US 9,813,682 B2
Laser driving circuit, laser driving method, and device using laser light
Motoi Kimura, Kanagawa (JP); and Tsutomu Kurihara, Tokyo (JP)
Assigned to Sony Corporation, Tokyo (JP)
Filed by Sony Corporation, Tokyo (JP)
Filed on Nov. 10, 2016, as Appl. No. 15/348,587.
Application 15/348,587 is a continuation of application No. 14/349,592, granted, now 9,516,258, previously published as PCT/JP2012/075785, filed on Oct. 4, 2012.
Claims priority of application No. 2011-233729 (JP), filed on Oct. 25, 2011; and application No. 2012-078917 (JP), filed on Mar. 30, 2012.
Prior Publication US 2017/0064265 A1, Mar. 2, 2017
Int. Cl. H04N 9/31 (2006.01); G02B 27/48 (2006.01); H01S 5/042 (2006.01); H01S 5/065 (2006.01); H01S 5/40 (2006.01); H04N 5/74 (2006.01); H01S 5/062 (2006.01); G09G 3/02 (2006.01)
CPC H04N 9/3135 (2013.01) [G02B 27/48 (2013.01); H01S 5/0427 (2013.01); H01S 5/0652 (2013.01); H01S 5/06213 (2013.01); H01S 5/4093 (2013.01); H04N 5/74 (2013.01); H04N 9/3129 (2013.01); H04N 9/3161 (2013.01); H04N 9/3179 (2013.01); G09G 3/02 (2013.01); G09G 2320/0233 (2013.01); H01S 5/06216 (2013.01); H01S 2301/02 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A projection apparatus comprising:
an optical circuit including a light source unit;
a signal processing circuit configured to generate an input video signal; and
a laser driving circuit including:
a laser driving video current generating circuit for generating a laser driving current for driving the light source unit;
a high-frequency superimposing section configured to superimpose a high-frequency signal of a frequency exceeding a band of the input video signal on the laser driving current generated by the laser driving video current generating circuit; and
a receiver in the high-frequency superimposing section, the receiver is configured to receive a clock signal input from an outside of the laser driving circuit in a state of being synchronized with the input video signal as a signal source of the high-frequency signal,
wherein a frequency of the high-frequency signal is synchronized with a pixel period.