The display based on up-conversion of near infrared light is a novel display. To improve the screen luminance and avoid leakage of infrared light, two multilayer interference filters are designed on the screen of the display. One is called the LP filter, having low transmittance for visible light between 400 and 800 nm, and high transmittance for infrared light between 800 and 1000 nm; the other is called the SP filter with opposite characteristics to those of the LP filter. Layer-symmetric films are used to design the filters and the conjugate gradient method is used to optimize the design. The LP and SP filters obtained have good characteristics within the whole wavelength bandwidth between 400 and 1000 nm and the incident angle range 0-20. The manufacturing tolerances on film thickness and refractive index are reasonably large.

We designed an edge-lighting light guide plate (LGP) based on a micro-prism structure for liquid crystal display. Its top and bottom surfaces have micro-prisms, and a layer of high reflection film is coated on the bottom surface. The principle of the LGP was analyzed. The optical simulation tool ASAP was used to calculate the apex angle and height of the micro-prism on the top of the LGP, the apex angle of the micro-prism on the bottom of the LGP and the emitting angle dependent luminous flux of the LGP. By adjusting the width of micro-prisms on the bottom, the LGP achieved uniform luminance. A 12-in LGP based on a micro-prism structure as an example was designed. The results proved that the LGP based on a micro-prism structure is thin and simple with uniform luminance and high efficiency.

aumstereoscopic 3D projector using several 2D projectors, a projection screen, and two parallax barriers is proposed. Parallax barrier 1 facing the 2D projectors collimates the images that have aberrations on the edge of the projection screen. Parallax barrier 2 facing viewers acts as the parallax barrier in ordinary au-tostereoscopic 3D displays. The operation principle of the system, the calculation equations for the parallax barriers, and the capture and correction of parallax images are described in detail. A 60-inch autostereo-scopic 3D projector prototype having four 2D projectors was developed. The presentation of 3D static, ani-marion, and video images is realized by the prototype. The prototype's stereoscopic images without aberra-tions and with a little cross talk are sharp. Especially, its 3D resolution is the same as its 2D resolution.

An achromatic quarter-wave film using one twisted-nematic liquid-crystal (TNLC) cell, a chromatic half-wave plate, and a chromatic quarter-wave plate is presented. The Jones matrix is used to calculate the optical properties of the system. An optimal algorithm is used for optimizing the configuration parameters. Simulation results indicate that the designed configuration is capable of turning a linearly polarized light into perfectly circularly polarized light in the wavelength range 400-700 nm. The manufacturing tolerance of the cell gap and twisted angle of the TNLC are good.

A broadband polarization switch consisting of an active twisted nematic liquid crystal cell and two passive uniaxial compensation films is analysed. The conjugate gradient method was used for optimizing the device parameters. Simulation results indicate that the polarization switch exhibits a broad bandwidth and high contrast ratio. The manufacturing tolerances on cell gap, twist angle and compensation films thickness are reasonably large.