IC storage and access circuitry for an injection electroluminescent diode display

The design of a monolithic IC that is packaged in a hybrid assembly with a linear array of 32 light-emitting diodes to form a basic building block for LED panel display is discussed. The functions of the IC are buffering, inverting, decoding, driving, controlling, LED current regulation, storage, power gating, and lead reduction. Storage is provided by a two- transistor latch that is fabricated in monolithic form using a lateral p-n-p and vertical n-p-n. The random access time between elements in the array is 180 ns for turn-on and 100 ns for turn-off. The IC inputs are compatible with DTL and T/SUP 2/L input levels and the LED output brightness is adequate for viewing in room light.