Projection display and illuminating optical system for it
AssigneeSeiko Epson Corporation
InventorsYoshitaka Itoh, Toshiaki Hashizume
Life of this patent
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Abstract
An apparatus which makes dark lines due to a central axis of a cross dichroic prism sufficiently inconspicuous. In a second lens array, minute lenses arranged on the same column include three different types of minute lenses having optical axes at different positions. Each row of the minute lenses consists of one of the three types of minute lenses. Partial light fluxes respectively passing through the minute lenses have optical axes at different positions relative to a center of a lighting area of a liquid-crystal light bulb, so as to illuminate different illumination areas.
Claims36
A lighting optical system for emitting light for use in a projection display apparatus comprising:
- colored light separation means which separates the light into three colored rays;
- three light modulation means which respectively modulate the three colored rays based on given image signals;
- colored light combining means which has two dichroic films arranged in an X shape and a central axis corresponding to a position where the two dichroic films cross each other, the colored light combining means combining the three colored rays respectively modulated by the three light modulation means to composite light and outputting the composite light in a common direction;
- and a projection means which projects the composite light output from the colored light combining means on a projection surface, the lighting optical system comprising:
- a dividing and superposing optical system that divides a light flux into a plurality of partial light fluxes, which are arranged in directions of columns and rows, and superposes the plurality of partial light fluxes, the columns being substantially parallel to the central axis of the colored light combining means, the rows being substantially perpendicular to the direction of columns,
- wherein the dividing and superposing optical system is constructed to shift, in the direction of rows, an illumination area on each light modulation means illuminated with part of the partial light fluxes among the partial light fluxes on an identical column from an illumination area illuminated with the other partial light fluxes among the partial light fluxes on the identical column.
A projection display apparatus projector, comprising:
- a lighting optical system which emits light;
- colored light separation means which separates the light into three colored rays;
- three light modulation means which respectively modulate the three colored rays based on given image signals;
- colored light combining means which has two dichroic films arranged in an X shape and a central axis corresponding to a position where the two dichroic films cross each other, the colored light combining means combining the three colored rays respectively modulated by the three light modulation means to composite light and outputting the composite light in a common direction;
- and
- projection means which projects the composite light output from the colored light combining means on a projection surface,
- wherein the lighting optical system comprises a dividing and superposing optical system that divides a light flux into a plurality of partial light fluxes, which are arranged in directions of columns and rows, and superposes the plurality of partial light fluxes, the columns being substantially parallel to the central axis of the colored light combining means, the rows being substantially perpendicular to the direction of columns, and
- wherein the dividing and superposing optical system is constructed to shift, in the direction of rows, an illumination area on each light modulation means illuminated with part of the partial light fluxes among the partial light fluxes located on a same column from an illumination area illuminated with the other partial light fluxes among the partial light fluxes located on the identical column.
A lighting optical system for emitting light for use in a projector comprising a colored light separation system which separates the light into three colored rays, three light modulation devices which respectively modulate the three colored rays based on given image signals, a colored light combining system which has two dichroic films arranged in an X shape and a central axis corresponding to a position where the two dichroic films cross each other, the colored light combining system combining the three colored rays respectively modulated by the three light modulation devices to composite light and outputting the composite light in a common direction, and a projection lens which projects the composite light output from the colored light combining system on a projection surface, the lighting optical system comprising:
- a dividing and superposing optical system that divides a light flux into a plurality of partial light fluxes, which are arranged in directions of columns and rows, and superposes the plurality of partial light fluxes, the columns being substantially parallel to the central axis of the colored light combining system, the rows being substantially perpendicular to the direction of columns,
- wherein the dividing and superposing optical system is constructed to shift, in the direction of rows, an illumination area on each light modulation device illuminated with part of the partial light fluxes among the partial light fluxes on an identical column from an illumination area illuminated with the other partial light fluxes among the partial light fluxes on the identical column.
A projector, comprising:
- a lighting optical system which emits light;
- a colored light separation system which separates the light into three colored rays;
- three light modulation devices which respectively modulate the three colored rays based on given image signals;
- a colored light combining system which has two dichroic films arranged in an X shape and a central axis corresponding to a position where the two dichroic films cross each other, the colored light combining system combining the three colored rays respectively modulated by the three light modulation devices to composite light and outputting the composite light in a common direction;
- and
- a projection lens which projects the composite light output from the colored light combining system on a projection surface,
- wherein the lighting optical system comprises a dividing and superposing optical system that divides a light flux into a plurality of partial light fluxes, which are arranged in directions of columns and rows, and superposes the plurality of partial light fluxes, the columns being substantially parallel to the central axis of the colored light combining system, the rows being substantially perpendicular to the direction of columns, and
- wherein the dividing and superposing optical system is constructed to shift, in the direction of rows, an illumination area on each light modulation device illuminated with part of the partial light fluxes among the partial light fluxes located on a same column from an illumination area illuminated with the other partial light fluxes among the partial light fluxes located on the identical column.
Dependencies are inferred from the claim text.