| US 7,551,247 B2 | ||
| Reflection type display device and method with pixel electrodes having predetermined dimensions and relationships to each other as to gap width therebetween on both short and long sides and pitch of cubic corner cubes | ||
| Sayuri Fujiwara, Nara (Japan); Yutaka Sawayama, Nabari (Japan); Kiyoshi Minoura, Nara (Japan); and Makoto Kanbe, Sakurai (Japan) | ||
| Assigned to Sharp Kabushiki Kaisha, Osaka (Japan) | ||
| Filed on Jun. 06, 2005, as Appl. No. 11/145,226. | ||
| Claims priority of application No. 2004-171530 (JP), filed on Jun. 09, 2004. | ||
| Prior Publication US 2005/0275773 A1, Dec. 15, 2005 | ||
| Int. Cl. G02F 1/1335 (2006.01) | ||
| U.S. Cl. 349—113 | 13 Claims |
| 1. 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×Pcc
Dr(L)<=(√3)/3×Pcc
((√3)/6×Ppix(L)×Pcc+Ppix(S)×Pcc/2)/(Ppix(L)×Ppix(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, Pcc is a pitch of the cubic corner cubes: Ppix(S) is a pitch of the pixel electrodes along the direction S; and Ppix(L) is a pitch of the pixel electrodes along the direction L.
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