Display illumination device with light sensor

1. 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.

2. The optical display device according to claim 1 , wherein said light detecting sensor is a side view type light detecting sensor having a light receiving portion positioned on a face intersecting perpendicularly with respect to a mounting surface of said wiring board, and said light receiving portion receives the white display light which leaks through an end face of said light guiding protrusion portion.

3. The optical display device according to claim 2 , further comprising a reflecting wall facing said light guiding protrusion portion of said light guiding plate.

4. The optical display device according to claim 1 , wherein said light detecting sensor is a top view type light detecting sensor having a light receiving portion provided on a surface facing a mounting surface of said wiring board, and said light receiving portion receives the white display light which leaks through a first principal surface, facing said light receiving portion, of said light guiding protrusion portion.

5. The optical display device according to claim 4 , wherein said light guiding protrusion portion has a second principal surface which inclined relative to said first principle surface and is a total reflection inclined surface such that it reflects the white display light to the said first principal surface.

6. The optical display device according to claim 5 , wherein said first principle surface includes a roughened surface.

7. The optical display device according to claim 6 , further comprising a reflecting sheet facing said second principal surface.

8. The optical display device according to claim 7 , wherein said reflecting sheet piece is constructed in a form of a reflecting protrusion piece portion which is formed integrally with a portion of a reflecting sheet facing said light incidence portion of said light guiding plate so as to face said light guiding protrusion portion, said reflecting sheet being provided on the second principal surface side facing said first principal surface of said light guiding plate facing said display portion.

9. The optical display device according to claim 8 , further comprising a reflecting wall facing said light guiding protrusion portion.