Illumination system and projection system adopting the same

An illumination system comprising:

• a light emitting device having an array structure to emit a light beam having a wavelength;
• a holographic optical element to change an optical path of the light beam emitted from the light emitting device;
• a waveguide to receive the light beam from the holographic optical element and to guide the received light beam;
• and
• a prism array to receive the guided light beam from the waveguide and to make parallel the received light beam so that the parallel light beam proceeds in one direction,
• wherein the light emitting device is a light emitting diode (LED), a laser diode, an organic electro luminescent (EL), or a field emission display (FED).

An illumination system comprising:

• a plurality of light emitting devices to emit light beams having different wavelengths;
• a plurality of holographic optical elements, corresponding to the light emitting devices, to change optical paths of the light beams emitted from the light emitting devices;
• and
• a waveguide to guide light beams incident from the holographic optical elements in a same direction,
• an input direction of the light beams into the waveguide being perpendicular to a transmission direction of the light beams through the waveguide and an output direction of the light beams from the waveguide.

An illumination system comprising:

• a plurality of light emitting devices having an array structure to emit light beams having different wavelengths;
• a plurality of holographic optical elements, corresponding to the light emitting devices, to change optical paths of the light beams emitted from the light emitting devices;
• a waveguide to guide light beams incident from the holographic optical elements in a same direction;
• and
• a prism array to receive the guided light beam from the waveguide and to make the light beam parallel so that the parallel light beam proceeds in one direction,
• wherein each of the light emitting devices is a light emitting diode (LED), a laser diode, an organic electro luminescent (EL), or a field emission display (FED).

An illumination system comprising:

• a plurality of light emitting devices to emit light beams having different wavelengths;
• a plurality of holographic optical elements, corresponding to the light emitting devices, to change optical paths of the light beams emitted from the light emitting devices;
• a waveguide to guide light beams incident from the holographic optical elements in a same direction;
• and
• a parallel beam forming unit to make parallel the light beam emitted from each of the light emitting devices,
• wherein each of the light emitting devices is a light emitting diode (LED), a laser diode, an organic electro luminescent (EL), or a field emission display (FED) and the holographic optical element is arranged at a first or second end portion of the waveguide.

An illumination system comprising:

• a light emitting device to emit a light beam having different wavelengths;
• a focusing lens to condense the light beam emitted from the light emitting device;
• and
• a waveguide having an inclined incident surface, upon which the condensed light is incident,
• an input direction of the light beam into the waveguide being perpendicular to a transmission direction of the light beam through the waveguide and an output direction of the light beam from the waveguide.

An illumination system comprising:

• a light emitting device to emit a light beam having different wavelengths;
• a focusing lens to condense the light beam emitted from the light emitting device;
• and
• a waveguide having an inclined incident surface, upon which the condensed light is incident,
• wherein the light emitting device has an array structure.

An illumination system comprising:

• a plurality of light emitting devices to emit a plurality of light beams having different wavelengths;
• a diffractive optical element to change an optical path of the light beams emitted from the light emitting devices;
• and
• a waveguide to guide the light beams which have passed through the diffractive optical element,
• an input direction of the light beams into the waveguide being perpendicular to a transmission direction of the light beams through the waveguide and an output direction of the light beams from the waveguide.

An illumination system comprising:

• a plurality of light emitting devices to emit a plurality of light beams having different wavelengths;
• a diffractive optical element to change an optical path of the light beams emitted from the light emitting devices;
• a waveguide to guide the light beams which have passed through the diffractive optical element;
• and
• a prism array to receive the guided light beams from the waveguide to make parallel the received light beams so that the parallel light beams proceed in one direction,
• wherein the light emitting devices have an array structure, and the light emitting devices are a light emitting diode (LED), a laser diode, an organic electro luminescent (EL), or a field emission display (FED).

A projection system comprising:

• a plurality of light emitting devices to emit a plurality of light beams having different wavelengths;
• a holographic optical element to change a proceeding path of the light beams emitted from the light emitting devices;
• a waveguide to guide the light beams passing through the holographic optical element,
• an input direction of the light beams into the waveguide being perpendicular to a transmission direction of the light beams through the waveguide and an output direction of the light beams from the waveguide;
• a display device to form an image by processing the light beams passing through the waveguide according to an input image signal;
• a screen;
• and
• a projection lens unit to magnify the image formed by the display device and to project the magnified image toward the screen.

