Projection display system with diffractive linear display device

A mode selection optical system for use in a projection display system, comprising:

• a grating that:
• selectively permits a first set of modes of light diffracted from a diffractive linear display device of the projection display system to be transmitted through the mode selection optical system;
• and
• selectively filters out a second set of modes of the light diffracted from the diffractive linear display device;
• and
• a lens that collects the first set of modes of light that have been permitted to be transmitted by the grating.

In a projection display system that includes a diffractive linear display device and a mode selection optical system, a method for forming a projected image using the projection display system, comprising:

• in response to an electrical signal that encodes an image, operating the diffractive linear display device to modulate a luminous intensity of a linear light generated by a light source by selectively diffracting the linear light;
• at the mode selection optical system, receiving the diffracted light from the diffractive linear display device, including multiple diffracted light modes, such that:
• the mode selection optical system selectively transmits a first set of the multiple diffracted light modes;
• and
• the mode selection optical system selectively filters out a second set of the multiple diffracted light modes;
• and
• propagating the selectively transmitted first set of the multiple diffracted light modes so as to form a projected image.