Retardation matching using the liquid crystal twist angle for different color dots within a pixel of a reflective color LCD

A reflective color liquid crystal display device comprising at least one pixel, each pixel comprising a red dot, a green dot, and a blue dot, each dot comprising:

• a first substrate having an inner face;
• a second substrate having an inner face facing said first substrate inner face, and an outer face;
• a liquid crystal layer interposed between said first and second substrates;
• a reflective layer formed on the inner face of said first substrate;
• a color filter layer interposed between said reflective layer and said second substrate;
• a polarizer disposed over the outer face of said second substrate;
• and
• a retardation element disposed over the outer face of said second substrate or interposed between said reflective layer and said second substrate;
• wherein said reflective color liquid crystal display device satisfies:
• 0.9≦((α*dR*ΔnR+ReR)/λR)/((α*dG×ΔnG+ReG)/λG)≦1.1 (Formula 3);
• 0.9≦((α*dB*ΔnB+ReB)/λB)/((α*dG×ΔnG+ReG)/λG)≦1.1 (Formula 4);
• and
• where,
• dR, dG, and dB=thicknesses of the liquid crystal layer for each of said red dot, green dot, and blue dot, respectively;
• λR, λG, and λB=wavelengths of visible light passing through each of said red dot, green dot, and blue dot, respectively;
• ΔnR, ΔnG, and ΔnB=refractive index anisotropies of the liquid crystal layer for each of said red dot, green dot, and blue dot, respectively, when said wavelengths of visible light are λR, λG, and λB, respectively;
• ReR, ReG, and ReB=retardations of said retardation element when said wavelengths of visible light are λR, λG, and λB, respectively;
• and
• α=a twist coefficient dependent on a molecular liquid crystal twisting angle.