Power Conservation for a Display Controller in Accordance with the State of Connection or of the Source Power Received by the Display Controller
First Claim
1. A computer comprising:
- a display for displaying an image;
detection means for detecting start and stop of supply of external power to said computer; and
display control means for controlling image display on said display, a display performance of said display control means being altered in accordance with a result of detection by said detection means.
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Accused Products
Abstract
A CPU determines if an expansion unit is docked or if there is external power supplied, in accordance with an SMI signal received. When a personal computer is docked to an expansion unit or when supply of external power is initiated, a process for switching the display mode to a high performance display mode for carrying out image display with the optimal display performance available from a display controller is started. When the personal computer is undocked from the expansion unit or when supply of external power is inhibited, a process for switching the display mode to a low power display mode set in the display controller is started. In those mode switching processes, power supply to a VRAM, the setting of a work area and a clock rate are changed.
74 Citations
13 Claims
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1. A computer comprising:
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a display for displaying an image;
detection means for detecting start and stop of supply of external power to said computer; and
display control means for controlling image display on said display, a display performance of said display control means being altered in accordance with a result of detection by said detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer connectable to an expansion unit, comprising:
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a display for displaying an image;
detection means for detecting docking and undocking said computer to and from said expansion unit; and
display control means for controlling image display on said display, a display performance of said display control means being altered in accordance with a result of detection by said detection means. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification