Nanao Corporation

Hajime Torii

Tadahiko Hiraka

Yuichi Komatsu

Katsuhisa Takase

Kazuhiro Konishi

Hideo Katada

Toshihisa Tanabe

When a &ldquo;screen saver&rdquo; operates to display a homogeneous black picture image after the same image is continuously displayed on a CRT for a predetermined period of time, a power supply for a CRT display unit is controlled to be turned off, thereby preventing the CRT display unit from being left for a long time in a power-on state. Namely, a waiting time of 3 minutes, for example, is provided when the &ldquo;screen saver&rdquo; operates so that the CRT displays a homogeneous black picture image to turn off a power circuit for the CRT, and then a heater for the CRT is turned off after a lapse of a predetermined period of time of 5 to 60 minutes, for example. An extension graphics board, which is inserted in an open slot provided in a computer of an open architecture type may be provided to perform this function. The extension graphics board has an input detection part including a keyboard access detection part for detecting an address signal which is supplied to an address bus in response to manipulation of a keyboard, and an interruption request detection part for detecting an interruption signal which is output in response to manipulation of a mouse. A timer is reset when the input detection part detects the presence of an input signal received from the keyboard or the mouse. When no reset signal is supplied from the input detection part again before a lapse of a period of time which is previously set in the timer, a blank signal is supplied to the CRT display unit.

CRT display unit and power supply control method therefor

Directed to an adjustment system for adjusting image quality of a video monitor by using a microprocessor, the present invention simplifies complicated operation in image quality adjustment and thereby eliminates the need for high-level operating skills. The adjustment system comprises an on-screen display controller circuit which can display a plurality of adjustment items in the form of icons together with a visual message, explaining the content of each icon, on a screen of the video monitor and an input device used for selecting a desired icon and setting a corresponding parameter, the input device being constructed of four-way input switches which are integrally combined into a single button to perform adjustment functions. This construction enables an operator to perform adjustment operations in an integrated manner which have thus far been made individually, providing savings in the period of time required for adjustment work and simplification thereof.

Video monitor adjustment system

Growing community of inventors

Ishikawa, Japan

Hajime Torii