US 2020/0404227 A1 · PROJECTION DEVICE AND PHOTO COUPLER CIRCUIT FOR THE SAME

Abstract

A projection device and a photo coupler circuit for the same are disclosed. The photo coupler circuit includes a logic unit, a number of integration units and a selection unit. The logic unit is configured to receive a number of first control signals and a number of first PWM signals from a main circuit of the projection device, and to output a number of second PWM signals and one or more second control signals according to the first control signals and the first PWM signals. The integration units are coupled to the logic unit. Each of the integration units is configured to generate an integration signal according to one of the second PWM signals. The selection unit is coupled to the integration units to select one of the integration signals to be output to a light source drive circuit of the projection device according to the second control signals.

Claims19

Dependent claims

A photo coupler circuit adapted to a projection device, the photo coupler circuit comprising:

a logic unit configured to receive a plurality of first control signals and a plurality of first pulse width modulation (PWM) signals from a main circuit of the projection device, and to output a plurality of second PWM signals and one or more second control signals according to the first control signals and the first PWM signals;
a plurality of integration units coupled to the logic unit, wherein each of the integration units is configured to generate an integration signal according to one of the second PWM signals;
and
a selection unit coupled to the integration units and configured to select one of the integration signals to be output to a light source drive circuit of the projection device according to the one or more second control signals.

1 more element

A projection device, comprising:

a main circuit;
a photo coupler circuit, comprising:
a logic unit coupled to the main circuit and configured to receive a plurality of first control signals and a plurality of first PWM signals from the main circuit, and to output a plurality of second PWM signals and one or more second control signals according to the first control signals and the first PWM signals;
a plurality of integration units coupled to the logic unit, wherein each of the integration units is configured to generate an integration signal according to one of the second PWM signals;
and
a selection unit coupled to the integration units and configured to select one of the integration signals to be output according to the one or more second control signals;
and
a light source drive circuit coupled to the photo coupler circuit and configured to receive the integration signals output from the photo coupler circuit.

5 more elements

Dependencies are inferred from the claim text.

Projection device and photo coupler circuit for the same

Life of this patent

Projection device and photo coupler circuit for the same

Life of this patent

Abstract

Claims19