Patent ID: 7748884

Claim:
An optical display device, comprising: at least two illuminants have different peak wavelengths; a light guiding plate including (1) a display portion and (2) a peripheral portion with an incidence surface facing said illuminants, said light guiding plate receiving light from the illuminants through the incidence surface and mixing said light with one another to result in white light, said light guiding plate further directing the white light to said display portion; and a light detecting sensor which detects the white display light thereby enabling control of emission of said light from said illuminants, wherein, said light detecting sensor and said at least two or more illuminants are commonly mounted on a wiring board with said illuminants being disposed so light emitting surfaces thereof to face said light incidence surface of said light guiding plate, said light detecting sensor is disposed on the same side of said wiring board as said illuminants with respect to said light guiding plate so as to receive white light from the light guiding plate, said light detecting sensor is mounted on said wiring board so that a light receiving portion thereof is located in an inside with respect to said light emitting surfaces of said two or more illuminants, and said light guiding plate includes a light guiding protrusion portion which protrudes from said peripheral portion to an inside of said wiring board.