Color filter for color display device

Abstract

The prevent invention provides a color filter for a color display device. The color filter can colorize the system of conventional monochrome electronic papers without the luminosity being deteriorated in a simple and inexpensive way. The color filter is characterized in that the color filter is used in a color display device which has a monochrome display device, and is arranged on a visual identity side of the monochrome display device; the color filter includes a transparent resin layer which is formed by a transparent resin composition containing a resin solution in which transparent resin is dissolved, and a coloring region is formed on the transparent resin layer by ink jet; the coloring region consists of coloring ink of multiple colors, and the coloring ink at least contains resin in a liquid state at room temperature, resin in a solid state at room temperature, colorant and solvent as necessary components; and the transparent resin layer only absorbs the solvent and the liquid resin of the coloring ink, and regions besides the coloring region are color-free or transparent.

Description

technical field [0001] The present invention relates to a color filter, and more specifically relates to a color filter used for color display devices such as reflective color displays. Background technique [0002] Electronic paper is actively being developed as an electronic medium replacing paper. Compared with CRT and liquid crystal displays, which are conventional displays, the characteristics required for electronic paper include: it is composed of a reflective display element, has high white reflectivity, high contrast, displays a memory effect, and can be used at a low voltage. drive, thin and light, and cheap. In particular, white reflectance and contrast of the same quality as paper are required as display characteristics. In addition, the conventional paper medium is naturally full-color display, and expectations for colorization of electronic paper are very high. [0003] As the technology of electronic paper capable of color display proposed so far, for examp...

AI Technical Summary

Problems solved by technology

In addition, the conventional paper medium is naturally full-color display, and expectations for the colorization of electronic paper are very high

[0003] As the technology of electronic paper capable of color display proposed so far, for example, the medium forming the color filter in the reflective liquid crystal device has all been commercialized, but since these usually use polarizers, the light utilization efficiency is low, and only Capable of darker white display

In addition, since black cannot be displayed, the contrast ratio is also poor

[0004] In addition, as a bright reflective display device, there is an electrophoretic method. The principle of the electrophoretic method is to move charged white particles and black particles through an electric field. However, the scattering reflectance of this device based on the white particles is less than 40%, and further improvement in reflection is required. efficiency

However, this surface treatment method needs to set conditions for making the contact angle of each transparent support substrate the same, which is not suitable for mass production, and the control range is also limited.

In addition, when the inkjet method is used to directly form a colored area on the panel, this surface treatment method may cause damage to the panel.

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