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Transflective mode color liquid crystal display

  • US 6,867,833 B2
  • Filed: 03/26/2002
  • Issued: 03/15/2005
  • Est. Priority Date: 03/26/2002
  • Status: Expired due to Term
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Assignment
First Claim
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1. A transflective mode color LCD, comprising:

  • a transflective mode color LCD panel composed at least of a pair of opposite transparent substrates with a liquid crystal layer sandwiched between them and also provided with a partly transmitive and partly reflective semi-reflective layer;

    a backlight source whose main composite components within the visible light region are composed at least of red, green, and blue narrowband light sources, wherein (a) the peak wavelength of said red narrowband light source is within 590˜

    750 nm, and the full width half maximum thereof is smaller than 80 nm;

    (b) the peak wavelength of said green narrowband light source is within 500˜

    560 nm, and the full width half maximum thereof is smaller than 80 nm;

    (c) the peak wavelength of said blue narrowband light source is within 400˜

    480 nm, and the full width half maximum thereof is smaller than 80 nm; and

    a color filter matched with said backlight source, said color filter being disposed between said two transparent substrates and above said semi-reflective layer, said color filter being composed at least of red, green, and blue color pieces, wherein (a) the red color piece being formed of a material having a transmitive spectrum having an average transmittance of at least 80% at the red color wavelength region and an average transmittance of Rr for other visible light wavelengths with 15%<

    Rr<

    80%, and said red color piece selectively absorbs said green and blue narrowband light sources so that the transmittances of said red color piece for said green and blue narrowband light sources will be less than 15%, respectively;

    (b) the green color piece being formed of a material having a transmitive spectrum having an average transmittance of at least 80% at the green color wavelength region and an average transmittance of Rg for other visible light wavelengths with 15%<

    Rg<

    80%, and said green color piece selectively absorbs said red and blue narrowband light sources so that the transmittances of said green color piece for said red and blue narrowband light sources will be less than 15%, respectively; and

    (c) the blue color piece being formed of a material having a transmitive spectrum having an average transmittance at least 80% at the blue color wavelength region and an average transmittance of Rb for other visible light wavelengths with 15%<

    Rb<

    80%, and said blue color piece selectively absorbs said green and red narrowband light sources so that the transmittances of said blue color piece for said green and red narrowband light sources will be less than 15%, respectively.

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