Liquid crystal display and electronic appliance
View Patent ↗The present invention provides a liquid crystal display that can provide a display with high contrast in both the transmissive mode display and the reflective mode display as a transflective liquid crystal display, and an electronic appliance provided therewith. The liquid crystal display can include a liquid crystal layer of a nematic liquid crystal with positive anisotropy of dielectric constant held between a pair of substrates in accordance with the present invention is characterized in that areas used for the display in the liquid crystal layer includes individual areas having at least two kinds of different liquid crystal layer thickness, the individual areas of different liquid crystal layer thickness are either a reflective display unit or a transmissive display unit, a reflective means is disposed on the reflective display unit, and a transparent resin layer is formed in a portion except a portion corresponding to the transmissive display unit.
1. A liquid crystal display, comprising:
a liquid crystal layer of a nematic liquid crystal with positive anisotropy of dielectric constant held between a pair of substrates, areas used for the display in the liquid crystal layer further comprise individual areas including at least a reflective display unit having a reflective surface disposed thereon and a transmissive display unit, the thickness, dh, of the liquid crystal layer corresponding to the reflective display unit being smaller than the thickness, dt, of the liquid crystal layer corresponding to the transmissive display unit, dh and dt satisfying the equation 1.8 dh≦dt≦2.4 dh, recessed portions facing the liquid crystal layer of the transmissive display unit being formed on the other substrate facing the substrate having said reflective surface, and the thickness of the liquid crystal layer corresponding to the reflective display unit being smaller than the thickness of the liquid crystal layer corresponding to the transmissive display unit.
2. The liquid crystal display according to claim 1 , wherein 1.8 Δndh≦Δndt≦2.4 Δndh is satisfied, where Δn is the anisotropy of refractive index of a nematic liquid crystal constituting the liquid crystal layers, Δndh is the product of the anisotropy of refractive index by the thickness dh of the liquid crystal layer of the reflective display unit, and Δndt is the product of the anisotropy of refractive index by the thickness of the liquid crystal layer of the transmissive display unit.
3. An electronic appliance having a liquid crystal device according to claim 1 on a display unit.