Toppan Printing Co., Ltd.

Toyo Ink Mfg. Co., Ltd.

Yukino Miyagawa

Mie Shimizu

Takeshi Itoi

Kazunori Yamada

Koichi Minato

Satoshi Okutsu

Hideyo Tanaka

Satoshi Ohkuma

Atsushi Nishida

Kenro Sunahara

Tomoyuki Kadowaki

Takashi Kanoh

A color filter includes a red filter segment, a green filter segment and a blue filter segment, on a substrate, wherein when a pseudo-white LED is used, an area of a triangle defined by three chromaticity points of the red, green and blue filter segments expressed as (x, y), (x, y) and (x, y) on the x-y chromaticity diagram occupies 72% or more of an area standard triangle defined by defined by 3 points of red (0.67, 0.33), green (0.21, 0.71) and blue (0.14, 0.08), and the color filter has a color temperature of 6000K or more. Each of the red, green and blue filter segments has a thickness of 3.3 &#x3bc;m or less. A liquid crystal display device includes such color filter and the pseudo-white LED.

Color filter and liquid crystal display device

A color filter includes red, green and blue filter segments and is adapted to be used in a liquid crystal display device using, as a light source, a white LED having specified spectral properties. The red filter segment has a 50% transmittance wavelength within a range of 595 to 610 nm and a transmittance of 85% or more at a wavelength of 630 nm. The blue filter segment has a maximum transmittance wavelength of 455 nm or less and a transmittance of 55% or more at a wavelength of 450 nm. A thickness of each of the red, green and blue filter segments is 3.0 &#x3bc;m or less. A liquid crystal display device including this color filter and the white LED is also disclosed.

Growing community of inventors

Tokyo, Japan

Yukino Miyagawa