Sharp Kabushiki Kaisha Corporation

Takaaki Uno

Masaru Kuki

Toshimitsu Nakade

Yasuhiro Hirayama

Shinji Horino

Yukihiro Mizumoto

Hirotake Hayashi

A liquid crystal display system of the present invention includes: an operation processing apparatus having a digital-analog converter converting a digital video signal to an analog video signal based on predetermined time information and a synchronization combining circuit superimposing the predetermined time information on at least one of a horizontal synchronizing signal and a vertical synchronizing signal; and a liquid crystal display apparatus converting the analog video signal to a digital video signal based on the predetermined time information, thereby displaying an image based on the converted digital video signal.

Liquid crystal display system using a digital-to-analog converter

A computer peripheral device incorporating a multi-task control device which is extremely useful for such programs controlling the microcomputer system. In particular, the multi-task control device effectively controls a plurality of tasks executed by the CPU by using means other than the CPU including such means for controlling operations needed for comparing priority orders between a plurality of tasks, and the other means for generating interrupt operations from this control device against the CPU needed for switching tasks being executed in accordance with the result of the priority comparative operations.

Multi-task control device for central processor task execution control

In a microcomputer system, having independently programmed tasks and a master control processing unit (CPU), tasks can be switched independent of the master CPU through the use of a multi-task support processor which may, for example, be connected to the microcomputer system via an input/output (I/O) port. The multi-task support processor includes a memory for storing task control programs, a data memory and task control memory, a timer, a controller for controlling multi-task operations, and a master CPU interface element. Tasks including task control commands are stored in a memory for execution by the master CPU. The master CPU, upon encountering a task control command, sends that command to the multi-task support processor which becomes activated to control the switching and communications between the tasks under the direction of the received task control command, so that tasking control may be performed independent of the master CPU.

Growing community of inventors

Ikoma-gun, Japan

Takaaki Uno