Denso Corporation

Nippondenso Co., Ltd.

Kiyoshi Saeki

Masahiko Osada

Hideki Saito

Hiroyuki Kishita

Tomoya Uchida

Toshinori Ninoyu

Tukasa Koumura

An EL display in which expansion of dielectric breakdown occurring at any one of EL elements is inhibited. Scan electrodes are arranged to receive an offset voltage Vm at those instances other than during application of a scanning voltage thereto in a positive field, while a predetermined voltage is applied to data electrodes to prevent voltage from being applied to EL elements immediately after application of the scan voltage. Accordingly, even where dielectric breakdown occurs at any one of the EL elements due to application of a light emission driving pulse voltage, it is possible to inhibit current flow between the scan electrodes and the data electrodes to thereby inhibit further subsequent dielectric breakdown.

EL display device with dielectric breakdown inhibiting feature

In order to perform micromachining of a precision smooth curved surface on a workpiece, light emitted from a mercury lamp is transmitted through a photomask, Fourier transform lens, aperture material, and inverse Fourier transform lens, after which it is beamed upon the workpiece material to be surface-machined and a positive photoresist layer which is formed on the surface of the workpiece material. By means of the foregoing structure, the high-frequency optical components which are included in the light emitted from the mercury lamp and which may cause roughening of curved-surface machining are made to converge at a location away from the optical axis and are removed by means of an aperture provided thereupon, with the only the residual low-frequency optical components being transmitted through the aperture, and so the intensity profile of the light which is beamed upon the positive photoresist layer is smoothed and a smooth-surface curved surface is transcribed to the positive photoresist layer.

Methods and apparatus for processing curved surface

Growing community of inventors

Okazaki, Japan

Kiyoshi Saeki