Reflection-type liquid crystal display device and fabrication process thereof
View Patent ↗A reflection-type liquid crystal display device includes a first substrate, a second substrate facing the first substrate and carrying projections and depressions, a reflective electrode on the second substrate so as to cover the projections and depressions and in electrical contact with a switching device provided on the second substrate via a contact hole, and a negative liquid crystal layer between the first and second substrates, wherein the contact hole is disposed centrally to the reflection electrode and a structure controlling alignment of liquid crystal molecules in the liquid crystal layer is disposed so as to overlap the contact hole viewed in a direction perpendicular to the second substrate.
1. A reflection-transmission-type liquid crystal display device, comprising:
a first substrate;
a second substrate provided so as to face said first substrate;
a transparent electrode provided on a surface of said first substrate facing said second substrate;
a reflection electrode provided on a surface of said second substrate facing said first substrate, said reflection electrode having an opening;
a scattering layer provided between said first and second substrates, said scattering layer including therein a liquid crystal layer and changing an optical state thereof between a scattering state and a non-scattering state; and
a pair of polarizers disposed at outer sides of a liquid crystal panel formed by said first substrate, said second substrate and said scattering layer,
at least one of said polarizers is formed of a circular polarizer.
2. A reflection-transmission-type liquid crystal display device as claimed in claim 1 , wherein each of said pair of polarizers is formed of a circular polarizer.
3. A reflection-transmission-type liquid crystal display device as claimed in claim 1 , wherein one of said pair of polarizers is a linear polarizer.
4. A reflection-transmission-type liquid crystal display device as claimed in claim 1 , wherein said scattering layer has a retardation of (0.5n+¼)λ, where λ is the wavelength of visible light and n is a natural number in said non-scattering state thereof.
5. A reflection-transmission-type liquid crystal display device as claimed in claim 1 , wherein said scattering layer has an in-plane retardation in said non-scattering state thereof such that said in-plane retardation is smaller than a product Δn·d, where Δn is the birefringence of a liquid crystal layer constituting said scattering layer and d is the thickness of said liquid crystal layer.
6. A reflection-transmission-type liquid crystal display device as claimed in claim 1 , wherein said reflection electrode has a slit shape.
7. A reflection-transmission-type liquid crystal display device as claimed in claim 1 , wherein any of said first and second substrates carries a color filter, said color filter having a reflection region corresponding to said reflection electrode and a transmission region corresponding to said transmission region, said color filter having different color purities in said reflection region and in said transmission region.
8. A reflection-transmission-type liquid crystal display device as claimed in claim 7 , wherein said color filter is provided on said reflection electrode.