Image display devices
AssigneeNEC Corporation
InventorHiroshi Imai
Life of this patent
Estimating the term…
Abstract
An image display device may include a varifocal optical element that condenses a light beam emitted from a light source and scans a projection surface with the light beam from the varifocal optical element. The varifocal optical element may include lenses located side by side in a direction orthogonal to their optical axes that are in parallel with each other; an orthogonal plane mirror that reflects the beam that passes through one of the lens to the other lens; and an actuator that moves the orthogonal plane mirror in parallel along the optical axes of the lenses. The displacement of the actuator may be controlled based on the scanning angle.
Claims11
An image display device, comprising:
- an optical element that condenses a light beam and has a variable focal length, wherein the optical element comprises
- a first lens and a second lens that have optical axes parallel to each other, wherein said first and second lenses are located side by side in a direction orthogonal to said optical axes,
- a reflector that receives said light beam through said first lens and reflects the light beam to said second lens, and
- at least one actuator that moves at least one of said reflector, said first lens, and said second lens in a direction parallel to said optical axes;
- a scanner that scans a projection surface with said light beam condensed by said optical element;
- and
- a controller that controls said scanner based on a video signal to display an image on said projection surface, controls said focal length of said optical element based on a scanning angle of said scanner, and controls said at least one actuator to change the focal length of said optical element.
Dependencies are inferred from the claim text.