Back to results
US 6,211,932 B1Granted
Fresnel lens and liquid crystal display device
AssigneeFujitsu Limited
InventorsYukio Iigahama, Motohiko Fukuhara
Life of this patent
Estimating the term…
Abstract
A display device including liquid crystal display panels, arrays of convergently transmissive elements for forming an erect and real image, and fresnel lenses for magnifying the image. The configured surface of the fresnel lens is arranged on the light incident side. The configured surface includes periodic ridges with flat crests and inclined surfaces. Shading layers are provided on the flat crests to eliminate ghosts.
Claims26
A display device comprising:
- at least one image modulator;
- an imaging device receiving light from said at least one image modulator for forming an erect and real image;
- a fresnel lens including a body having a flat surface and a configured surface with periodic ridges, the fresnel lens being arranged so that light is made incident from the imaging device to the configured surface of the fresnel lens;
- a screen receiving light from said at least one image modulator via the imaging device and the fresnel lens;
- and
- wherein an angle (AEP) of light emerging from an outermost portion of the fresnel lens relative to a line normal to the fresnel lens is in a range of between approximately 13 and 40 degrees.
3 more elements
A display device comprising:
- at least one image modulator;
- an optical lens for magnifying an image output by said at least one image modulator;
- and
- a screen for receiving an image from said at least one image modulator via said optical lens;
- wherein the screen has a predetermined display area, and said at least one image modulator has a main display area and a peripheral compensating area arranged such that the main display area forms an image on the predetermined display area via said optical lens and the peripheral compensating area forms an image just outside the predetermined display area via said optical lens.
2 more elements
A display device comprising:
- at least one image modulator;
- an imaging device receiving light from said at least one image modulator for forming an erect and real image;
- a fresnel lens including a body having a flat surface on one side thereof and a configured surface on the opposite side thereof, said configured surface having periodic ridges, wherein each of the ridges includes a flat crest extending generally parallel to the flat surface and at least one inclined surface extending from the flat crest toward the crest of each of the ridges, and the fresnel lens being arranged so that light is made incident from the imaging device to the configured surface of the fresnel lens, further wherein the flat crests have varying widths depending on the positions of the ridges;
- and
- a screen receiving light from said at least one image modulator via the imaging device and the fresnel lens.
2 more elements
A display device comprising:
- at least one image modulator;
- an imaging device receiving light from said at least one image modulator for forming an erect and real image;
- a fresnel lens including a body having a flat surface and a configured surface with periodic ridges, the fresnel lens being arranged so that light is made incident from the imaging device to the configured surface of the fresnel lens;
- and
- a screen receiving light from said at least one image modulator via the imaging device and the fresnel lens and wherein the screen has a predetermined display area, and said at least one image modulator has a main display area and a peripheral compensating area arranged such that the main display area forms an image on the predetermined display area via the imaging device and the fresnel lens and the peripheral compensating area forms an image just outside the predetermined display area via the imaging device and the fresnel lens.
2 more elements
Dependencies are inferred from the claim text.