Fujitsu Semiconductor Limited

Fujitsu Corporation

Hideto Fukuda

Shinya Udo

Masao Kumagai

Osamu Kudo

Kenji Suzuki

Kenichi Ushiyama

Kenji Kumagai

Shigenori Ichinose

Shuji Tanahashi

Takafumi Miyahara

A design support method executed by a computer includes: detecting a layout position of a first terminal in a cell as a first layout position from layout data including a cell of a macro which is arranged at a plurality of orientations, the first terminal being arranged at a first orientation; calculating a second layout position of a first terminal which is arranged at a second orientation which is different from the first orientation based on a variation from the first orientation to the second orientation and the first layout position; associating the second layout position with the first layout position and the layout data; and outputting an association result.

Apparatus and method for design support using layout positions of first and second terminals

A lookup table includes a single via layer having 2via insertion portions corresponding to 2input patterns provided from N input terminals; and a via inserted into at least one of the via insertion portions, the via connecting the input terminal and an output terminal.

Lookup table, semiconductor integrated circuit, method for making lookup table and method for making semiconductor integrated circuit

A D/A converter for receiving a plurality of divisional voltages and converting a digital signal to an analog voltage with the divisional voltages, the D/A converter includes a selection circuit for receiving the divisional voltages and the digital signal to select one of the divisional voltages. The selection circuit includes a plurality of first switch circuits that are selectively activated in response to the digital signal to select one of the divisional voltages, with each of the first switch circuits being provided with a logic switch function and having an ON resistance when activated, and at least an activated one of the first switch circuits further dividing the selected one of the divisional voltages with the ON resistance. The plurality of switch circuits includes at least one voltage dividing switch circuit used to further divide the selected one of the divisional voltages.

D/A converter

A driver IC for a display that includes a first D/A converter with a 1selection circuit that receives 1image signals and supplies a selected positive divisional voltage to a 1operational amplifier, which supplies a positive pixel voltage by amplifying the selected positive divisional voltage; a 2D/A converter with a 2selection circuit that receives 2image signals and supplies a selected negative divisional voltage to a 2operational amplifier, which supplies a negative pixel voltage by amplifying the selected negative divisional voltage; and a polarity switching switch with 1and 2switches connecting the 1and 2D/A converters respectively, the polarity switching switch being switched to supply each of output terminals corresponding to the 1and 2image signals alternately with the positive and negative pixel voltages every horizontal scan period by activating/inactivating the 1and 2switches in a complementary manner.

Driver IC for display and display including same

A drive circuit of a display that decreases the number of gates in a selection circuit to reduce chip area. The drive circuit includes a first voltage dividing circuit for generating a plurality of divisional voltages by dividing a predetermined reference voltage. A selection circuit receives a selection signal and selects one of the divisional voltages. The selection circuit includes a plurality of first switch circuits selectively activated in response to the selection signal to select one of the divisional voltages. Each of the first switch circuits is provided with a logic switch function and has an ON resistance when activated. An activated one of the first switch circuits generates the pixel voltage by further dividing the selected one of the divisional voltages.

Method for driving display and drive circuit for display

An integrated circuit includes a first signal-inversion switching circuit which receives a signal supplied from an exterior thereof as a first input signal, followed by outputting the first input signal after logic inversion thereof in response to a first state of a switching signal and outputting the first input signal without logic inversion in response to a second state of the switching signal, a signal processing circuit which performs signal processing based on the output of the first signal-inversion switching circuit, and a second signal-inversion switching circuit which receives the output of the first signal-inversion switching circuit passing through the signal processing circuit as a second input signal, followed by outputting the second input signal after logic inversion thereof in response to the second state of the switching signal and outputting the second input signal without logic inversion in response to the first state of the switching signal.

Growing community of inventors

Kasugai, Japan

Hideto Fukuda