P-n junction scanning device having photo-conductors disposed on device with field effect layers for controlling position of scanning spot

Claim 2

A two-dimensional scanning apparatus comprising A pair of scanning devices each constructed according to claim 2, wherein the output wires of one of said devices are extended to form a first series of parallel grid wires, and the output wires of the other of said devices are extended to form a second series of parallel grid wires at an angle to said first series of parallel grid wires.

Claim 3

A two-dimensional scanning apparatus as defined in claim 3, wherein said angle is of the order of 90* .

Claim 4

Apparatus as defined in claim 3, additionally including a plane electroluminescent layer interposed between and in contact with the first series of grid wires and the second series of grid wires.

Claim 5

Apparatus as defined in claim 4, additionally including a plane electroluminescent layer interposed between and in contact with the first series of grid wire and the second series of grid wires.

Claim 6

A device as defined in claim 1, wherein the said first and second semiconductor layers are chosen such that the junction formed by the two said layers can lase.

Claim 7

A junction device as defined in claim 1, having a terminal at each end of the resistive layer and at each end of the outer semiconductor layer.

Claim 8

A junction device as defined in claim 8, additionally comprising a first voltage source having its positive terminal connected to one terminal of the outer semiconductor layer; a second voltage source having it negative terminal connected to that terminal of the resistive layer at the same end of the junction device as the said one terminal of the outer semiconductor layer; a variable voltage source having its positive terminal connected to the other terminal of the resistive layer and to the positive terminal of the second voltage source; a variable current source having its negative terminal connected to the conducting layer; a bias voltage producing means having its positive terminal connected to the other terminal of the outer semiconductor layer and its negative terminal connected to the negative terminal of the variable voltage source, the negative terminal of the first voltage source, and the positive terminal of the current source; whereby the position of the light spot is determined by the voltage applied by the variable voltage source and the brightness of the spot is determined by the current generated by the current source.

Claim 9

A scanning device comprising a current indicating device according to claim 9, a plurality of regularly spaced photoconductors mounted on said device, a plurality of lead wires each connected to a discrete one of the said photoconductors, and a plurality of output wires each emanating from a discrete one of said photoconductors.

Claim 10

A two-dimensional scanning apparatus comprising a pair of scanning devices each constructed according to claim 10, wherein the output of one of said devices are extended to form a first series of parallel grid wires, and the output wires of the other of said devices are extended to form a second series of parallel grid wires at right angles to said first series of parallel grid wires.

Claim 11

A two-dimensional scanning apparatus as defined in claim 11, wherein said angle is of the order of 90*.

Claim 12

Apparatus as defined in claim 11, additionally including a plane electroluminescent layer interposed between and in contact with the first series of grid wires and the second series of grid wires.

Claim 13

Apparatus as defined in claim 12, additionally including a plane electroluminescent layer interposed between and in contact with the first series of grid wires and the second series of grid wires.

Claim 14

A device as defined in claim 9, wherein the said first and second semiconductor layers are chosen such that the junction formed by the two said layers can lase.

Claim 15

A light-emitting semiconductor junction device comprising: a conducting layer; an outer semiconductor layer; a sandwich semiconductor layer sandwiched between the conducting layer and the outer semiconductor layer and of opposite conductivity to the outer semiconductor layer and Forming a junction with the outer semiconductor layer; said layers being selected so that current flow through the junction causes emission of light; an insulating layer in contact with the sandwich semiconductor layer; a photovoltaic layer in contact with the insulating layer and separated from the sandwich semiconductor layer by the insulating layer and creating a field effect in the sandwich semiconductor layer in response to a voltage applied across the ends of the photovoltaic layer thereby to restrict the area of emission of light from the junction device to a spot of light.

Claim 16

A junction device as defined in claim 8, additionally comprising a first voltage source having its positive terminal connected to one terminal of the outer semiconductor layer; a second voltage source having its negative terminal connected to that terminal of the resistive layer at the same end of the junction device as the said one terminal of the outer semiconductor layer; a variable voltage source having its positive terminal connected to the other terminal of the resistive layer and to the positive terminal of the second voltage source; a variable current source having its negative terminal connected to the conducting layer; a diode having its positive terminal connected to the other terminal of the outer semiconductor layer and its negative terminal connected to the negative terminal of the variable voltage source, the negative terminal of the first voltage source, and the positive terminal of the current source; whereby the position of the light spot is determined by the voltage applied by the variable voltage source and the brightness of the spot is determined by the current generated by the current source.