Method for making display device

Abstract

An alpha-numeric display device having a modular structure for placement side-by-side in vertical and horizontal formats to present symbols, words and phrases. The device functions as a stand-alone peripheral, appearing to a controller, such as a microprocessing device, as a random access memory. In particular, the device is operative to receive a standarized 7-bit ASCII code and to translate it to a multiple segment display whereby it can be continuously presented. The device provides a small, relatively low-cost alphabet and number display with a built-in electronic interface to a microprocessing unit permitting word communication to be incorporated into compact equipment, such as hand-held terminals and portable display devices. Complex interface circuitry is compactly packaged in a modular device by utilization of hybrid integrated circuit technology in which a multiple layer substrate provides interconnection between display units and semiconductor integrated circuit chips on opposing sides of the substrate. A multiple step PTF silkscreen printing process permits construction of a two-sided, compact display device with extremely thin, high resolution printed interconnections. The critical steps are the partial curing of a first application PTF dielectric composition followed by a second accurate application of PTF composition and subsequent curing thereof.

Dependencies are inferred from the claim text.