Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Eiichi Munetsugu

Hiroshi Ushiki

Kiyoshi Hidaka

Hirofumi Saita

An integrated circuit of this invention includes a processor, a first circuit for generating a clock signal, and a second circuit for selecting a suitable line voltage. The first circuit generates at least two kinds of clock signals. When one kind of clock signal having a high frequency is selected for use, the processor gives an instruction to the second circuit so as to change the connection between external batteries, and so, to obtain a high line voltage. On the contrary, when the other kind of clock signal having a low frequency is selected for use, said processor gives an instruction to the second circuit so as to change the connection between the batteries, and so, to obtain a low line voltage.

Integrated circuit having software controllable internal clock generator

The pixel drive output terminals of an integrated circuit for liquid crystal display are grouped into two array-portions, one of the array-portions including odd numbered output terminals associated with the odd numbered pixels and the other of array-portions including even numbered output terminals associated with the even numbered pixels.

Integrated circuit for liquid crystal display

A dot-matrix display apparatus comprising a display panel and two integrated circuits. The panel has a number of column electrodes extending vertically and parallel to one another, and a number of row electrodes extending horizontally and parallel to one another. Two TAB films are secured to the upper and lower edges of the panel. The integrated circuits are mounted on these TAB films, respectively. The first integrated circuit distributes odd-numbered ones of pixel data items simultaneously to the odd-numbered column electrodes, whereas the second integrated circuit distributes the even-numbered pixel data simultaneously to the even-numbered column electrodes. Either integrated circuit has an interface circuit and a control circuit, which cooperate to select the odd-numbered pixel data items or the even-numbered pixel data items. The pixel data items, thus selected, are stored into a RAM, and are supplied to the column electrodes, when necessary.

Dot-matrix display apparatus

An input device in use for electronic calculators with a segment type display section of a plurality of digits comprises a key switch matrix supplied with at least some of the signals applied to the segment of the display section, a latch circuit for detecting the key operation and latching the input signal representative thereof, a control section for detecting the required operation according to the input signal from the latch circuit for performing the required operation in accordance with the input signal and for producing a display signal, and a selector gate circuit which supplies the signal containing key-in detection pulse when the key operation is not detected to the segments and the key switch matrix, and sequentially supplies the key-in judging pulse to the key switches on the column lines of the key switch matrix when the key operation is detected.

Input device

Two different set voltages are respectively compared with a power source voltage. When the smaller set voltage which is close to a minimum operating voltage of an arithmetic circuit coincides with the power source voltage, a clock signal generator, and hence the arithmetic circuit are stopped. When the power source voltage increases to coincide with the larger set voltage after the clock signal generator is stopped, the clock signal generator and hence the arithmetic circuit are restarted.

Arithmetic operation apparatus using solar cells

When a mode changeover switch is shifted to musical instrument mode position and a key scale assigning key is operated, symbol '.music-sharp.' or 'b' is displayed on a display means according to the selected key scale. Numeral keys and a decimal point key are then operated to play a wide variety of musical tones on the selected key scale.

Growing community of inventors

Yokohama, Japan

Eiichi Munetsugu