Indicating instrument for vehicle

Details Indicating instrument for vehicle Indicating instrument for vehicle

2007-11-20

2007-11-20

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C340S815550, C340S815570, C362S489000

Reexamination Certificate

active

11377218

ABSTRACT:
An indicating instrument for a vehicle has a display board, a light modulation member disposed to cover a surface of the display board. An illumination intensity of the display board is detected by a light detecting member and a control unit applies to a dc pulse voltage to the light modulation member, to thereby control a light transmissivity of the light modulation member according to the illumination intensity. When the illumination intensity is higher than a predetermined level, the voltage is applied in one direction so that the light modulation member changes from a colorless condition to a colored condition to restrict an external light from reflecting on the display board. When the illumination intensity is lower than a predetermined level, the voltage is applied in a reverse direction so that the light modulation member is transferred from the colored condition to the colorless condition to maintain the visibility of the display board.

REFERENCES:
patent: 6750779 (2004-06-01), Wada et al.
patent: 6886970 (2005-05-01), Wada et al.
patent: 2003/0043049 (2003-03-01), Wada et al.
patent: 2-234857 (1990-09-01), None
patent: 2848512 (1998-11-01), None

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