Optics: image projectors – Lamp control
Patent
1994-03-29
1996-10-22
Dowling, William
Optics: image projectors
Lamp control
353122, G03B 2114
Patent
active
055670300
ABSTRACT:
A start-up device for automatically controlling picture size in an LCD projector during a warm-up period of a lighting source of the projector, the device including: a power detector for detecting whether power to the projector has been turned on or off; a size initializing device for initializing the picture size output by the projector to a minimum value when power is turned on; a growing device, responsive to the initializing means, for gradually increasing the picture size from the minimum size to a predetermined size, during a warm-up period. The start-up device also includes: a brightness initializing device for initially setting one or both of a picture brightness and a picture contrast to a maximum level when power is turned on; and a dimming device, responsive to the growing device, for changing the brightness and/or the contrast from the maximum level to a predetermined level, the change being completed so as to be commensurate in time with the picture size being increased to the predetermined size. The start-up device further includes: a shrinking device for gradually decreasing the picture size from the predetermined size to the minimum size when power is turned off; and a termination device, responsive to the shrinking means, for terminating projection of the picture when the minimum picture size has been attained.
REFERENCES:
patent: 4961087 (1990-10-01), Gaudiniet et al.
patent: 4964719 (1990-10-01), Tachikawa et al.
patent: 5136397 (1992-08-01), Miyashita
patent: 5379083 (1995-01-01), Tomita
Dowling William
Goldstar Co. Ltd.
LandOfFree
Method for controlling picture size in an LCD projector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for controlling picture size in an LCD projector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for controlling picture size in an LCD projector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2353892