Display apparatus
AssigneeCanon Kabushiki Kaisha
InventorsAtsushi Okuyama, Hiroyuki Kodama
Life of this patent
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Abstract
A display apparatus of the type which forms a color image by modulating a plurality of lights different from each other in color by one or more display elements, includes a device for changing the color purity of at least one light by inserting or extracting a wavelength selection element into or out of the optical path of at least one of the plurality of lights, or changing the attitude of the wavelength selection element, and a device for supplying information as to whether the wavelength selection element is in the optical path of the at least one color light or information on the attitude of the wavelength selection element in the optical path of the at least one color light.
Claims13
A display apparatus of the type which forms a color image by modulating a plurality of lights, different from each other in color, by one or more display elements, said display apparatus comprising:
- means for obtaining a plurality of different kinds of display modes by changing the color purity of at least one light of the plurality of lights;
- means for supplying information representing the plurality of different kinds of display modes,
- wherein said means for supplying information supplies said information in response to turning on an electrical source of said display apparatus.
A display apparatus of the type which forms a color image by modulating a plurality of lights, different from each other in color, by one or more display elements, said display apparatus comprising:
- means for exchanging a display mode with priority on purity and a display mode with priority on brightness by changing the color purity of at least one light of the plurality of lights;
- means for displaying whether the display mode of said display apparatus is said display mode with priority on brightness in response to power-on of said display apparatus.
A display apparatus of the type which forms a color image by modulating a plurality of lights, different from each other in color, by one or more display elements, said display apparatus comprising:
- means for changing the color purity of at least one light of the plurality of lights by inserting or extracting a wavelength selection element into or out of the optical path of the at least one light or changing the attitude of said wavelength selection element disposed in the optical path of the at least one light;
- and
- means for supplying information as to whether said wavelength selection element is in the optical path of the at least one light or information on the attitude of said wavelength selection element in the optical path of the at least one light in response to turning on an electrical source of said display apparatus.
A projection type display apparatus comprising:
- image display elements;
- a light source for illuminating said image display elements;
- at least one first optical element for color-separating the light from said light source into at least two color lights and causing them to impinge upon said image display elements;
- at least one second optical element for synthesizing the lights output from said image display elements into one;
- a lens for projecting the light from said at least one second optical element in an enlarged state;
- a third optical element which can be inserted into or removed from the optical path between said at least one first optical element and said at least one second optical element, said third optical element having characteristics of transmitting visible light of a wavelength longer than a predetermined wavelength and blocking visible light of a wavelength shorter than that or of transmitting visible light of a wavelength shorter than a predetermined wavelength and blocking visible light of a wavelength longer than that;
- and
- means for supplying information as to whether said third optical element is in the optical path in response to turning on the electric source of said projection type display apparatus.
Dependencies are inferred from the claim text.