OPTICAL SYSTEM OF COLOR IMAGE DISPLAY DEVICE

• Main Authors: MAENO KEIICHI, NAKAGAKI SHINTARO, TAKAHASHI RIYUUSAKU, NEGISHI ICHIRO, SUZUKI TETSUJI, TATSUMI FUJIKO, TAKANASHI RYOYU
• Format: Patent
• Language: English
• Published: 18.12.1991
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PURPOSE:To obtain the color image display device which is small in size by using a tri-color separation prism, which is used for the tri-color separation of read light, even as a tri-color componsing prism. CONSTITUTION:One prism is used as the tri-color separating prism SCA which generate read light beams RL of respective colors to be made incident on three reflection type spatial optical modulating elements SLMr, SLMg. and SLMb and the tri-color composing prism which composes light of optically modulated read light beams of the respective colors projected by the three spatial optical modulating elements SLMr, SLMg, and SLMb. The length of the optical path to a screen, therefore, becomes short as compared with conventional methods which perform tri-color separation and tri-color composition by using a dichroic mirror of large capacity in a space. Consequently, the constitution of the color display device is reducible in size.