Apparatus and method for setting an ID code using a microcomputer in a display device
First Claim
1. For use in a cathode ray tube display connected to a computer system, an apparatus for setting an ID code comprising:
- video amplifier means for amplifying image information input from said computer system to display on a screen of said cathode ray tube display;
a key pad having an array of keys for generating a key input signal to compose an ID code;
memory means for storing ID code data input via said key pad by a user'"'"'s manipulation;
a microcomputer for controlling said display responsive to a result of a comparison between said ID code input via said key pad with said ID code data stored in said memory, and for receiving horizontal and vertical frequency signals from said computer system to control an operation of said display;
an on-screen circuit for converting a digital information signal synchronized with a train of clock pulses input from said microcomputer into an analog video signal having red, green and blue components; and
mixer means for mixing said analog video signal input from said on-screen circuit and a signal input from said video amplifier means.
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Accused Products
Abstract
An apparatus in a display system for setting an ID password includes a microprocessor, an input device and an output device. The input device incorporates an array of user manipulated keys so as to allow a user to input an ID code to the microprocessor. The microprocessor includes a program for comparing an inputted ID code with preset ID data stored in a memory to determine consistency therebetween. The microprocessor further includes a program for displaying information visually to a user and so as to allow only an authorized user to use the display thereby protecting private confidential information from misuse. A method for implementing the ID password system includes generally the steps of inputting an ID code via an input device, comparing an inputted ID code with a preset data stored in a memory and thereby controlling the display. As a result, a display employing an embodiment of the present invention may be used by an authorized user only.
48 Citations
22 Claims
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1. For use in a cathode ray tube display connected to a computer system, an apparatus for setting an ID code comprising:
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video amplifier means for amplifying image information input from said computer system to display on a screen of said cathode ray tube display; a key pad having an array of keys for generating a key input signal to compose an ID code; memory means for storing ID code data input via said key pad by a user'"'"'s manipulation; a microcomputer for controlling said display responsive to a result of a comparison between said ID code input via said key pad with said ID code data stored in said memory, and for receiving horizontal and vertical frequency signals from said computer system to control an operation of said display; an on-screen circuit for converting a digital information signal synchronized with a train of clock pulses input from said microcomputer into an analog video signal having red, green and blue components; and mixer means for mixing said analog video signal input from said on-screen circuit and a signal input from said video amplifier means. - View Dependent Claims (2)
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3. In cooperation with a computer system that provides analog computer image signals, a display system comprising:
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a video amplifier to amplify the analog computer image signals to provide amplified image signals; one of a first microcomputer circuit and a second microcomputer circuit, the first microcomputer circuit including a microcomputer coupled to the video amplifier to control the gain of the video amplifier, the second microcomputer circuit including the microcomputer coupled to analog switches that are coupled between the computer system and the video amplifier so that the microcomputer controls the connection state of the analog switches; an on-screen circuit to convert digital information signals from the microcomputer into analog on-screen image signals, the microcomputer being coupled to horizontal and vertical synchronizing signals from the computer system to synchronize the analog on-screen image signals with the analog computer image signals; a memory coupled to the microcomputer to store a stored ID code; a key pad coupled to the microcomputer to form a keyed ID code, the microcomputer determining when the stored ID code is unequal to the keyed ID code, the microcomputer setting one of (1) the gain of the video amplifier to be substantially zero and (2) a connection state of the analog switches to be in a disconnected state when the microcomputer determines that the stored ID code is unequal to the keyed ID code; and a mixer to provide CRT drive signals from a mix of the amplified image signals and the analog on-screen image signals. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In a display system that includes a microcomputer and a memory and a key pad and an on screen circuit and a video amplifier, the display system being associated with a computer system, a method comprising steps of:
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amplifying analog computer image signals from the computer system in the video amplifier to provide amplified image signals; converting digital information signals from the microcomputer into analog on-screen image signals in the on screen circuit, the microcomputer being coupled to horizontal and vertical synchronizing signals from the computer system to synchronize the analog on-screen image signals with the analog computer image signals; storing a stored ID code in the memory; forming a keyed ID code in the microcomputer from key pad inputs; determining in the microcomputer when the stored ID code is unequal to the keyed ID code; setting one of (1) the gain of the video amplifier to be substantially zero and (2) a connection state of analog switches coupled between the computer system and the video amplifier to be in a disconnected state when the microcomputer determines that the stored ID code is unequal to the keyed ID code; and mixing the amplified image signals and the analog on-screen image signals to provide CRT drive signals. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification