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US 5,629,715 AGranted
Display control system
AssigneeKabushiki Kaisha Toshiba
InventorHiroki Zenda
Life of this patent
Estimating the term…
Abstract
Circuits are provided for determining the use of a flat panel display such as a liquid crystal display or a plasma display based on a plurality of input conditions. A switch circuit is provided for cutting off the supply of display driving power to the flat panel display unit when the display unit is not in use. Gate circuits are provided for locking a LCD driving signal to a non-driven level when the non-use of the LCD is determined. A display controller controlling the display of a CRT display unit includes a display data conversion table and a plurality of D/A converters. A circuit is provided for inhibiting the supplement of clock pulses to a display data conversion table, when a display auto off is enabled. Circuits are provided for cutting off the reference current of the display signal output to the D/A converters.
Claims37
A display control system comprising:
- first display control means for driving a flat panel display unit using a specific display element, the flat panel display unit including at least a liquid crystal display (LCD) or a color panel;
- second display control means for driving a CRT display unit using a display element different from that of the flat panel display unit;
- means for generating at least one of a first signal indicating whether or not said CRT display unit is in use, a second signal indicating an enable or a disable state of said flat panel and said CRT display control means, a third signal indicating an enable or a disable state of said flat panel display unit, and a fourth signal indicating whether or not said flat panel display unit is in use;
- determining means for determining whether the flat panel display unit is in use according to at least one of the first through fourth signals;
- means for detecting which one of said LCD, and said color panel is connected to said display control system, the detecting means comprising a connector, and specified pins indicating types of flat panel display being assigned to said connector;
- means for supplying power to said flat panel display unit;
- and
- means for cutting off power for said flat panel display unit, when either the detecting means detects that the flat panel display is not connected to the display control system, or said determining means determines that the flat panel display unit is not in use.
5 more elements
A display control system comprising:
- a RAMDAC comprised of a digital/analog (D/A) converter and a display data conversion table for generating analog display data;
- first display control means for driving a flat panel display using a specific display element;
- means for storing set data relating the drive of said flat panel display, the set data including a signal indicating either an enable or a disable condition of the RAMDAC;
- second display control means for driving a CRT display using a display element different from that of the flat panel display, the second display control means controlling the CRT display using the RAMDAC;
- means for supplying power to the D/A converter and a drive clock to the display data conversion table;
- and
- means for cutting off a reference current of display signal output of said D/A converter and inhibiting supply of the drive clock to the display data conversion table, when the set data stored in the storing means indicates a disable condition.
4 more elements
A display control system comprising:
- first display control means, including a display data conversion table, for driving a flat panel display using a specified display element;
- second display control means for driving a CRT display using a display element different from that of said flat panel display;
- means for storing set data relating to the driving of said flat panel display, the set data including a signal indicating either an enable or a disable of condition of said display data conversion table;
- means for supplying a drive clock to said display data conversion table;
- and
- means for inhibiting supply of the drive clock to said display data conversion table of said first display control means when the set data stored in the storing means indicates a disable of condition.
3 more elements
A display control system comprising:
- first display control means including a display data conversion table and a digital/analog (D/A) converter, for driving a flat panel display using a specific display element;
- second display control means for driving a CRT display using a display element different from that of said flat panel display;
- determining means for determining whether said flat panel display is in use;
- means for supplying power to said flat panel display and CRT display;
- means for cutting off power to be supplied to said flat panel display when said determining means determines that said flat panel display is not in use;
- means for storing set data related to the driving of said flat panel display;
- means for supplying a clock pulse to said display data conversion table;
- means for supplying power to said digital/analog (D/A) converter;
- means for supplying a display drive signal to said flat panel display;
- means for cutting off the power supply to said D/A converter and the supply of the clock pulse to said display data conversion table when said set data indicates a specific condition;
- and
- means for locking the display drive signal to a non-driven level when said determining means determines that said flap panel display is not in use.
9 more elements
A display control system comprising:
- flat panel display control means for driving a flat panel display unit using a specific display element;
- CRT display control means for driving a CRT display unit using a display element different from that of said flat panel display unit;
- storage means for storing an enable or a disable state of the fiat panel display unit, the enable or disable state of said flat panel display unit being set in a setup process;
- means for generating at least one of a first signal indicating whether or not said CRT display unit is in use, a second signal indicating an enable or disable state of said flat panel display control means and said CRT display control means, a third signal indicating an enable or a disable state of said flat panel display unit, and fourth signal indicating whether or not said flat panel display unit is in use;
- determining means for determining the enable or disable state of the flat panel, display unit in accordance with the enable or the disable state stored in said storage means, and for determining a non-use state of said fiat panel display unit when said generating means generates at least one of the first signal indicating the non-use of said CRT display unit, the second signal indicating the disable state of said flat panel display control means, the third signal indicating the disable state of said flat panel display unit, the fourth signal indicating the non-use of said flat panel display unit;
- and
- means for cutting off power supplied to said flat panel display unit when said determining means determines the disable state or the non-use state of the flat panel display unit according to at least one of the first through fourth signals.
4 more elements
The system according to claim 28, wherein said flat panel display is a liquid crystal display.
Dependencies are inferred from the claim text.