Illumination unit and display
AssigneeSony Corporation
InventorKazumasa Kaneda
Life of this patent
Estimating the term…
Abstract
An illumination unit includes: a light source section including a laser light source; an optical-path branching device outputting light incident from the light source section, by branching the light into an outgoing optical path of illumination light and other optical path; a photodetector receiving a light flux that travels on the other optical path; a control section controlling an emitted light quantity in the laser light source, based on a quantity of the light flux received by the photodetector; and a light-quantity-distribution control device disposed between the optical-path branching device and the photodetector on the other optical path, the light-quantity-distribution control device controlling a light quantity distribution in the light flux to be incident upon the photodetector.
Claims15
An illumination unit comprising:
- a light source section including a laser light source;
- an optical-path branching device outputting light incident from the light source section, by branching the light into an outgoing optical path of illumination light and other optical path;
- a photodetector receiving a light flux that travels on the other optical path;
- a control section controlling an emitted light quantity in the laser light source, based on a quantity of the light flux received by the photodetector, by maintaining the emitted light quantity to be substantially constant independent of a temperature change of the laser light source;
- and
- a light-quantity-distribution control device disposed between the optical-path branching device and the photodetector on the other optical path, the light-quantity-distribution control device controlling a light quantity distribution in the light flux to be incident upon the photodetector.
A display including an illumination unit that emits illumination light, and a light modulation device that modulates the illumination light based on an image signal, the illumination unit comprising:
- a light source section including a laser light source;
- an optical-path branching device outputting light incident from the light source section, by branching the light into an outgoing optical path of illumination light and other optical path;
- a photodetector receiving a light flux traveling on the other optical path;
- a control section controlling an emitted light quantity in the laser light source, based on a quantity of the light flux received by the photodetector, by maintaining the emitted light quantity to be substantially constant independent of a temperature change of the laser light source;
- and
- a light-quantity-distribution control device disposed between the optical-path branching device and the photodetector on the other optical path, the light-quantity-distribution control device controlling a light quantity distribution in the light flux to be incident upon the photodetector.
Dependencies are inferred from the claim text.