Tsuyoshi Kashiwagi

Color reflection holography using four recording wavelengths

We present a theoretical analysis of color reflection holography using four recording wavelengths. The color reproduction of the hologram is discussed using the 1976 CIE chromaticity diagram. The optimum combination of the four wavelengths which minimizes the distance between the reconstructed image and the object points is calculated using nonlinear least square method. It is found that the extremely good color reproduction can be achieved by four- wavelength recording. We also analyze the color reproduction for the four practical laser wavelengths. The optimum choice of the wavelengths and the attainable color reproduction are discussed.

50.4: Invited Paper: Rear Projection Screen with Improved Wider Vertical Viewing Angle

We developed a new rear projection screen compriseding of two total internal reflecting prism sheets laminated to each other in a 90 degree angle. The advantages of this screen are not only wider vertical viewing angle, but improved black level, the uniformity of color temperature, reduced scintillation, and reduced ghost images.