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Light Scanner with High Isolation

IP.com Disclosure Number: IPCOM000080182D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 40K

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Light scanner 10 has high electrical isolation characteristics between its transparent matrix conductors.

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Light Scanner with High Isolation

Light scanner 10 has high electrical isolation characteristics between its transparent matrix conductors.

Light scanner 10 has a storage material with bidirectional voltage addressing properties such as ferroelectric plate 1, which is sandwiched between transparent X and Y matrix conductors. By applying appropriate one-half selecting voltages to the appropriate X and Y conductors, light is passed by layer 1 at the intersection of the two selected energized X and Y conductors. Electrical isolation is provided between the nonselected intersections.

To improve the electrical isolation between the X conductors and Y conductors, the conductors' capacitance to ground is increased. This is accomplished, for example, by depositing transparent dielectric layers 2 completely on the top of the X and Y conductors.

Each of the dielectric layers 2 is covered by a suitable transparent ground conductor 3. Further electrical isolation is provided by depositing decoupling capacitors, not shown at the end of each X and Y conductor.

The isolation characteristics of scanner 10 are further enhanced by using low-impedance drivers, not shown. In addition, electronic switches, not shown, with high-impedance characteristics when open and low-impedance characteristics when closed, are used to couple the drivers to the X and Y lines. Further improvement is obtained by using short time clocking pulses, i.e., driver signals.


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