Laser light source device, video display device

A deterioration determination method determining deterioration of a laser light source device used for a video display device which displays video by using plural image frame data inputted from an image generation device, comprising:

• supplying power for driving the laser light source device;
• acquiring a target light amount which is a light amount necessary for displaying the image frame data;
• acquiring an output light amount of the laser light source device;
• controlling a drive circuit which supplies power for driving the laser light source device so that the output light amount will be the target light amount;
• and
• determining deterioration of the laser light source device by using drive conditions of the drive circuit with respect to at least two different target light amounts at the time of control.

A control method performed by a video display device which displays video by using the laser light source device, comprising:

• acquiring the maximum light amount which can be outputted by the laser light source device in accordance with the deteriorated state of the laser light source device;
• acquiring plural image frame data from an image generating unit;
• calculating a target light amount which is a light amount necessary for displaying the image frame data by using the acquired maximum light amount;
• and
• controlling output of the laser light source device by using the calculated target light amount.