US Patent No. 11,032,880

LIGHT EMISSION CONTROL DEVICE, LIGHT SOURCE DEVICE, AND PROJECTION-TYPE VIDEO DISPLAY APPARATUS


Patent No. 11,032,880
Issue Date June 08, 2021
Title Light Emission Control Device, Light Source Device, And Projection-type Video Display Apparatus
Inventorship Atsushi Yamada, Nagoya (JP)
Assignee SEIKO EPSON CORPORATION, Tokyo (JP)

Claim of US Patent No. 11,032,880

1. A light emission control device for controlling a switching element of a light source circuit, the light source circuit including a resistor, a light emission element, the switching element, and an inductor provided in series between a first power node and a second power node, the device comprising:a first power supply circuit that supplies a first power supply voltage based on an input power;
a second power supply circuit that supplies a second power supply voltage based on the input power;
a control circuit that is operated by the second power supply voltage and outputs a control signal for controlling turning on/off of the switching element;
a drive circuit that is operated by the first power supply voltage and outputs a drive signal for driving the switching element based on the control signal; and
a start control circuit, wherein
the start control circuit outputs a start control signal for delaying a timing at which an output of the drive signal is started after the input power is turned on.