Industrial Technology Research Institute

Yi-Jen Tsou

Fang-Chuan Ho

Cheng-Wei Chu

Fang Chuan Ho

Shih-Ping Lee

Jinn-Chou Yoo

Rong-Ho Lee

Han-Chung Wang

Tomy Cheng

A field sequential dichroic light valve using ferro-electric liquid crystal components and multi-layer thin film broadband polarizing beam-splitting devices as an optical switch. The field sequential dichroic light valve has a fast time response and a memory function, as well as a switch frequency larger than 180 Hz and an optical transmittance larger than 90%. Accordingly, the field sequential dichroic light valve can effectively switch R, G, B-colored light beams in time sequence, and can be applied to a full-color projection display system.

Field sequential dichroic light valve

A thermal transfer color-variable ribbon is disclosed, the color appearance of which depends on the variation of viewing angle, which includes a substrate, a releasing agent formed on the substrate, a functional coating, which can be a multilayer thin-film stack of reflection mode or transmission mode, formed on the releasing agent, and an adhering layer formed on the functional coating. The functional coating is designed based on the general theory that describes the thin-film interference phenomena. The functional coating can be formed by alternately stacking dielectrics having high and low refractive indices or dielectric and metal layers. The construction parameters of the all-dielectric stack and the metal/dielectric stack can be chosen in similar way to how parameters are chosen when manufacturing selective band-pass filters, which are designed based on the thin-film interference theory. The color appearance of the printed document, either in reflection mode or in transmission mode, can be selected and optimized as for the filter design. The effect of varying incident angle on color appearance of the functional coating in either mode can also be optimized during the design. Furthermore, the functional coating can be a inhomogeneous thin-film. The refractive index of the inhomogeneous thin film is varied along the growth direction.

Thermal transfer color-variable ribbons for peripheral printers

A thin-film multilayer system for use in a head-up display is provided, which comprises: A substrate; a plurality of dielectric layers having a high refractive index sequentially formed on the substrate; and a plurality of dielectric layers having a low refractive index formed alternately with the plurality of dielectric layers having a high refractive index. The thickness and ingredient of each of the plurality of dielectric layers having a high refractive index and the plurality of dielectric layers having a low refractive index are determined according to interference theory for all-dielectric thin-film multilayers to make the thin-film multilayer system able to polarize light and to display images in true color. Further, the ingredients of the thin-film multilayer system are dielectric materials that can endure wear and tear, chemicals, and environmental injuries. The thin-film multilayer system can be directly formed on the windshield of a vehicle, otherwise it can be formed on a substrate made of glass or plastic, and then adhered to the windshield.

Thin-film multilayer systems for use in a head-up display

A multilayer thin-film broad-band polarizing beam-splitter which can split an unpolarized beam into two orthogonal linearly polarized beams with high extinction ratios is provided. The fabrication method comprises: (1) selecting a right-angle prism, having an isosceles triangular cutoff plane; (2) depositing broad-band polarized multilayer thin-film on an internal slope of the right-angle prism; (3) cementing and UV-curing a coated right-angle prism with an uncoated right-angle prism to form a cube-shaped polarizing beam-splitter; (4) properly determining the orientation of the polarization plane of the cube-shaped polarizing beam-splitter; (5) identifying the multi-stage assembly designs that are responsible for beam being incident and emerging; (6) adding anti-reflecting coatings to the relevant faces of the cube-shaped polarizing beam-splitters; and (7) cementing and UV-curing these cube-shaped polarizing beam-splitters.

Multilayer thin-film broad-band polarizing beam-splitter

A thin-film color-selective beam splitter and the method of fabricating the same are disclosed. The method includes the steps of: (i) forming a main prism by a pre-selected material, and deciding a first base angle and a second base angle according to the substance and coating characteristics of the pre-selected material; (ii) coating a first multilayer film and a second multilayer film on two slopes of the main prism, in which tilt angles for coating the first multilayer film and the second multilayer film and tilt angles of light entering and emerging the main prism are different, so that spectra of the first multilayer film and the second multilayer film are different, and the first multilayer film can be a red reflective film and the second multilayer film can be a blue reflective film; and (iii) using the pre-selected material to form interface prisms, and adhering the interface prisms to the main prism, so that light can perpendicularly enter and emerge from surfaces of the prism. Moreover, the method may include a further step of: coating a filtering film on an emerging interface of the main prism for green light. A thin-film color-selective beam splitter can be formed by the above method with a single coating process and can serve as a tri-color beam splitter.

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Taipei, Taiwan

Yi-Jen Tsou