Light source device for display device, display device, and method for adjusting image of display device

A light source device for a display device for projecting an image on a screen, the screen including a front and a rear, the front being the same side as a viewing side and the rear being a side opposite the viewing side, the light source device comprising:

• a light source unit operable to output light;
• an image outputting unit operable to output an image by supplying an image signal to the light;
• and
• a control circuit operable to switch the image output from the image outputting unit between a normal image and a mirror reversed image formed by reversing the normal image right and left by controlling the image signal, such that an outputting type is capable of being switched between a front projection in which the image is projected onto the screen from the front, and a rear projection in which the image is projected onto the screen from the rear,
• wherein the control circuit switches projecting light output according to a projection type between front projection and rear projection;
• wherein the light source unit includes a semiconductor laser;
• and
• wherein the control circuit switches the projecting light output according to surrounding brightness.