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Color Filter for Liquid Crystal Displays

IP.com Disclosure Number: IPCOM000116229D
Original Publication Date: 1995-Aug-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Yamanaka, H: AUTHOR

Abstract

Disclosed is a green color filter for Liquid Crystal Displays (LCDs) in which negative type photoresist includes prime blue organic pigment other than prime green and yellow.

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Color Filter for Liquid Crystal Displays

      Disclosed is a green color filter for Liquid Crystal Displays
(LCDs) in which negative type photoresist includes prime blue organic
pigment other than prime green and yellow.

      LCD module color points, red, green, blue and white, are
determined by color filter transmittance spectrum and backlight
emission spectrum which fulfill light source function.  Red, green
and blue color points are given by Equation (1), in which tristimulus
values are obtained by spectrum integration that passing through a
color filter according to Equation (2).
  Equation (1)
    x(i) = X(i) / (X(i) + Y(i) + Z(i))
    y(i) = Y(i) / (X(i) + Y(i) + Z(i))
      x(i), y(i) : CIE 1931 chromaticities
      X(i), Y(i), Z(i) : tristimulus values
      i = Red, Green, Blue, White
  Equation (2)
    X(i) = Sigma from 380 to 780((BL(lambda)CF(lambda)x-bar(lambda))
    Y(i) = Sigma from 380 to 780((BL(lambda)CF(lambda)y-bar(lambda))
    Z(i) = Sigma from 380 to 780((BL(lambda)CF(lambda)z-bar(lambda))
      lambda : wave length[nm
      BL(lambda) : backlight emission spectrum
      CF(lambda) : color filter transmittance spectrum
      x-bar(lambda) : color matching function
      y-bar(lambda)
      z-bar(lambda)

      Conventional green color filter mainly includes prime green
pigment and supplementary prime yellow, which improves transmittance
spectrum at the point of spectrum chara...