Title:
PHASE PLATE HAVING LAMINATION STRUCTURE AND LIQUID CRYSTAL DISPLAY ELEMENT USING SAME
Document Type and Number:
Japanese Patent JPH02130522
Kind Code:
A
Abstract:
PURPOSE:To obtain uniform refractive index anisotropy to large area by constituting the phase plate by laminating drawn plastic films which have refractive index anisotropy in a film surface so that a main optical axis having a large refractive index between two optical main axis directions in each film surface is mutually parallel. CONSTITUTION:The phase plate 1 is constituted by laminating the drawn plastic films 1a-1c which have small retardation. Then, those films 1a-1c are laminated so that the main axis X(X1, X2, X3) in the direction where the refractive index is large between the optical main axes (X1, X2, X3) and Y(Y1, Y2, Y3) (where nX is the X-directional refractive index and nY is the Y-directional refractive index and nX is larger than nY. Thermoplastic high polymer films of polycarbon ate, polystyrene, etc., in addition to polyvinyl alcohol and cellulose triacetate are usable as films 1a-1c. Further, the films may be made of a mixture of them. Consequently, the refractive index anisotropy is uniformed to large area.
Inventors:
TAKIGUCHI YASUYUKI
Application Number:
JP28415988A
Publication Date:
May 18, 1990
Filing Date:
November 10, 1988
Export Citation:
Assignee:
RICOH KK
International Classes:
G02B5/30; G02F1/133; G02F1/1335; (IPC1-7): G02B5/30; G02F1/133; G02F1/1335
Domestic Patent References:
| JPS63167304A | 1988-07-11 |
Attorney, Agent or Firm:
Toshiaki Ikeura (1 outside)