Minoru Miyatake

Investigation of Anisotropic Scattering Films with Unique Functions Such as Light Scattering Polarizer

Abstract We have succeeded in making an optical film whose scattering intensity depends on the polarization direction of incident light. We evaluate and discuss the optical properties of this film based on the results of optical simulation.

36.3: Analysis of Depolarized Light-Scattering in LCD Panel and Proposal of LCD Systems for Enhancing Contrast Ratio

We have successfully measured depolarized light-scattering in LCD panel by using the measuring system with collimated light source. Depolarized light-scatterings in VA (vertical alignment)-mode panel have interesting scattering behaviors. We propose systems for enhancing contrast ratio by applying the above result.

Extraction of waveguided light by anisotropic scattering polarizer in OLED for LCD backlights

An approach to increase the coupling-out efficiency of organic light-emitting diodes (OLEDs) was studied. The approach, especially, is suitable for liquid crystal display (LCD) backlight applications. We demonstrated that the anisotropic scattering polarizer (ASP) laminated to the glass substrate surface increased the optical efficiency of OLED for LCD backlight applications. The ASP was properly prepared by drawing the liquid crystal polymer (LCP) dispersed poly(carbonate) film. The ASP could extract the emitted light trapped in substrate of OLED involved in polarization selectivity. The light extraction ability and the polarization selectivity were changed by the thickness of electron transporting layer (ETL) of OLED. The optical efficiency for 60 nm ETL thickness device through absorbing polarizer was not improved significantly by the lamination of ASP. Alternatively, the low efficiency of 120 nm ETL thickness device was effectively improved by the lamination of ASP, which was due to the extraction of waveguided light as a substantially polarized emission. Although the degree of increase for 120 nm ETL thickness device by the lamination of ASP was substantially large, the final optical efficiency was less than or comparable to that for 60 nm ETL thickness device. However, in the case of 90 nm ETL thickness device, the lamination of ASP increased the optical efficiency by the factor of 1.2-1.3 against 60 nm ETL thickness device.

17.3: Control of the Refractive Index and the Birefringence of Side‐Chain Liquid Crystalline Copolymers

The refractive index(no) and the birefringence(Δn) of side-chain liquid-crystalline copolymers (LCPs) are investigated. Introduction of the second fragment to a cyanobiphenyl derivative unit conducted LCPs to a wide range of optical properties. This technology is expected to be usable on a variety of optical devices.