| 摘要 |
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.
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