixels are formed, and the polarity of the charged charge of the red toner is set from the elemental glass. Corona discharge with positive sign of opposite sign (power supply voltage + 8kV
After the application of the base glass surface potential + 2 kV), the base glass was peeled off from the transfer substrate, and the electrostatic transfer of the red pixels onto the base glass was completed. Subsequently, the glass element on which the red pixels were transferred was baked to fix the pixels.

Hereinafter, using a color toner, black,
Completed an electrophotographic color filter with good electrostatic transfer with excellent spectral and chromaticity characteristics in which pixels of each color of green and blue were sequentially formed by electrostatic transfer and formed directly on the glass. It was

[0030]

As described above, according to the present invention, color toner is adhered to form a pixel in accordance with the electrostatic latent image formed on the transfer substrate, and then the pixel is first formed on the pixel surface. Corona discharge gives a charge of the same sign as the color toner charge, and then the filter substrate is placed on the pixel surface. This time, a charge of the opposite sign to the charge of the color toner forming the pixel is corona discharged from the filter substrate. After that, the transfer efficiency of each pixel is increased and the light transmittance of the color filter is increased by repeating electrostatic transfer of the pixels to the filter substrate a plurality of times by peeling the filter substrate from the transfer substrate. It is possible to provide a method of manufacturing a color filter having excellent spectral characteristics and chromaticity characteristics by an electrophotographic method.

[0031]

[Brief description of drawings]

FIG. 1 is a cross-sectional view when a transfer material is charged in a manufacturing method of the present invention.

FIG. 2 is a cross-sectional view of a color filter during transfer in the manufacturing method of the present invention.

FIG. 3 is a completed sectional view of a color filter in the manufacturing method of the present invention.

FIG. 4 is a completed sectional view of a conventional color filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transfer support 2 ... Conductor layer 3 ... Photoconductor layer 4 ... Filter base 5 ... Pixel 6 ... Corona charger

Claims (2)

[Claims] 1. According to an electrostatic latent image formed on a transfer substrate,
The filter substrate is superposed on the transfer material, in which the color toner is adhered to form the pixels on the transfer substrate so that the pixel surface is directed, and a charge having a sign opposite to that of the color toner is applied by corona discharge from the non-pixel surface side of the filter substrate. A method for manufacturing a color filter, in which pixels are provided in a pattern on a filter substrate by repeating a transfer process of electrostatically transferring pixels to a pixel surface on a filter substrate for a plurality of types of color toner. 2. The color according to claim 1, wherein before the transfer step, a charge having the same sign as the charge of the color toner for forming pixels is applied from the pixel surface side of the transfer material by corona discharge. Filter manufacturing method.