EP0371383A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Power and signal supply control device
Assignee: Toshiba Corp
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Filing: 1989-11-21
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Granted: —
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Expires: 2009-11-21
Abstract
Abstract In a laptop computer normally equipped with a removable flat panel display (2) and having the option of being equipped with an external display (3), the removal of the flat panel display (2) is detected when it is removed, thereby disabling the supply of power, control signals and data to the display (2). The supply of power, control signals and data to the display (2) is not started unless the removable display (2) is connected to the main system (1) and a reset signal is generated by means of a power switch of the system or a reset switch (16). When the display (2) is being connected to the main system (1), therefore, the supply of power, control signals and data to the display (2) is disabled without fail.
Inventors
- 👤 Akifumi Intellectual Property Division Inoue
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:19
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/16; G06F1/1613; G06F1/1633; G06F1/1637; G06F1/1654; G06F1/24; G06F1/26
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
In a computer system which is equipped with a first display (2) connectable to and disconnectable from a main system (1) and can be further equipped with a second display (3), a device for controlling the supply of power and signals to said first display characterized by comprising: detecting means (10) for detecting whether said first display (2) is connected to said main system (1) or not; supply instructing means (11) responsive to said detecting means and a reset signal applied thereto for generating a instruction signal for instructing the supply of power and signals to said first display; power control means (12) responsive to the instruction signal for controlling the supply of power to said first display; and signal controlling means (13) responsive to the instruction signal for controlling the supply of the signals to said first display.
Claim 2
Dependent Claim
139 words
In a computer system which is equipped with a first display (2) connectable to and disconnectable from a main system (1) and can be further equipped with a second display (3), a device for controlling the supply of power and signals to said first display characterized by comprising: detecting means (10) for detecting whether said first display (2) is connected to said main system (1) or not; supply instructing means (11) responsive to said detecting means and a reset signal applied thereto for generating a instruction signal for instructing the supply of power and signals to said first display; power control means (12) responsive to the instruction signal for controlling the supply of power to said first display; and signal controlling means (13) responsive to the instruction signal for controlling the supply of the signals to said first display.
Claim 3
Dependent Claim
16 words
A device according to claim 1, characterized in that said display is a flat panel display.
Claim 4
Dependent Claim
20 words
A device according to claim 1, characterized in that said main system is a main system of a laptop computer.
Claim 5
Dependent Claim
18 words
A device according to claim 2, characterized in that said flat panel display comprises a liquid crystal display.
Claim 6
Dependent Claim
18 words
A device according to claim 2, characterized in that said flat panel display comprises a plasma display panel.
Claim 7
Dependent Claim
17 words
A device according to claim 1, characterized in that said supply instructing means includes a flip-flop circuit.
Claim 8
Dependent Claim
64 words
A device according to claim 1, characterized in that said detecting means includes a signal line connecting an input of said supply instructing means to a signal ground of said main system via said display, and a pull-up resistor having one end connected to a power supply of said main system and the other end connected to said input of said supply instructing means.
Claim 9
Dependent Claim
76 words
A device according to claim 1, characterized in that in which said detecting means includes a switch having one end connected to a signal ground of said main system and the other end connected to an end of a pull-up resistor the other end of which is connected to a power supply of said main system, said switch being switched in response to connection and disconnection of said display to and from said main system respectively.
Claim 10
Dependent Claim
17 words
A device according to claim 1, characterized in that the reset signal includes a system reset signal.
Claim 11
Dependent Claim
27 words
A device according to claim 1, characterized in that the reset signal signal includes a display start signal for designating a start of display on said display.
Claim 12
Dependent Claim
24 words
A device according to claim 10, characterized in that the display start signal is produced by executing a predetermined program in said main system.
Claim 13
Dependent Claim
129 words
In a computer system which has a main system and is equipped with a first display (2) connectable to and disconnectable from a main system (1) and can be further equipped with a second display (3), a method of controlling the supply of power and signals to said first display comprising the steps of: detecting whether said first display is connected to said main system or not; producing an instruction signal for instructing the supply of power and signals to said first display in response to an output produced by said detecting step and an input reset signal; controlling the supply of power to said first display in response to said instruction signal; and controlling the supply of signals to said first display in response to the instruction signal.
Claim 14
Dependent Claim
129 words
In a computer system which has a main system and is equipped with a first display (2) connectable to and disconnectable from a main system (1) and can be further equipped with a second display (3), a method of controlling the supply of power and signals to said first display comprising the steps of: detecting whether said first display is connected to said main system or not; producing an instruction signal for instructing the supply of power and signals to said first display in response to an output produced by said detecting step and an input reset signal; controlling the supply of power to said first display in response to said instruction signal; and controlling the supply of signals to said first display in response to the instruction signal.
References Cited (Backward Citations)
No citation records indexed.
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