Patent ID: 7551247

Claim:
A reflection-type display device comprising: an active switch layer including a plurality of switching elements; a plurality of pixel electrodes each connected to a corresponding one of the plurality of switching elements; a reflective layer formed between the active switch layer and the plurality of pixel electrodes; a modulation layer provided at a side of the pixel electrodes facing a viewer, the modulation layer being capable of switching between a first state and a second state of respectively different optical characteristics, wherein the reflective layer is connected to neither the plurality of switching elements nor the plurality of pixel electrodes, and wherein the reflective layer has retroreflection characteristics and includes a two-dimensional array of a plurality of unit features comprising cubic corner cubes; and wherein each pixel electrode has a substantially rectangular planar shape, and the relationships Dr (S) <=(√3)/3× P cc Dr (L) <=(√3)/3× P cc ((√3)/6 ×P pix(L) ×P cc +P pix(S) ×P cc /2)/( P pix(L) ×P pix(S) )>0.005 are satisfied, where Dr (S) is a gap width between the pixel electrodes along a direction S of shorter sides thereof, Dr (L) is a gap width between the pixel electrodes along a direction L of longer sides thereof, P cc is a pitch of the cubic corner cubes: P pix(S) is a pitch of the pixel electrodes along the direction S; and P pix(L) is a pitch of the pixel electrodes along the direction L.