Browse Prior Art Database

Color Filter for Liquid Crystal Display

IP.com Disclosure Number: IPCOM000100360D
Original Publication Date: 1990-Apr-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Ueki, T: AUTHOR [+2]

Abstract

Disclosed is a color filter which is capable of controlling a color temperature of white balance.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Color Filter for Liquid Crystal Display

       Disclosed is a color filter which is capable of
controlling a color temperature of white balance.

      If a light source spectrum before passing through a color
filter is expressed by P(g), tristimulus values of a luminous
spectrum are given by Equation (1) shown below.

                            (Image Omitted)

      Transmitted spectra of each color pixel, red, green and blue,
are given by Equation (2) shown below and a transmittance changes as
functions of color filter thickness and coloring matters.

      Since the white balance changes in accordance with an additive
color mixture, given by Equation (3) below, a required white balance
can be obtained by controlling transmission spectra of each color
pixel.

      In order to keep a high color temperature of white balance, the
transmission spectra of each color pixel, Ti(g, d), is defined by
controlling the thickness of each color pixel and selecting
appropriate coloring matters.

      The color filter disclosed herein makes it possible to save
power consumption of backlight and to give clearer images because
white color with higher color temperature is brighter for human eyes.