A projection system comprising:

• a plurality of light emitting devices to emit a plurality of light beams having different wavelengths;
• a holographic optical element to change a proceeding path of the light beams emitted from the light emitting devices;
• a waveguide to guide the light beams passing through the holographic optical element;
• a display device to form an image by processing the light beams passing through the waveguide according to an input image signal;
• a screen;
• a projection lens unit to magnify the image formed by the display device and to project the magnified image toward the screen;
• and
• a prism array to receive the guided light beams from the waveguide and to make parallel the received light beams,
• wherein the light emitting devices have an array structure, and the light emitting devices are a light emitting diode (LED), a laser diode, an organic electro luminescent (EL), or a field emission display (FED).

A projection system comprising:

• a plurality of light emitting devices to emit a plurality of light beams having different wavelengths;
• a focusing lens to condense the light beams emitted from the light emitting devices;
• a waveguide having an inclined surface upon which the condensed light is incident;
• a display device to form an image by processing the light beams passing through the waveguide according to an input image signal;
• a screen;
• and
• a projection lens unit to magnify the image formed by the display device and to project the magnified image toward a screen,
• an input direction of the light beams into the waveguide being perpendicular to a transmission direction of the light beams through the waveguide and an output direction of the light beams from the waveguide.

A projection system comprising:

• a plurality of light emitting devices to emit a plurality of light beams having different wavelengths;
• a focusing lens to condense the light beams emitted from the light emitting devices;
• a waveguide having an inclined surface upon which the condensed light is incident;
• a display device to form an image by processing the light beams passing through the waveguide according to an input image signal;
• a screen;
• a projection lens unit to magnify the image formed by the display device and to project the magnified image toward a screen;
• and
• a first parallel beam forming unit to make parallel the light beams emitted from the light emitting devices,
• wherein the light emitting devices have an array structure, and the light emitting devices are a light emitting diode (LED), a laser diode, an organic electro luminescent (EL), or a field emission display (FED).

A projection system comprising:

• a plurality of light emitting devices to emit light beams having different wavelengths;
• a plurality of holographic optical elements to change respective proceeding paths of the light beams emitted from the light emitting devices;
• a waveguide to guide the light beams input through the holographic optical elements to proceed in a same direction;
• a display device to form an image by processing the light beam passing through the waveguide according to an input image signal;
• a screen;
• and
• a projection lens unit to magnify the image formed by the display device and to project the magnified image towards the screen,
• an input direction of the light beams into the waveguide being perpendicular to a transmission direction of the light beams through the waveguide and an output direction of the light beams from the waveguide.

A projection system comprising:

• a plurality of light emitting devices to emit light beams having different wavelengths;
• a plurality of holographic optical elements to change respective proceeding paths of the light beams emitted from the light emitting devices;
• a waveguide to guide the light beams input through the holographic optical elements to proceed in a same direction;
• a display device to form an image by processing the light beam passing through the waveguide according to an input image signal;
• a screen;
• a projection lens unit to magnify the image formed by the display device and to project the magnified image towards the screen;
• and
• a prism array to receive the guided light beam from the waveguide and to make parallel the received light beam,
• wherein the light emitting device has an array structure, and the light emitting device is a light emitting diode (LED), a laser diode, an organic electro luminescent (EL), or a field emission display (FED).

An illumination system comprising:

• a light emitting device to emit a light beam having a wavelength;
• a light receiving element to reduce a cross section of the light beam emitted from the light emitting device;
• and
• a waveguide to receive the reduced light beam from the light receiving element and to guide the received light beam,
• an input direction of the light beam into the waveguide being perpendicular to a transmission direction of the light beam through the waveguide and an output direction of the light beam from the waveguide.

An illumination system comprising:

• a light emitting device to emit a light beam having a wavelength;
• a light receiving element to reduce a cross section of the light beam emitted from the light emitting device;
• a waveguide to receive the reduced light beam from the light receiving element and to guide the received light beam;
• and
• a prism to receive the guided light beam from the waveguide and to make parallel the received light beam so that the parallel light beam proceeds in one direction.