US 9,813,683 B2
Light source control apparatus, image display apparatus and light source control method
Kiyohiro Oka, Kanagawa (JP); and Wataru Makino, Aichi (JP)
Assigned to SONY CORPORATION, Tokyo (JP)
Filed by Kiyohiro Oka, Kanagawa (JP); and Wataru Makino, Aichi (JP)
Filed on Sep. 11, 2012, as Appl. No. 13/610,251.
Claims priority of application No. 2011-200077 (JP), filed on Sep. 14, 2011.
Prior Publication US 2013/0063500 A1, Mar. 14, 2013
Int. Cl. H04N 9/31 (2006.01); G09G 3/34 (2006.01)
CPC H04N 9/3155 (2013.01) 6 Claims
OG exemplary drawing
 
1. A light source control apparatus for a projector that projects viewable images, comprising:
an image change determination unit that determines presence or absence of an image signal; and
a light source controller that (i) controls a light source of the projector to emit light at a particular luminous output for a predetermined time even in the absence of the image signal, the light source emitting light at a respective luminous output corresponding to a particular one of a plurality of output modes selected by a user, (ii) reduces at a predetermined linear rate equal to 5 W/s or less, when a first output mode is selected, the luminous output of the light source in the absence of the image signal following the predetermined time such that the reduction in the luminous output is not discerned by observers of the projected image, (iii) maintains, when a second output mode is selected, the particular luminous output of the light source corresponding to the second output mode in the absence of the image signal for more than the predetermined time, and (iv) restores the reduced luminous output of the light source to the respective luminous output corresponding to the first output mode for the case that the image signal is input.