Display control apparatus and method

A display control system which comprises a flat-panel display, and to which an analog color CRT display can be arbitrarily connected, each of said display being operable to display applied data, said display control system comprising:

• control signal generating means for generating various control signals including pixel video data and a display clock signal synchronous to the pixel video data;
• flat-panel control means for driving the flat-panel display according to said control signals;
• color palette memory means for color-converting the pixel video data supplied from said control signal generating means into a digital RGB signal;
• digital-to-analog converting means for converting the digital RGB signal supplied from said color palette memory means into an analog RGB signal in response to the display clock signal supplied from said control signal generating means to drive the analog color CRT display;
• and
• power-down control means for supplying a power-down signal to the digital-to-analog converting means in response to data indicating no use of the analog color CRT display, and for disabling the supply of said display clock signal after a preset number of the display clock signals required for completing a digital-to-analog conversion sequence are supplied to said digital-to-analog converting means.

A display control system which comprises a flat-panel display, and to which an analog color CRT display can be arbitrarily connected, each of said display being operable to display applied data, said display control system comprising:

• control signal generating means for generating various control signals including pixel video data and a display clock signal synchronous to the pixel video data;
• flat-panel control means for driving the flat-panel display according to said control signals;
• color palette memory means for color-converting the pixel video data supplied from said control signal generating means into a digital RGB signal;
• digital-to-analog converting means for converting the digital RGB signal supplied from said color palette memory means into an analog RGB signal in response to the display clock signal supplied from said control signal generating means to drive the analog color CRT display;
• and
• power-down control means for supplying a power-down signal to the digital-to-analog converting means in response to data indicating no use of the analog color CRT display, and for lowering the frequency of said display clock signal from that synchronous to the pixel video data after supplying a power-down signal to the digital-to-analog converting means.

A display control system which comprises a flat-panel display, and to which an analog color CRT display can be arbitrarily connected, each of said display being Operable to display applied data, said display control system comprising:

• control signal generating means for generating various control signals including pixel video data and a display clock signal synchronous to the pixel video data;
• flat-panel control means for driving the flat-panel display according to said control signals;
• color palette memory means for color-converting the pixel video data supplied from said control signal generating means into a digital RGB signal;
• digital-to-analog converting means for converting the digital RGB signal supplied from said color palette memory means into an analog RGB signal in response to the display clock signal supplied from said control signal generating means to drive the analog color CRT display;
• and
• power-down control means for supplying a power-down signal to said color palette memory means in response to data indicating a use of a monochrome display;
• wherein said flat-panel control means includes a means for tone-converting the pixel video data to a monochrome signal.

A display control method comprising steps of:

• generating various control signals including pixel video data and a display clock signal synchronous to the pixel video data;
• driving a flat-panel display according to said control signals;
• color-converting the pixel video data into a digital RGB signal by color palette memory means;
• converting the digital RGB signal supplied from said color palette memory means into an analog RGB signal in response to the display clock signal by a digital-to-analog converting means to drive an analog color CRT display;
• and
• supplying a power-down signal to said digital-to-analog converting means in response to data indicating no use of the CRT display, and performing a control of the display clock signal to complete a sequence of the digital-to-analog conversion which has been started at the time of supplying the power-down signal.