Title:
【発明の名称】投写型表示装置
Document Type and Number:
Japanese Patent JPH068985
Kind Code:
B2
Abstract:
PURPOSE:To prevent the lowering of a light utilizing efficiency and the lowering of uniformities of a color and a brightness in a projected image when an effective band is made into a narrow band by sufficiently widening the effective band to red, green and blue lights of a light synthesizing means in comparison with the band of each color light made incident efficiently synthesizing lights emitted from respective light valves. CONSTITUTION:The spectral characteristic of a prism type dichroic mirror to compose a light synthesizing means 46 is set optimum, the polarizing directions of the lights emitted from light valves 43-45 are properly selected, and the cut-off wavelengths of respective multilayer films 51-54 of the light synthesizing means 46 are sufficiently separated from the bands of the lights emitted from respective light valves 43-45 of the red, green and blue. Consequently, respective color lights can be efficiently synthesized into one, and the deterioration of the picture quality of the projected image can be reduced. Thus, a projection type display can be obtained in which the uniformities of the brightness and color of the projected image are satisfactory and, moreover, a light output is large.
Inventors:
MASUMOTO YOSHIHIRO
MYATAKE YOSHITO
MYATAKE YOSHITO
Application Number:
JP13325988A
Publication Date:
February 02, 1994
Filing Date:
May 31, 1988
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G09F9/00; G03B21/00; H04N9/31; (IPC1-7): G09F9/00; G03B21/00
Domestic Patent References:
| JPS6259919A |
Attorney, Agent or Firm:
Akira Kobiji (2 outside)