Abstract An improved halftone charge-controlled viewing storage tube which uses the field-effect principle is described. The tube is characterized as having as its face plate a panel comprising a light transparent support plate, a light transparent conductive coating on one side of such support plate a first electroluminescent material layer disposed over the conductive coating and a layer of a uniform mixture of a second electroluminescent material and a photoconductor is disposed over the first electroluminescent layer. The first electroluminescent material is selected to emit light in the visible range of the electromagnetic spectrum, while the second electroluminescent material is sealed to emit light in the near ultraviolet region of the electromagnetic spectrum. Large panels 12 X 12 inches and larger can be used to give sharp clear images. Additionally, high writing speed is obtained in the storage tube. Information can be stored or can be disposed without being stored. Also, the storage tube is capable of providing long viewing times.
An improved viewing storage tube according to claim 1 in which the conductive layer is a light transparent conductive film contiguous with the surface of the support member.
Claim 2
Dependent Claim
38 words
An improved viewing storage tube according to claim 1 wherein said first electroluminescent material emits light in the visible region of the electromagnetic spectrum and said second electroluminescent emits light in the near ultraviolet region of electromagnetic spectrum.
Claim 3
Dependent Claim
58 words
An improved viewing storage tube according to claim 1 which also includes: means for producing a writing beam of high-velocity electrons and moving said writing beam across said image storage layer to form an electron image thereon; and means for flooding said image storage layer with low velocity electrons to erase an image stored in said storage layer.
Claim 4
Dependent Claim
133 words
An improved viewing storage tube having a field-effect conductivity control including combined direct viewing storage target and electroluminescent screen, comprising: a. a support member of light transparent insulating material; b. a screen of a first electroluminescent material supported on one side of said light transparent support member; c. a layer of a second electroluminescent material contiguous with said screen, said second electroluminescent material having a light emission different from said first electroluminescent material; d. a photoconductive layer contiguous with said layer of said second electroluminescent material, said photoconductive layer being receptive to and capable of storing an image electronically imposed thereon; and e. a conductive layer supported on one side of said support member to establish an electric field, in the presence of an AC potential, across said screen and said photoconductive layer.
Claim 5
Dependent Claim
28 words
An improved viewing storage tube according to claim 5 in which the conductive layer is a light transparent conductive film contiguous with the surface of said support member.
Claim 6
Dependent Claim
40 words
An improved viewing storage tube according to claim 5 wherein said first electroluminescent material emits light in the visible region of the electromagnetic spectrum and said second electroluminescent material emits light in the near ultraviolet region of the electromagnetic spectrum.
Claim 7
Dependent Claim
58 words
An improved viewing storage tube according to claim 5 which also includes: means for producing a writing beam of high-velocity electrons and moving said writing beam across said image storage layer to form an electron image thereon; and means for flooding said image storage layer with low-velocity electrons to erase an image stored in said image storage layer.