LUMINESCENT SCREEN AND ITS MANUFACTURING PROCESS Russian patent published in 2002 - IPC

FIELD: engineering physics. SUBSTANCE: luminescent screen has phosphor layer 1 covered with layer 2 for heating movable charge carriers; insulating layer 4; group of contacts 8; adhesive layer 3 disposed between layer 4 and layer 2. Layer 4 and adhesive layer 3 have plurality of through holes 5 and 6. Each hole 5 in layer 4 is contracting towards adhesive layer 3 and passes coaxially to respective layer hole 6 in adhesive layer 3. Each group of contacts 8 is, essentially, electricity conducting layer of limited area which covers layer 4 including walls of holes 5 in this layer, as well as walls of holes 6 in adhesive layer 3 and naked sections on surface of layer 2 that function as bottom of holes 6 in adhesive layer 3. In this way point contacts 8 are formed on mentioned sections. Groups of contacts 8 are interconnected in parallel. Layer 2 possesses high resistance relative to mentioned phosphor layer 1 and its thickness equals length of charge-carrier free path in this layer. Thickness of adhesive layer 3 does not exceed diameter of hole 6 in this layer 3. Screen manufacturing process includes formation of phosphor layer 1, layer 2 for heating movable charge carriers, insulating layer 4, and also separate groups of contacts 8. Layer 8 is formed on surface of phosphor layer 1. Adhesive layer 3 is applied to surface of layer 2. Insulating film is formed to producing layer 4, contracting through holes 5 are formed in this film, the latter is brought in contact with adhesive layer 3. Holes 6 are made in adhesive layer 3 through holes 6. Electricity conducting layer is formed on surface of layer 4 including walls of holes 5 in this layer 4 and also on walls of holes 6 in adhesive layer 3 and on naked sections of layer 2. Groups of contacts 8 are formed by using lithographic method on electricity conducting layer. Proposed screen is used for manufacturing large- area light-emitting devices. EFFECT: enhanced speed at low operating current due to reduced stray capacitance of structure; enhanced luminous efficiency. 21 cl, 3 dwg