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US 5,473,396 AGranted
Display apparatus and method of making the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMichio Okajima, Takao Tohda
Life of this patent
Estimating the term…
Abstract
A novel type projection TV has a large size fluorescent screen bearing three kinds of dots or stripes of fluorescent material which emits visible lights of red, green and blue at excitation by UV-rays, which are emitted from UV-emitting CRTs' for red, green and blue pixel of image, respectively; and a mask having UV-light passing apertures or a lens array is disposed on light paths of the UV-rays to improve color purity,
Claims21
A display apparatus comprising:
- an EL apparatus, which is provided for emitting rays of UV image from its light emitting face, and which comprises:
- a UV-emitting layer including a UV-emitting fluorescent material which is to be excited by electric field application,
- a dielectric layer provided on at least one face of said UV-emitting layer, and
- a pair of electrodes which is provided in a manner to oppose each other interposing said UV-emitting layer and said dielectric layer therebetween, at least one of said electrode being transparent or translucent,
- a projection lens system provided on paths of the rays of UV image for projecting a UV image of the light emitting face, and
- a fluorescent screen for emitting visible lights when lit up by the rays of UV image through the projection lens system.
3 more elements
A display apparatus comprising:
- a UV light source for emitting rays of UV image from its light emitting face,
- a projection lens system provided on paths of the rays of UV image for projecting a UV image of the light emitting face,
- a fluorescent screen for emitting visible lights when lit up by the rays of UV image through the projection lens system, and
- three UV light sources disposed substantially on a triangle which is substantially perpendicular to an optical axis of either one of the UV light sources, and
- a lens array comprising a number of lenses disposed in the same direction as that of said UV light source, said lens array provided between said projection lens system and said fluorescent screen.
2 more elements
A display apparatus comprising:
- a UV light source for emitting rays of UV image from its light emitting face,
- a projection lens system provided on paths of the rays of UV image for projecting a UV image of the light emitting face, and
- a fluorescent screen for emitting visible lights when lit up by the rays of UV image through the projection lens system, wherein
- said UV light source is a CRT comprising a UV-emitting fluorescent material which is excited by electron beam bombardment, and wherein
- said UV-emitting fluorescent material is at least one member selected from the group consisting of diamond, silicon, carbide, III-V compound semiconductors, IIb-VI compound semiconductors, IIa-VI compound semiconductors, chalcopyrite compounds and manganese calcogenite compounds.
2 more elements
Method for making fluorescent screen for display apparatus comprising:
- a UV light source which emits rays from a image emitted from its UV light emitting face,
- a projection lens system provided on a path of said UV light for projecting UV rays from image of said light emitting face,
- a fluorescent screen for emitting visible-light when lit up by UV rays through said projection lens system, and
- a mask, which is disposed on said path between said projection lens and said fluorescent screen and passes UV rays which are emitted from said image, the method comprising the steps of:
- disposing a pattern exposing light source at such a position that said UV light source is to be disposed for projecting said UV light image through said projection lens on a desired irradiating region on said fluorescent screen at a given position,
- disposing said mask at such predetermined position as to make a predetermined gap from said fluorescent screen,
- coating a negative photoresist film containing a visible-light-emitting fluorescent material on said fluorescent screen,
- disposing said fluorescent screen at said given position,
- exposing said negative photoresist film to said pattern-exposing light source, and
- developing said photoresist film after said exposing, thereby to obtain a desired pattern of said visible-light-emitting fluorescent material.
7 more elements
Method for making fluorescent screen for display apparatus comprising:
- a UV light source which emits rays from a image emitted from its UV light emitting face,
- a projection lens system provided on a path of said UV light for projecting UV rays from image of said light emitting face,
- a fluorescent screen for emitting visible-light when lit up by UV rays through said projection lens system, and
- a lens array, which is disposed on said path between said projection lens and said fluorescent screen and deflects UV rays, the method comprising the steps of:
- disposing a pattern exposing light source at such a position that said UV light source is to be disposed for projecting said UV light image through said projection lens on a desired irradiating region on said fluorescent screen at a given position,
- disposing said lens array at such predetermined position as to make a predetermined gap from said fluorescent screen,
- coating a negative photoresist film containing a visible-light-emitting fluorescent material on said fluorescent screen,
- disposing said fluorescent screen at said given position,
- exposing said negative photoresist film to said pattern-exposing light source, and
- developing said photoresist film after said exposing, thereby to obtain a desired pattern of said visible-light-emitting fluorescent material.
7 more elements
A display apparatus comprising:
- a UV light source for emitting rays of UV image from its light emitting face,
- a projection lens system provided on paths of the rays of UV image for projecting a UV image of the light emitting face,
- a fluorescent screen for emitting visible lights when lit up by the rays of UV image through the projection lens system, and
- a UV cut filter or UV reflection mirror at a position opposite to said projection lens system with respect to the fluorescent layer of said fluorescent screen.
1 more element
Dependencies are inferred from the claim text.