Abstract: A display device for realizing gray-scale display by changing an amplitude of a modulation voltage which is output from a data-side driving circuit. A driving control circuit is capable of supplying a first display data signal representing (m+n) grades, obtained by adding m grades represented by a second display data signal externally input and an adjustable range n. The data-side driving circuit is capable of outputting modulation voltages having (m+n) types of amplitudes to a plurality of first electrodes in accordance with a first display data signal. The amplitude of the modulation voltage corresponding to the light emission characteristic of a prescribed light emitting layer among a plurality of light emitting layers is adjusted to an amplitude in the adjustable range n from the amplitude corresponding to the grade represented by the second display data signal.

Abstract: A method of manufacturing an optic transmission module assures a high reliability for the module by inspecting the character of a low bit error rate (BER) of the module quickly and accurately. The module is employed in an optical communication system (light transmission system) required to cope with information communication systems that are becoming faster and faster in operation and larger and larger in capacity. Also disclosed is a system and a method for inspection of the BER character which uses a rectangular wave pulse as an interference light to calculate a degradation quantity of a signal-to-noise ratio (S/N) on the basis of a simple theory, thereby inspecting the BER character by extrapolating a case in which there is no interference light (S/X=∞ or X=0) with use of a sign error rate theoretical value according to a bit error rate of a light signal measured according to the degradation quantity.

Abstract: A display device for realizing gray-scale display by changing an amplitude of a modulation voltage which is output from a data-side driving circuit. A driving control circuit is capable of supplying a first display data signal representing (m+n) grades, obtained by adding m grades represented by a second display data signal externally input and an adjustable range n. The data-side driving circuit is capable of outputting modulation voltages having (m+n) types of amplitudes to a plurality of first electrodes in accordance with a first display data signal. The amplitude of the modulation voltage corresponding to the light emission characteristic of a prescribed light emitting layer among a plurality of light emitting layers is adjusted to an amplitude in the adjustable range n from the amplitude corresponding to the grade represented by the second display data signal.

Abstract: While modules to be tested in one constant temperature oven are tested by providing a plurality of constant temperature ovens, accommodating a plurality of modules to be tested in each constant temperature oven and connecting the modules to be tested accommodated in a plurality of constant temperature ovens to the measuring instruments via the switches, preparation for testing such as temperature change of the other constant temperature oven is conducted and the modules to be tested in one constant temperature oven are tested using measuring instruments. Thereafter, the switches are changed over and the modules to be tested accommodated in the other constant temperature oven are tested. Thereby, expensive measuring instruments can be used effectively.