EPROM package and method of optically erasing

Details EPROM package and method of optically erasing EPROM package and method of optically erasing

1992-05-04

1994-04-05

Mintel, William

Active solid-state devices (e.g., transistors, solid-state diode

Housing or package

With window means

257681, 257787, 359 43, H01L 2302

Patent

active

053008081

ABSTRACT:
An erasable programmable read only memory (EPROM) package whose storage information can be erased by irradiating with light of a certain wavelength. A semiconductor device (34) with an erasable programmable read only memory is mounted on a circuit carrying substrate (30). Synthetic resin (37) covers the semiconductor device and portions of the circuit carrying substrate to provide a package. A window (39) is formed in the resin to expose the erasable-programmable-read-only-memory circuit to light. The window is cross-polarized and normally opaque to the light and transmits the light when appropriately energized to remove the cross polarization. The light is typically in the ultraviolet frequency, and the window may be made from a liquid crystal material or a solid crystal material such as PLZT. Applying a voltage to the window causes the liquid crystal material in the window to become transparent and allow the EPROM to be erased.

REFERENCES:
patent: 3898977 (1975-08-01), Draper
patent: 4126758 (1978-11-01), Krumme
patent: 4641156 (1987-02-01), Ohta et al.
patent: 5063435 (1991-11-01), Okamoto et al.
patent: 5113270 (1992-05-01), Fergason
"Advanced Technology: PLZT Ceramics" by James R. Phillips, Information Display, Apr. 1989.

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