Projection display system using laser light source

A projection apparatus, comprising:

• a laser light source for emitting an illumination light with adjustable light intensities and as pulsed emissions;
• a mirror device comprising mirror elements, each includes a mirror for reflecting the illumination light emitted from the laser light source and an elastic hinge for supporting the mirror on a device substrate;
• a package for containing and protecting the mirror device;
• and
• a projection lens having a depth of focus for projecting and focusing the reflected light reflected from the mirror device on an image display surface, wherein
• the package comprises a transparent cover glass covering over the mirror device and disposed between the mirror device and the projection lens;
• and
• the distance between the bottom surface of the cover glass facing the mirror device and a top surface of the mirror of the mirror device is larger than the depth of focus of the projection lens and at least ten to one-hundred times of a size of the micromirror wherein the projection lens is disposed above the cover glass opposite the mirror device.

A projection apparatus, comprising:

• a light source for emitting an illumination light;
• a device substrate for supporting a mirror device wherein the mirror device comprising mirror elements, each includes a mirror for reflecting and modulating the illumination light fore projecting a modulated light to a projection lens having a depth of focus for projecting and focusing the modulated light on an image display surface to display an image;
• a glass cover covers the mirror device and disposed between the mirror and the projection lens wherein
• a distance between a top surface of the mirror and the bottom surface of the glass cover facing the mirror device is smaller than the depth of focus of the projection lens and at least ten to one-hundred times of a size of the micromirror wherein the projection lens is disposed above the cover glass opposite the mirror device.