Optical waveguide plate for display

• Main Authors: NANATAKI TSUTOMU, TAKEUCHI YUKIHISA
• Format: Patent
• Language: English
• Published: 25.09.2001
• Edition: 7
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; BLASTING; CRYPTOGRAPHY; DISPLAY; DISPLAYING; EDUCATION; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LABELS OR NAME-PLATES; LIGHTING; MECHANICAL ENGINEERING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SEALS; SIGNS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; WEAPONS

An optical waveguide plate for a display including a main optical waveguide plate body for introducing light from a light source thereinto, and surface-smoothing materials formed on both surfaces of the main optical waveguide plate body and having approximately the same optical refractive index as that of an optical waveguide plate. The main optical waveguide plate body is composed of a transparent material such as glass and acrylic resin, because it is necessary to totally reflect the introduced light. The surface-smoothing material is composed of, for example, a liquid having good wettability with respect to the main optical waveguide plate body. The range, in which the optical refractive index of the surface-smoothing material is approximately the same as the optical refractive index of the main optical waveguide plate body, lies in 0.8n<=m<=1.2n provided that the optical refractive index of the surface-smoothing material is m, and the optical refractive index of the main optical waveguide plate body is n. It is possible to decrease the plane roughness on the surface of the main optical waveguide plate body, substantially eliminate scratches, dirt and the like, and improve the contrast and brightness of the display.